rear gear change performance question?
Thread Starter
Instructor
Joined: Mar 2007
Posts: 129
Likes: 0
From: Sugar Land, TX (suburban Houston area) U.S.A.
St. Jude Donor '09, '13
rear gear change performance question?
Hi all,
I have spent an hour or so doing different searches & see lots of opinion on rear gears being a great "bang for the buck" mod for auto cars.
My 92' LT-1 auto is stock & I think 3.73 gears will wake it up BUT I have not been able to find anything stating real world 1/4 mile time improvements so I can get an idea of just how much "bang for the buck". Car is strictly weekend cruiser so I don't care about MPG, etc.
Can anyone point me to some real world improvement times for gear swap only? Not that it is a big concern but what does this do to the top end performance?
If I missed a thread on this sorry! Thanks all!
JK
I have spent an hour or so doing different searches & see lots of opinion on rear gears being a great "bang for the buck" mod for auto cars.
My 92' LT-1 auto is stock & I think 3.73 gears will wake it up BUT I have not been able to find anything stating real world 1/4 mile time improvements so I can get an idea of just how much "bang for the buck". Car is strictly weekend cruiser so I don't care about MPG, etc.
Can anyone point me to some real world improvement times for gear swap only? Not that it is a big concern but what does this do to the top end performance?
If I missed a thread on this sorry! Thanks all!
JK
Racer
Joined: Apr 2000
Posts: 299
Likes: 5
From: East Haven, Ct
Rear Swap
Hello, I went from the stock rear I think 2.59 or something like that. I put in a Stock Dana 44 with 3.54's Did a custom exhaust, power programmer to change gears and shift points. Went from 14.00 to a best of 13.4. She runs 13.5s to 13.7s everyday. Gas Mileage went from 24 average to 22 average. Of course it's even lower now cause it's much more fun to jump on!!!
Last edited by LUDS 96; Jul 29, 2010 at 11:35 PM. Reason: add
Pro
Joined: Jun 2006
Posts: 508
Likes: 1
From: Miami Florida
I just installed a 3.75 rear end after originally going from a 2.59 to a 3.07. The difference was big time. I picked up 3 tenths in the 1/8 mile and 3 mph. Gas mileage dropped a bit to about 19 on the highway, but the response when you step on the loud pedal is fantastic.
Drifting
Joined: Nov 2009
Posts: 1,341
Likes: 2
From: Perth Western Australia
St. Jude Donor '10
I found a pretty good free demo "straightline acceleration simulator" for calculating mod benefits including diff changes:
http://-nohomewww.performancesimulations.com/
http://-nohomewww.performancesimulations.com/
Racer
Joined: May 2005
Posts: 497
Likes: 1
From: Casa Grande Az
