Help buying posi unit. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

evan · 10-27-2007, 10:33 PM

I need some help figuring out which model I need from Moser. I need to specify spline and carrier.
http://www.moserengineering.com/Page...eatonposi.html

I've got a 12 bolt rear diff and according to their website the 12 bolt truck rear diffs only came with 30 spline. Is that accurate?

I did the "spin the tire and count the revolutions of the drive shaft" test and got 17 in 10 which I think means [(17*0.1)*2]=3.4. According to the Moser sight again, the ratios from 2.76 to 3.42 use the 3 series carrier.

That should mean I need a 3 series carrier and 30 spline unit. Am I right?

10-27-2007, 10:33 PM	#1
evan Registered User Join Date: Jul 2005 Location: SK, Canada Posts: 488	Help buying posi unit. I need some help figuring out which model I need from Moser. I need to specify spline and carrier. http://www.moserengineering.com/Page...eatonposi.html I've got a 12 bolt rear diff and according to their website the 12 bolt truck rear diffs only came with 30 spline. Is that accurate? I did the "spin the tire and count the revolutions of the drive shaft" test and got 17 in 10 which I think means [(170.1)2]=3.4. According to the Moser sight again, the ratios from 2.76 to 3.42 use the 3 series carrier. That should mean I need a 3 series carrier and 30 spline unit. Am I right? __________________ Evan B. Last edited by evan; 10-27-2007 at 10:34 PM.

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