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Old 10-16-2022, 07:36 PM   #5
72SB
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Join Date: Apr 2022
Location: Moorpark, CA
Posts: 775
Re: 72 12 bolt 4 series to 3 series swap?

30 spline

GM 12 BOLT SPECS
Applications:

1964 - 1982 Chevrolet & GMC 1/2 ton to 3/4 ton trucks

Full/Semi Float:

Semi floating rear axle

Ring Gear:

8.875"

Axle Spline Count:

30 spline

Axle Tube Diameter:

3.00"

Pinion Diameter:

1.625"

Pinion Spline:

30 spline

U Joints:

1310 series

Ratios:

2.50 - 4.56 : 1

Carrier Break:

2.50 - 2.76 | 3.42 -4.56

Identification:

12 bolt rear cover, passenger car version has a different cover and is easily distinguishable

GM 12 Bolt axle identification
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