07-29-2016, 07:42 AM | #1 |
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Join Date: Aug 2011
Location: Rockport, Tx.
Posts: 79
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Rear End
I've got a lot of play in the rear end on my '76---- pretty good "clunk" when putting it in drive from park, or drive to reverse.
I've found a rear end out of an '88 that's supposed to be 5 lug, in decent shape. My question is, will the '88 rear end fit under my '76 in terms of spring perches, lug patterns, etc. Anyone made a swap like this? BTW---my truck is short step side 1/2 ton. |
07-29-2016, 08:05 AM | #2 |
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Join Date: Jun 2004
Location: Murfreesboro, Tn
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Re: Rear End
Before you go swapping out rear ends, i'd first check the u joints (if you haven't already). Thats usually a major culprit of the notorious clunk! If it is in fact the rear end i would think a 73-87 1/2 ton rear would be plentiful in the junk yards down there. I'm not sure on the 88' model for a direct swap. I would think you would run into shock placements, brake line sizes, etc..? Usually the newer body style meant they changed a bunch of other stuff up. Good luck tho!!
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07-29-2016, 08:26 AM | #3 |
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Re: Rear End
Have to start moving spring perches and shock mounts... Also don't know if 76 was standard or metric brake lines, but I know 88 is metric... My 79 was metric.
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07-29-2016, 08:37 AM | #4 |
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Re: Rear End
I believe they changed the springs pretty substantially for the GMT400 platform. I'm not positive but I wouldn't get my hopes up. And if the diff. is wearing out it should be making a pretty noticeable noise, especially at low speeds - Turbo Hydramatics can shift pretty hard (especially reverse, at least on a 400) and U joints are worth checking.
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Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
07-29-2016, 10:44 AM | #5 |
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Re: Rear End
Pull the cover and check the backlash between the ring and pinion gears. They are probably ok. A lot of times it's just worn spider gears causing the slack, and they are easy to replace.
Like these: https://www.summitracing.com/parts/yga-16043 Mike
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07-29-2016, 01:27 PM | #6 |
Diggin The SquareLife
Join Date: Dec 2010
Location: garland,tx
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Re: Rear End
gotta make spring mounts shock mounts brake lines etc....an it be to wide...if ur gonna swap rear ends try to find a impala ss rear end
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07-29-2016, 02:19 PM | #7 |
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Join Date: May 2009
Location: Good Thunder Mn.
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Re: Rear End
My rear end had a ton of play, it would bang hard when shifting out of park. New spider gears fixed it right up, pretty cheap, and easy to install.
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07-29-2016, 05:21 PM | #8 |
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Join Date: Jul 2016
Location: Sutherlin, Oregon
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Re: Rear End
My 81 has a 12 bolt that is not metric in the rear, fronts are.
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