Author Topic: 28 spline vs 30 spline axles  (Read 9436 times)

Offline 81Cheyenne

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28 spline vs 30 spline axles
« on: June 17, 2008, 03:01:27 PM »
I bought a used posi unit and was told that it was 28 spline. Well guess what....after I got it home and counted the splines: 30 splines.  >:( It's going in a 81 C10 10 bolt that currently has 28 spline axles. Looks like I might be stuck with this posi so my question is: Can I swap out the 28 spline axles for 30 spline axles? Will they interchange?

Offline VileZambonie

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Re: 28 spline vs 30 spline axles
« Reply #1 on: June 17, 2008, 03:21:42 PM »
Nope. Are you saying you wanted to just swap the axle shafts for a different lug pattern?
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Offline 81Cheyenne

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Re: 28 spline vs 30 spline axles
« Reply #2 on: June 17, 2008, 03:25:36 PM »
Are you saying you wanted to just swap the axle shafts for a different lug pattern?

Nope.  I just wondered if I can swap out to 30 spline axles to go with the 30 spline posi that I'm stuck with instead of selling it and then finding a 28 spline posi. I would stay with 5 lugs.

Offline SUX2BU99

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Re: 28 spline vs 30 spline axles
« Reply #3 on: June 17, 2008, 03:32:17 PM »
Did you buy a 12 bolt rear end? As far as I know, the 10 bolts had 28 splines and the 12 bolts had 30 splines. Why not just swap the entire diff out for the new one? Oh wait, I'm now thinking that you only bought the posi unit itself and not the entire diff, right?
85 Chevy Silverado C10 short, wide, yellow, 2wd. Lowered, 60-over 350 with Dart Iron Eagle heads and Comp Cams XE268 cam, TH350 w/ shift kit, 3.40 Gov-lok 12 bolt.

Offline 81Cheyenne

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Re: 28 spline vs 30 spline axles
« Reply #4 on: June 17, 2008, 03:54:38 PM »
Right. It's a 8.5" carrier tha fits a 10 bolt rear end