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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Blazer gear ratio change for Chevy 292
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Topic Review (Newest First)
06-29-2012 07:29 AM
big gear head The 8.5 corporate rear end uses the same 3 series differential for all gears from 2.73 to 5.13. The 2.56 to 2.14 gears use a 2 series differential. It would be much easier for you to find a complete rear end with the gears that you want instead of trying to change the gears in the one that you have. You can not simply take a set of gears out of one rear end and bolt them into another without setting the pinion depth, bearing preload and backlash.
06-25-2012 08:49 PM
boilernspector
Rusthater

Thanks for the info.....
06-25-2012 08:02 PM
rusthater89 It might not fit right because the pinion gear will be too big when changing the gears to a ratio that is numerically lower. You may need a new carrier.
06-25-2012 04:18 PM
boilernspector Thanks, I'll have to think about that one.....
06-25-2012 03:23 PM
F-BIRD'88 Might consider robbing the 5 speed manual trans from a third gen or 4th gen camaro/firebird to gain a OD ratio.
06-23-2012 04:05 PM
bullheimer http://www.ringpinion.com/ and go to calculator. if you are using a truck rear end you might not even be able to get higher gears like that 2:73 so check what's available. i think under 3 would be a mistake. thought about taller tires?
06-23-2012 11:21 AM
boilernspector
Blazer gear ratio change for Chevy 292

I have a rat rod with a 1995 Blazer 8.5-10 bolt rear end, with G-80 Eaton limited slip,3:72 gears. This is matched up to a Chevy 292 with a 3 speed Saginaw tranny.
This setup is to low for cruising. 55mph=2500 rpm, I was thinking of changing the rear end gears to a 2:73 or 3:08. Any help/ideas,suggestions would be appreciated......

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