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Front or Rear RotoPAX/USA Standard Gear Front or Rear
Front or Rear RotoPAX/USA Standard Gear On Sale
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USA Standard Gear Differential Master Overhaul Kits
USA Standard Gear Differential Master Overhaul KitsFrom $191.89
From $191.89
USA Standard Gear Spools
USA Standard Gear SpoolsFrom $120.89
- Available for different makes and models
- Available different spline count
- 5 year manufacturer warranty
From $120.89
USA Standard Gear Axle Shafts
USA Standard Axle ShaftsFrom $1,337.89
- Available in different sizes
- With or without ABS ring
- 5 year warranty against manufacturer defects
From $1,337.89
40 Products
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USA Standard Toyota 7.5" IFS Master Overhaul Kit - ZKT7.5-4CYL
- Fitment: Universal Fit
- Toyota 7.5" 4 cylinder engine
- Standard rotation
- Uses Koyo bearings and races
- Included in this kit are carrier bearings and races, pinion bearings and races, pinion seal, axle seals, pinion shim kit, ring gear bolts, pinion nut, crush sleeve , oil baffles and slingers , thread locker, marking compound with brush, and silicone
- 1 year warranty against manufacturer defects
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$317.89
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$317.89
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- Fitment: Universal Fit
- Toyota 7.5" 4 cylinder engine
- Standard rotation
- Uses Koyo bearings and races
- Included in this kit are carrier bearings and races, pinion bearings and races, pinion seal, axle seals, pinion shim kit, ring gear bolts, pinion nut, crush sleeve , oil baffles and slingers , thread locker, marking compound with brush, and silicone
- 1 year warranty against manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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USA Standard Toyota 7.5" IFS T100 Master Overhaul Kit - ZKT7.5-REV
- Fitment: Universal Fit
- Toyota 7.5"
- Reverse rotation
- Uses Koyo bearings and races
- Included in this kit are carrier bearings and races, pinion bearings and races, pinion seal, axle seals, pinion shim kit, ring gear bolts, pinion nut, crush sleeve , oil baffles and slingers , thread locker, marking compound with brush, and silicone
- 1 year warranty against manufacturer defects
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$392.89
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$392.89
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- Fitment: Universal Fit
- Toyota 7.5"
- Reverse rotation
- Uses Koyo bearings and races
- Included in this kit are carrier bearings and races, pinion bearings and races, pinion seal, axle seals, pinion shim kit, ring gear bolts, pinion nut, crush sleeve , oil baffles and slingers , thread locker, marking compound with brush, and silicone
- 1 year warranty against manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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USA Standard 7.5" IFS V6 Master Overhaul Kit - ZKT7.5-V6
- Fitment: Universal Fit
- Toyota 7.5"
- Reverse rotation
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound with brush and silicone
- 1 year warranty against manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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$394.89
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$394.89
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- Fitment: Universal Fit
- Toyota 7.5"
- Reverse rotation
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound with brush and silicone
- 1 year warranty against manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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USA Standard Toyota 8" Master Overhaul Kit - ZKT8-B
- Fitment: Universal Fit
- Toyota 8" and 4 cylinder engine
- 86-newer with OEM ring and pinion set
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound with brush and gasket
- 1 year warranty against Manufacturer defects
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$257.89
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$257.89
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- Fitment: Universal Fit
- Toyota 8" and 4 cylinder engine
- 86-newer with OEM ring and pinion set
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound with brush and gasket
- 1 year warranty against Manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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USA Standard Toyota Master Overhaul Kit - ZKTLC-A
- Fitment: Universal Fit
- 90-older Toyota Landcruiser
- 10 & 30 spline
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, pinion nut, crush sleeve, thread locker, marking compound with brush and silicone
- 1 year warranty against manufacturer defects
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$355.89
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$355.89
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- Fitment: Universal Fit
- 90-older Toyota Landcruiser
- 10 & 30 spline
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, pinion nut, crush sleeve, thread locker, marking compound with brush and silicone
- 1 year warranty against manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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USA Standard Toyota Master Overhaul Kit - ZKTLC-B
- Fitment: Universal Fit
- 91-newer Toyota Landcruiser
- 30 spline
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, pinion nut, crush sleeve, thread locker, marking compound with brush and silicone
- 1 year warranty against manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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$397.89
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$397.89
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- Fitment: Universal Fit
- 91-newer Toyota Landcruiser
- 30 spline
- Uses Koyo bearings and races
- Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, pinion nut, crush sleeve, thread locker, marking compound with brush and silicone
- 1 year warranty against manufacturer defects
- California Residents: WARNING + View More Specs - View Less Specs
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We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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Part Number: UZGZPFSD44-3-30DN
USA Standard Dana 44 30 Spline 3.73 Down Spool - ZPFSD44-3-30DN
- Fitment: Universal Fit
- Chrysler Dana Spicer 44 with 30 spline axles
- Dana 44 front or rear axles
- 3.73 & down ratio only
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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$278.89
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$278.89
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- Fitment: Universal Fit
- Chrysler Dana Spicer 44 with 30 spline axles
- Dana 44 front or rear axles
- 3.73 & down ratio only
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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Part Number: UZGZPFSD44-4-30UP
USA Standard Steel Spool for Dana 44 - ZPFSD44-4-30UP
- Fitment: Universal Fit
- Chrysler Dana Spicer 44 with 30 spline axles
- Dana 44 front or rear axles
- 3.92 & up ratio only
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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$266.89
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$266.89
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- Fitment: Universal Fit
- Chrysler Dana Spicer 44 with 30 spline axles
- Dana 44 front or rear axles
- 3.92 & up ratio only
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
Lowest Price! Guaranteed! Request A Price Match
4WP PROTECTION PLAN
Our Protection Plan covers your investment above and beyond the manufacturer's coverage. For only 10% more, if your item is damaged, fails or malfunctions, we'll replace it for free!
