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02-26-2023, 04:40 PM | #1 |
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Join Date: Jul 2012
Location: Concrete, wa
Posts: 59
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What differentials do I have
I am looking for diff rebuild kits for my 89 K2500 (7200GVWR)
I find a number of different kits for ring gear diameters from 10.50 down to 8.50. The RPO Code is GT4. The wheels are 6 bolt NOT 8 bolt and the diff cover is 10 bolts. What size ring gear do I have front and rear? As soon as I know, I will be calling Parts Geek and ordering the kits. Thanks Steve
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1989 Silverado K2500ECLB- 307K miles with 90 K TBI 350-Not a show truck, a work tool that I can drive! 1998 Dakota EC 250K miles- I guess I'm just a truck guy now! |
02-26-2023, 06:52 PM | #2 |
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Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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Re: What differentials do I have
Should be 14 bolt semi float, 9.5" ring gear. Front is the same as a 1/2 ton, think they are 8.25?? Not 100% sure.....Randy's Ring and pinion can tell you what you have.
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
02-26-2023, 09:42 PM | #3 | |
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Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
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Re: What differentials do I have
My C2500LD had a 6 lug 14 bolt, but I swapped it out with a 10 bolt. That might be what happened with yours. See if it has a conversion u-joint. Two cups will have an inner c clip and two will have an outer clip, plus the cups are different diameters.
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02-26-2023, 10:31 PM | #4 | |
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Join Date: Jul 2012
Location: Concrete, wa
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Re: What differentials do I have
Quote:
Thanks Steve
__________________
1989 Silverado K2500ECLB- 307K miles with 90 K TBI 350-Not a show truck, a work tool that I can drive! 1998 Dakota EC 250K miles- I guess I'm just a truck guy now! |
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03-03-2023, 04:53 PM | #5 |
Registered User
Join Date: Jul 2012
Location: Concrete, wa
Posts: 59
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Re: What differentials do I have
I found after the snow stopped that mine IS the 14 bolt 9.5 rearend.
The parts and ring gear are coming from E-Boy next week. Next question: I have a choice between 11 and 13 inch rear brake hardware kits. any guess which size the truck should have? It is a bit frustrating that the truck is not the BIG full size and not the LITTLE full size but a mix of both with a few parts unique to the 7200 GVWR trucks.
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1989 Silverado K2500ECLB- 307K miles with 90 K TBI 350-Not a show truck, a work tool that I can drive! 1998 Dakota EC 250K miles- I guess I'm just a truck guy now! |
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