89 suburban specs
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Elder User
Joined: Sep 2007
Posts: 502
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From: Middle of South Dakota
89 suburban specs
This is for my cousins 89 suburban. He blew out the rear end and and we couldnt figure the gear ratio at all. We couldnt find the manual also. We have a couple of older chevy from the late 70s and and 80s. I was wonderin will a 70s rear end work a 89. also what were the gear ratios offered in 89 for a 4x4 suburban. I am unable to look up most website with my school labtop because they have so many programs that block out everything. Thanks
Postmaster
Joined: Dec 2001
Posts: 3,742
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From: UT
If you're certain he's running the factory ratio, look in the glove box for the RPO code list. I think it should be a Gxx code, then look up those RPO codes in one of several RPO code lists on the internet.
Elder User
Joined: Sep 2006
Posts: 798
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From: Alma Arkansas
the number of ring gear teeth and pinion teeth are stamped on the gear set. It should read something like 14:41
14 is the number of teeth on the pinion gear
41 represents the number of ring gear teeth
divide 14 into 41 and VIOLA! you get the gear ratio, in this example 2.92
14 is the number of teeth on the pinion gear
41 represents the number of ring gear teeth
divide 14 into 41 and VIOLA! you get the gear ratio, in this example 2.92
Elder User
Joined: Feb 2001
Posts: 657
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From: brimfield township,OH
Check the tag on the front axle.It should give you the # of the ring and pinion.Most of those had 3.08's in them.Them options were 3.73 or 4.11. The rears wre weaklinks.If you can find a 12 bolt housing out of an 80 or earlier,I would definitely recommend it.
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