Product Summary

GM 8.875 Inch 12-Bolt Car, Full Spool Type, Steel

  • Discontinued
  • Item is new and in unused condition. This product will no longer be stocked by Speedway Motors
  • This is a steel full spool made from 4130 aircraft alloy heat treated steel.
  • Provides Ultimate Traction In Extreme Off Road, Circle Track And Drag Strip Conditions
  • Bullet Proof, Competition Proven Design
  • Low Cost Posi Alternative
  • Easy installation
See more details

Key Specs

MFG. Part #91041230
Garage Sale TypeDiscontinued
Spool TypeFull
Spline Count30
Spool WeightStandard
See more specs

Need To Know

Ineligible for Return

Contains items that cannot be returned

Speedway Motors 91041230 Details

GM 12-Bolt Steel Full Spool, 30 Spline

Spools are an alternative to a locker as traction and performance enhancement. Spools are a favorite of off road competitors, dirt track racers and drag racers. A differential with a spool set up delivers equal power and traction to both left and right side rear wheels. Spool solutions are less expensive than lockers and weigh less. We offer a full line of mini and full spools in the most popular applications for such differential modification.

Features

  • This is a steel full spool made from 4130 aircraft alloy heat treated steel.
  • Provides Ultimate Traction In Extreme Off Road, Circle Track And Drag Strip Conditions
  • Bullet Proof, Competition Proven Design
  • Highest Quality Steel Alloys
  • Low Cost Posi Alternative
  • Easy Installation

Specs

Type 4-series 12-Bolt Car rear end with 3.90-6.14 ring and pinion

Speedway Motors 91041230 Specifications

KEY SPECS
MFG. Part #91041230
BrandSpeedway Motors
Garage Sale TypeDiscontinued
Spool TypeFull
Spline Count30
Spool WeightStandard
Material TypeSteel
GENERAL
FinishZinc Plated
Sold in QuantityEach
NotesFS1230

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5

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Would buy again

5.0

5 months ago

Dragster

.norwalk ohio

Verified

Use in my race car love it

Would Recommend

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Questions & Answers

4 Questions • 4 Answers

Hello, I have a 12 bolt car housing, with 31 spline Moser axles. Will this work and will the factory carrier bearings work?

by A

• 8 years ago

1 answer

what is the spline count on this? also is it 8.875 inch or different also do you sell the bearings for it?

by Rob

• 10 years ago

1 answer

my truck has a series 4 carrier will the 488 gear work with this spool?

by madman

• 10 years ago

1 answer

Will this work on fm 12 bolt truck axle and add a set of 4:56 gears

by Daryl

• 10 years ago

1 answer

4 of 4 questions shown

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