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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