Decode, ID, and upgrade your GM 12-bolt rear end. Learn axle specs, gear ratios, and best performance parts upgrades.

GM 12-Bolt Rear End Identification & Upgrade Guide

Need a little help Identifying GM Body Styles 1964-1972? Click Here!

GM Body Styles

In this budget build, a GM rear end is upgraded in order to hold 400+ HP. See how spherical bushings are replaced in a used 8.5” GM 10 bolt rear end.

Replacing GM Rear End Spherical Bushings

Learn how Zach replaces a transmission and breakaway converter in his 55 Chevy, with some helpful tips along the way.

Transmission Replacement on a 55 Chevy

Learn how to swap out an LS engine with a modern fuel injected engine into a hot rod for added horsepower, fuel economy, or throttle response. View a list of parts and helpful tips to complete the installation.

LS Swap Guide: GM 3 Speed / 4 Speed Parts List

Learn about GM alternator identification in our guide. We cover GM 3 wire alternators, 1 wire alternators, and externally regulated so you know what to choose.

GM Alternator Identification

Exlpoded View of the Bert 1300 Late Model Racing Transmission

Bert 1300 Late Model Racing Transmission

Learn how to replace a fuel sending unit. Our fuel gauge sending unit guide and installation video covers all you need to match your fuel sender and gauge.

Replacing Fuel Sending Unit

Engine Family Facets

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GM B-Body Buick Odd Fire V6 Fireball 231 Transmission Parts

GM B-Body Buick Odd Fire V6 Fireball 231 Transmission Parts | Speedway Motors

Shop GM B-Body Buick Odd Fire V6 Fireball 231 Transmission Parts and get Free Shipping on orders over $175 at Speedway Motors.

Hays 85-100 Clutch Kit, 10.5 Inch Diameter, Chevy/Pontiac/Buick

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Friction Material

Spline Count

Hardware Included

Flywheel Included

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Pressure Plate Style

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Throwout Bearing Included

Alignment Tool Included

Pilot Bushing Included

Counterweight Assist

MFG. Part #

GTIN Code

10.5" Diameter, Organic Friction Material

Ram Clutches 92760 Clutch Set, GM, 10.5 x 1-1/8-10, Diaphragm

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1.125" Input Shaft Diameter, 10.5" Diameter

Mr Gasket Magnetic 15 1/2"-20 Oil Pan Plug

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1/2"-20 Thread Pitch, Gasket(s) Included

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GM B-Body Buick Odd Fire V6 Fireball 231 Transmission Parts

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Hays 85-100 Clutch Kit, 10.5 Inch Diameter, Chevy/Pontiac/Buick

Ram Clutches 92760 Clutch Set, GM, 10.5 x 1-1/8-10, Diaphragm

Mr Gasket Magnetic 15 1/2"-20 Oil Pan Plug