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USA Standard Dana 60 30 Spline 4.10 Down Spool - ZPFSD60-3-30
- Fitment: Universal Fit
- Dana 60 with 30 spline axles
- Dana 60 front or rear axles
- 4.10 & down ratio only
- High-quality 8620 steel
- California Residents: WARNING + View More Specs - View Less Specs
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$479.89
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$479.89
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- Fitment: Universal Fit
- Dana 60 with 30 spline axles
- Dana 60 front or rear axles
- 4.10 & down ratio only
- High-quality 8620 steel
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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Our Protection Plan covers your investment above and beyond the manufacturer's coverage. For only 10% more, if your item is damaged, fails or malfunctions, we'll replace it for free!
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USA Standard Dana 60 35 Spline 4.10 Down Spool - ZPFSD60-3-35
- Fitment: Universal Fit
- Chrysler Dana Spicer 60 with 35 spline axles
- 4.10 and down ratio only
- Dana 60 front or rear axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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$428.89
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$428.89
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- Fitment: Universal Fit
- Chrysler Dana Spicer 60 with 35 spline axles
- 4.10 and down ratio only
- Dana 60 front or rear axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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4WP PROTECTION PLAN
Our Protection Plan covers your investment above and beyond the manufacturer's coverage. For only 10% more, if your item is damaged, fails or malfunctions, we'll replace it for free!
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USA Standard Dana 60 30 Spline 4.56 Up Spool - ZPFSD60-4-30
- Fitment: Universal Fit
- Chrysler Dana Spicer 60 with 30 spline axles
- 4.56 and up ratio only
- Dana 60 front or rear axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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$428.89
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$428.89
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- Fitment: Universal Fit
- Chrysler Dana Spicer 60 with 30 spline axles
- 4.56 and up ratio only
- Dana 60 front or rear axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
Lowest Price! Guaranteed! Request A Price Match
4WP PROTECTION PLAN
Our Protection Plan covers your investment above and beyond the manufacturer's coverage. For only 10% more, if your item is damaged, fails or malfunctions, we'll replace it for free!
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USA Standard Steel Spool for Chrysler Dana 60 - ZPFSD60-4-35
- Fitment: Universal Fit
- Chrysler Dana Spicer 60 with 35 spline axles
- 4.56 and up ratio only
- Dana 60 front or rear axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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$428.89
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$428.89
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- Fitment: Universal Fit
- Chrysler Dana Spicer 60 with 35 spline axles
- 4.56 and up ratio only
- Dana 60 front or rear axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
Lowest Price! Guaranteed! Request A Price Match
4WP PROTECTION PLAN
Our Protection Plan covers your investment above and beyond the manufacturer's coverage. For only 10% more, if your item is damaged, fails or malfunctions, we'll replace it for free!
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USA Standard Ford 9" 28 Spline Spool - ZPFSF9-28
- Fitment: Universal Fit
- Ford 9" with 28 spline axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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$128.02
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$128.02
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- Fitment: Universal Fit
- Ford 9" with 28 spline axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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4WP PROTECTION PLAN
Our Protection Plan covers your investment above and beyond the manufacturer's coverage. For only 10% more, if your item is damaged, fails or malfunctions, we'll replace it for free!
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USA Standard Ford 9" 35 Spline Spool - ZPFSF9-35
- Fitment: Universal Fit
- Ford 9" with 35 spline axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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$265.89
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$265.89
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- Fitment: Universal Fit
- Ford 9" with 35 spline axles
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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Our Protection Plan covers your investment above and beyond the manufacturer's coverage. For only 10% more, if your item is damaged, fails or malfunctions, we'll replace it for free!
