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Senior Member
![]() Join Date: Jan 2017
Location: Traverse City, MI
Posts: 221
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Re: 1985 c10 rearend
1989 was the official change to 30-spline for square bodies, some 1988's did receive 30-spline in late production vehicles. I found this out with a 1988 K20 Suburban - was supposed to be 28-spline front with an NP208 transfer case, mine was built June 1988 and had 30-spline axles in the front with an NP241 t-case.
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