USA Standard Gear Ring & Pinion Gears, Axles, Driveshafts & More

USA Standard Gear uses precision machining and vigorous testing methods to produce a large assortment of world-class gearing and axle products, ranging from axle shafts...

USA Standard Gear uses precision machining and vigorous testing methods to produce a large assortment of world-class gearing and axle products, ranging from axle shafts to lockers. Summit Racing is your go-to source for USA Standard Gear parts. We carry USA Standard Spartan lockers, ring and pinion sets, axle shafts, replacement cross pins, front axle stubs, and more. Get the traction you need from the parts you want. Order your USA Standard Gear parts from Summit Racing today!

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USA Standard Gear Spartan Lockers Dana 30 SL D30-27

Spartan Differential Locker, Dana 30, 27-spline Axle, Jeep, Ford, International, Each

Part Number: SPZ-17000

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

USA Standard Gear Posi 30 Spline Differential Carriers Chrysler 8.75 Inch ZP PC8.75-SMTH

Differential Carrier, Power Lok, Positraction, Smooth Design, Chrysler 8.75 in., Rear, Steel, 41, 42, 89 Housings, Chrysler, Plymouth, Dodge, Each

Part Number: SPZ-59027

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Limited Slip 27 Spline Differential Dana 30 SL D30-4-27-LSD

Differential Carrier, Spartan Helical Gear Limited Slip, Dana 30, Front, 27 Spline, 3.73 and Up Ratio, Each

Part Number: SPZ-10383

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

USA Standard Gear Posi 31 Spline Differential Carriers GM 8.5 Inch, O axle ZP PGM8.5O-3-31

Differential Carrier, Limited Slip, 31-Spline Axle, Oldsmobile, 8.5 in., Each

Part Number: SPZ-59006

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Need It Sooner? We recommend these similar substitute parts:

Yukon Gear & Axle Dura Grip Positraction Carriers GM 8.5 Inch, O axle YDGGM8.5O-3-28

5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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USA Standard Gear Spartan Lockers GM 8.875 Inch (12-bolt), truck SL GM12-30

Differential Carrier, Spartan Locker, 30-spline, Steel, Rear, GM 8.875 in., Each

Part Number: SPZ-17032

4.0 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

USA Standard Gear Spartan Lockers GM 8.5 Inch SL GM8.5-30

Differential Carrier, Spartan Locker, Steel, 30-spline, Rear, GM 8.5 in., Each

Part Number: SPZ-17041

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Toyota 9.5 Inch SL TLC-30

Spartan Differential Locker, Toyota 9.5 in., 30-spline Axle, Toyota, Each

Part Number: SPZ-17033

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Chrysler 8.25 Inch SL C8.25-29

Spartan Differential Locker, Chrysler 8.25 in., 29-spline Axle, Chrysler, Dodge, Jeep, Plymouth, Each

Part Number: SPZ-17038

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

USA Standard Gear Spartan Lockers Dana 44 SL D44HD-30

Differential Carrier, Spartan Locker, Steel, 10-bolt, 30-spline, Rear, Dana 44, Jeep, Each

Part Number: SPZ-17002

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Dana 60 SL D60-30

Differential Carrier, Spartan Locker, Steel, 10-bolt, 30-spline, Rear, Dana 60, Chevy, Dodge, Ford, Jeep, Each

Part Number: SPZ-17003

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Toyota 8.0 (7.8) Inch SL T8-30

Spartan Differential Locker, Toyota, 8.0 in., 30-spline Axle, Rear, Each

Part Number: SPZ-17015

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers AMC Model 20 SL M20-29

Differential Carrier, Spartan Locker, Steel, 12-bolt, 29-spline, Rear, AMC Model 20, AMC, Hummer, Jeep, Each

Part Number: SPZ-17006

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Dana 35 SL M35-1.6-27

Spartan Differential Locker, Dana 35, 27-spline Axle, Jeep, 1.625 in. Carrier, Each

Part Number: SPZ-17008

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Need It Sooner? We recommend these similar substitute parts:

Powertrax Lock-Right Lockers Dana 35 2311-LR

3 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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USA Standard Gear Spartan Lockers Toyota V6 SL TV6-30

Spartan Differential Locker, Toyota, 30-spline Axle, Toyota, V6, Each

Part Number: SPZ-17034

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Toyota 7.5 Inch SL T7.5-27

Spartan Differential Locker, Toyota 7.5 in., 27-spline Axle, Toyota, Each

Part Number: SPZ-17014

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Ford 8/9 Inch SL F9-28-31

Differential Carrier, Spartan Locker, Steel, 28/31-spline, Open Case, Rear, Ford 8/9 in., Each

Part Number: SPZ-17042

2.67 out of 5 stars ( 3 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Chrysler 8.25 Inch SL C8.25-27

Differential Carrier, Spartan Locker, Steel, 27-spline, Rear, Chrysler 8.25 in., Each

Part Number: SPZ-17037

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Dana 30/M186, Jeep Wrangler JL SL D30JL-27

Spartan Locker for Dana 30 JL M186 Differential

Part Number: SPZ-17046

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Suzuki 6.9 Inch SL SUZSAM

Spartan Differential Locker, Suzuki 6.9 in., 26-spline Axle, Suzuki, Each

Part Number: SPZ-17013

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 30, 2025 if ordered today

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Estimated Ship Date: Dec 30, 2025 if ordered today

USA Standard Gear Spartan Lockers Nissan H233B SL NPATROL-31

Differential Carrier, Spartan Locker, Steel, 31-spline, Rear, for Nissan H233B, Each

Part Number: SPZ-17036

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Spartan Lockers Dana 44 SL D44-19

D44 19spl SPARTAN LOCKER

Part Number: SPZ-17043

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Differential Carriers ZP PC8.75-AGRS

8.75" Chrysler RACE Power Lok POSI , COMPLETE - SURE GRIP .

Part Number: SPZ-59026

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear - Differential Carriers for 1961-1969 PATROL - SL XP-NPATROL

for Nissan PATROL SPARTAN LOCKER X/PIN SHAFT

Part Number: SPZ-17039

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Ring and Pinion Gear and Differential Combos ZGK2018

Ring and Pinion Gears,USA Standard 8.6" GM, 4.11 Ratio Rear Ring & Pinion Gea

Part Number: SPZ-10729

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

USA Standard Gear Differential Carrier Replacement Parts SL SPRING-LRG

Pin and Spring Kit, Differential Carrier Replacement Component, Rear, Dana 60, Kit

Part Number: SPZ-17010

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

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