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USA Standard AMC Model 20 29 Spline 3.08 Up Spool - ZPFSM20-3-29
- Fitment: Universal Fit
- AMC Model 20
- 3.08 and up ratio only
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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- Fitment: Universal Fit
- AMC Model 20
- 3.08 and up ratio only
- High-quality 8620 steel
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
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USA Standard Toyota 8" 30 Spline Spool - ZPFST8-30
- Fitment: Universal Fit
- Toyota 8" with 4 cylinder engine
- 30 spline
- High-quality 8620 all steel construction
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- Fitment: Universal Fit
- Toyota 8" with 4 cylinder engine
- 30 spline
- High-quality 8620 all steel construction
- California Residents: WARNING + View More Specs - View Less Specs
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USA Standard Dana 44 30 Spline Mini Spool - ZPMINSD44-30
- Fitment: Universal Fit
- Dana Spicer 44 with 30 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
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$132.89
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- Fitment: Universal Fit
- Dana Spicer 44 with 30 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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USA Standard Ford 9" 28 Spline Mini Spool - ZPMINSF9-28
- Fitment: Universal Fit
- Ford 9" 28 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
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$47.89
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- Fitment: Universal Fit
- Ford 9" 28 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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USA Standard Ford 9" 31 Spline Mini Spool - ZPMINSF9-31
- Fitment: Universal Fit
- Ford 9" 31 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
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$46.89
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- Fitment: Universal Fit
- Ford 9" 31 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- California Residents: WARNING + View More Specs - View Less Specs
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Part Number: UZGZPMINSGM8.2-28
USA Standard GM 8.2" Mini Spool - ZPMINSGM8.2-28
- Fitment: Universal Fit
- GM 8.2"
- Provides 100% traction to both wheels at all times
- Installs into standard open carrier case
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- Fitment: Universal Fit
- GM 8.2"
- Provides 100% traction to both wheels at all times
- Installs into standard open carrier case
- California Residents: WARNING + View More Specs - View Less Specs
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Part Number: UZGZPMINSGM8.5-28
USA Standard GM 8.5" 28 Spline Mini Spool - ZPMINSGM8.5-28
- Fitment: Universal Fit
- GM 8.5" with 28 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- Mini spool
- California Residents: WARNING + View More Specs - View Less Specs
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- Fitment: Universal Fit
- GM 8.5" with 28 spline axles
- Installs into a standard open carrier case
- Provides 100% traction to both wheels at all times
- Not recommended for street driven vehicles
- Mini spool
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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USA Standard Dana 44 Spartan Locker with HD Cross Pin Shaft - SLD44HD-30
- Fitment: Universal Fit
- 96-04 Jeep Grand Cherokee
- Fits Dana Spicer 44HD with 30 spline axles
- Made from 9310 steel for added strength
- Replaces the spiders in a standard carrier case
- Ratio 2.00
- EndRatio 8.00
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$637.89
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$637.89
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- Fitment: Universal Fit
- 96-04 Jeep Grand Cherokee
- Fits Dana Spicer 44HD with 30 spline axles
- Made from 9310 steel for added strength
- Replaces the spiders in a standard carrier case
- Ratio 2.00
- EndRatio 8.00
- California Residents: WARNING + View More Specs - View Less Specs
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Part Number: UZGSLSPRING-F9-TV6
USA Standard Spartan Spring & Pin Kit - SLSPRING-F9-TV6
- Fitment: Universal Fit
- Ford 9", 28 & 31 Spline
- Toyota 8" V6 rear
- Designed and engineered for off road performance
- Chromoly drivers for added strength
- Heat treated and precision cut teeth
- Spartan Locker is the toughest lunchbox locker on the market
- California Residents: WARNING + View More Specs - View Less Specs
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$32.89
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- Fitment: Universal Fit
- Ford 9", 28 & 31 Spline
- Toyota 8" V6 rear
- Designed and engineered for off road performance
- Chromoly drivers for added strength
- Heat treated and precision cut teeth
- Spartan Locker is the toughest lunchbox locker on the market
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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USA Standard Axle Shaft for 97-99 Ford Expedition Left Hand Side - ZAF880032
- Fitment: Universal Fit
- 5 x 135mm bolt pattern
- Double drilled with .563" & .606" stud holes
- 31 spline
- 5 lug
- 1.705" bearing journal
- 33.5" long
- Fits Ford 8.8" in 1997-1999 Expedition
- California Residents: WARNING + View More Specs - View Less Specs
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$172.89
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- Fitment: Universal Fit
- 5 x 135mm bolt pattern
- Double drilled with .563" & .606" stud holes
- 31 spline
- 5 lug
- 1.705" bearing journal
- 33.5" long
- Fits Ford 8.8" in 1997-1999 Expedition
- California Residents: WARNING + View More Specs - View Less Specs
PROMOTIONS AUTOMATICALLY APPLIED
We Pay the Sales Tax - 4th Of July Sale Weekend At 4WP!
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