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Old 10-01-2010, 06:05 PM
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30 spline differential axle or not?

how do i figure out if my rear end is a 30 spline or 28 spline?

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Old 10-01-2010, 06:10 PM
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The obvious...pull an axle and count the splines .

First off, what rear axle?? 12-bolts are all 30 spline stock, 8.5" 10-bolt can be either depending on year. What year is it?? You can tell by year if it hasn't been swapped.
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Old 10-01-2010, 06:14 PM
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If this is the '71 Chevy truck 12 bolt then it's got 30 spline axles and a 30 spline pinion.
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Old 10-01-2010, 07:38 PM
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ya its my 71 truck rear end and ya its a 12 bolt the gears are 41/11 (3.73) gearing also im thinkin its a GM 8.875
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Old 10-01-2010, 09:45 PM
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You are correct, it is a 8.875 (8 7/8) Chevy 12 bolt truck rear end.
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