1985 c10 rearend - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**WETOWM** · 03-16-2022, 04:03 PM

I have a 1985 c10 2wd pickup is the 8.5 rearend a 28 or 30 spline axle

GRADYS Performance · 03-16-2022, 05:01 PM

30 Spline

Rich84 · 03-17-2022, 08:32 AM

I thought that they went to 30 spline in 88. My 84 was 28 spline.

**WETOWM** · 03-17-2022, 09:11 AM

I was wanting to order a posi unit for it before I took it apart and want to order the right one I guess I may have to take it apart to be sure ?

**THI** · 03-17-2022, 11:17 AM

Quote:

Originally Posted by Rich84

I thought that they went to 30 spline in 88. My 84 was 28 spline.

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.

03-16-2022, 04:03 PM	#1
WETOWM Senior Member Join Date: Jun 2011 Location: ST LOUIS MO Posts: 2,119	1985 c10 rearend I have a 1985 c10 2wd pickup is the 8.5 rearend a 28 or 30 spline axle

03-16-2022, 05:01 PM	#2
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 367	Re: 1985 c10 rearend 30 Spline

03-17-2022, 08:32 AM	#3
Rich84 Registered User Join Date: Mar 2012 Location: Woodbury, Ct. Posts: 1,699	Re: 1985 c10 rearend I thought that they went to 30 spline in 88. My 84 was 28 spline.

03-17-2022, 09:11 AM	#4
WETOWM Senior Member Join Date: Jun 2011 Location: ST LOUIS MO Posts: 2,119	Re: 1985 c10 rearend I was wanting to order a posi unit for it before I took it apart and want to order the right one I guess I may have to take it apart to be sure ?

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