Will a 3:42 rear kill a 225,000+ mile tranny use to a 2.73 gear?
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Senior Member
Joined: Apr 2000
Posts: 682
Likes: 24
From: MidWest
Car: 91 RS/ 99 T/A/ 72 Vette/ 02 Z28
Engine: LSx/ Dart400
Transmission: M6/ M6/ TH400/ 4L60E
Axle/Gears: 4.10's / 3.08/ 2.73
Will a 3:42 rear kill a 225,000+ mile tranny use to a 2.73 gear?
Need Rear End Advice...got 3.42 Zelex-Torsen...will it kill mpg and the tranny?
The short version is I bought 3.73 auburn for my T/A....since the T/A is a M6 now I have a spare 3.42 Zelex-Torsen.
My Camaro has the 2.73 gear open diff in it now. If I swap in the 3.42 rear how much gas mileage will I lose? How much 1/4 mile time will I gain.
The car dyno'd 132rwhp and 220rwtq but it has 225,700 miles on the original tranny. Will the new rear add strain on the tranny and kill it?
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91 RS Camaro 305TBI w/198,500 miles
99 TransAm
72 Vette
The short version is I bought 3.73 auburn for my T/A....since the T/A is a M6 now I have a spare 3.42 Zelex-Torsen.
My Camaro has the 2.73 gear open diff in it now. If I swap in the 3.42 rear how much gas mileage will I lose? How much 1/4 mile time will I gain.
The car dyno'd 132rwhp and 220rwtq but it has 225,700 miles on the original tranny. Will the new rear add strain on the tranny and kill it?
------------------
91 RS Camaro 305TBI w/198,500 miles
99 TransAm
72 Vette
Supreme Member
Joined: Jan 2001
Posts: 7,164
Likes: 1
From: Someone owes me 10,000 posts
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
I would say with 3:42's you might gain .4-.6 tenths in the quarter. MPG might decrease or it might not, probably not noticable. I just got 3:73s from 2:73s and haven't noticed a decrease in milage.
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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite
------------------
"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite
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