Full Spools and Mini Spools

You don’t want to be a one-tire fryer at the track, and welds can weaken your axles—full spools and mini spools are the stronger way to lock your axles together...

You don’t want to be a one-tire fryer at the track, and welds can weaken your axles—full spools and mini spools are the stronger way to lock your axles together for maximum traction!

Spools (also called full spools) replace your differential carrier and lock the left and right axles together. There are no moving parts, they add support to the ring gear, and they can save unsprung weight.

Mini spools fit inside an existing open differential, replacing the side and spider gears. They’re usually less expensive, but aren’t as strong as full spools.

Top Brands

For maximum traction, shop for spools and...

You don’t want to be a one-tire fryer at the track, and welds can weaken your axles—full spools and mini spools are the stronger way to lock your axles together for maximum traction!

Mini spools fit inside an existing open differential, replacing the side and spider gears. They’re usually less expensive, but aren’t as strong as full spools.

Top Brands

For maximum traction, shop for spools and mini spools at Summit Racing Equipment—find your axle size below. Summit carries trusted name brands like Strange Engineering, Yukon Gear, Dana Spicer, Motive Gear, Moser, Allstar, and more.

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Results 1 - 23 of 23

Moser Engineering Full Spools 5S9F40

Spool, Full Size, Steel, 40-Spline, 10-Bolt, Ford 9 in., Each

Part Number: MSR-5S9F40

3.67 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Moser Engineering Full Spools 5S12333

Spool, Full Size, Steel, 33-Spline, 3 Series, 12-Bolt, GM 8.875 in., Passenger Car, Each

Part Number: MSR-5S1233-3

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Moser Engineering Full Spools 5S8831

Spool, Full Size, Steel, 31-Spline, 10-Bolt, Ford 8.8 in., Each

Part Number: MSR-5S8831

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S9F35

Spool, Full Size, Steel, 35-Spline, 10-Bolt, Ford 9 in., Each

Part Number: MSR-5S9F35

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Moser Engineering Full Spools 5S8833

Spool, Full Size, Steel, 33-Spline, 10-Bolt, Ford 8.8 in., Each

Part Number: MSR-5S8833

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S9F33

Spool, Full Size, Steel, 33-Spline, 10-Bolt, Ford 9 in., Each

Part Number: MSR-5S9F33

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S12334

Spool, Full Size, Steel, 33-Spline, 4 Series, 12-Bolt, GM 8.875 in., Passenger Car, Each

Part Number: MSR-5S12334

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S1030

Spool, Full Size, Steel, 30-Spline, 10-Bolt, GM 8.5 in., Each

Part Number: MSR-5S1030

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5SD404

Spool, Full Size, Steel, 40-Spline, 10-Bolt, Dana 60, Each

Part Number: MSR-5SD404

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S9F40P

Spool, Full, Steel, 40-spline, Fits A 3.250 in. Case Only, Ford 9 in., Each

Part Number: MSR-5S9F40P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S12333T

Spool, Full Size, Steel, 33-Spline, 3 Series, 12-Bolt, GM 8.875 in., Truck, Each

Part Number: MSR-5S12333T

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S12354

Spool, Full Size, Steel, 35-Spline, 4 Series, 12-Bolt, GM 8.875 in., Each

Part Number: MSR-5S12354

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5SD353

Spool, Full Size, Steel, 35-Spline, 10-Bolt, Dana 60, Each

Part Number: MSR-5SD353

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Profiled Spools 5S9F35P

Spool, Full, Profiled and Lightened, Steel, 35-spline, 3.250 in. Case, Ford 9 in., Each

Part Number: MSR-5S9F35P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S12353

Spool, Full Size, Steel, 35-Spline, 3-Series, GM, 12-Bolt Passenger Car, Each

Part Number: MSR-5S12353

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5SD354

Spool, Full Size, Steel, 35-Spline, 10-Bolt, Dana 60, Each

Part Number: MSR-5SD354

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S9F35A

Spool, Full Size, Aluminum, 35-Spline, 10-Bolt, Ford 9 in., Each

Part Number: MSR-5S9F35A

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S9F31

Spool, Full Size, Steel, 31-Spline, 10-Bolt, Ford 9 in., Each

Part Number: MSR-5S9F31

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S1230

Spool, Full Size, Steel, 30-Spline, 4 Series, 12-Bolt, GM 8.875 in., Each

Part Number: MSR-5S1230

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S1033

Spool, Full Size, Steel, 33-Spline, 10-Bolt, GM 8.5 in., Each

Part Number: MSR-5S1033

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S8835

Spool, Full Size, Steel, 35-Spline, 10-Bolt, Ford 8.8 in., Each

Part Number: MSR-5S8835

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S1233A

Spool, Full Size, Aluminum, 33-Spline, 4 Series, 12-Bolt, GM 8.875 in., Passenger Car, Each

Part Number: MSR-5S1233A

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Full Spools 5S87535

Spool, Full Size, Steel, 35-Spline, Chrysler 8.75 in., Each

Part Number: MSR-5S87535

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

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