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post #1 of (permalink) Old 04-01-2003, 09:50 PM
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Final Gears

Does anyone know what my final gear ratios are in my 84 4x4 S-Blazer Tahoe model, 2.8L auto? And what ratio works good in these trucks for on road and off-road use? thanks
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post #2 of (permalink) Old 04-01-2003, 11:36 PM
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Re: Final Gears

an 84 blazer stock should have a 3.42 gear ratio. that gear is great off-road and on-road if you have the stock or the same size as stock tires on it. anything bigger than the factory tires and you will notice a power loss. the bigger the tires, the bigger the ratio needs to be...

31 in. tires--3.73
33 in. tires--4.10
and so on...
post #3 of (permalink) Old 04-02-2003, 03:02 AM
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Re: Final Gears

Taken from
GM was nice enough to put a dash plaque (laminated paper inside glove box) in our vehicles that lists a bunch of codes... If you see any of the following codes listed then you have the axle ratio specified...
GM8 = 2.56
GU2 = 2.73
GU4 = 3.08
GU6 = 3.42
GT4 = 3.73
GT5 = 4.10
HO4 = 4.11
G80 = Posi

The 2.56 was a 2wd option only in 82 while the 2.73 option was only an option in 82-83... An interesting thing to find was the 2.73 was an option even on the 4wd in 83...

Bad-Bowtie, M.Hall

Original Topic Thread from found here.
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post #4 of (permalink) Old 04-02-2003, 08:24 PM
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Re: Final Gears

Awesome thanks alot!!
post #5 of (permalink) Old 04-03-2003, 01:28 AM
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Re: Final Gears

Next time it'll cost you a beer! [img]images/graemlins/givemebeer.gif[/img] [img]images/graemlins/40BEER.gif[/img] [img]images/graemlins/tongue.gif[/img]
post #6 of (permalink) Old 04-03-2003, 07:59 PM
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Re: Final Gears

Deal!! Later [img]images/graemlins/40BEER.gif[/img]
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