I need new gears and posi for my car, badly. currently I have a peg leg 2.73. I want 3.42, but am worried about gas mileage (college). Right now i normally get 18 mpg (almost always stay under 2 grand) pretty steadily thanks to some of my beginner mods. If the 3.42s get crappy mileage I'll probably get 3.23s. thanks for your help.

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late model 91 rs
fully loaded t-tops, red leather
paint- gm red and yellow blend (light red)
custom painted 16" Camaro rims
305 tbi 14"x3" O.E, computer chip, accel super stock plug wires
Edelbrock 3" cat-back
MTX sub and amp, Bose all around
vic_v8@yahoo.com
street kills: a lot of "family" cars, pickups, New v-6 stang, totally killed '86 SC Camaro.

 

hello hello hello......
is anyone out there.....
is anyone listening.....

just a little pink floyd to get me to the top of the board.

 

In overdrive cruising at 40-50 MPH the difference in RPMs is relatively small (maybe 200 RPM) and your mileage won't be compromised that much, if at all. While the RPM is increased the load is decreased, so you won't have to give it as much throttle.


James

 

From what I've heard 3:42's are you're best all around gears, they help your acceleration and are not too harsh on gas. I would guess your gas milage wouldn't drop below 16. But there are many variable that could come into play.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

From what I've heard 3:42's are you're best all around gears, they help your acceleration and are not too harsh on gas. I would guess your gas milage wouldn't drop below 16. But there are many variable that could come into play.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

That is what I run. Went from 2.73 peg leg to 3.42 and Zexel Posi. My car got great gas mileage before. Averaging 20 in town and 31 on the highway. Now with all my listed mods in signature I get 18 in town and 25 on highway. I do have a MUCH better launch than I did before. Still slow though. Need more HP. I just don't have $4000 to do it the way I want yet.

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91 Camaro RS 5.0L Black Convertible 700R4
** Added so far **
*GM Wonderbar,Alston SFC's,spohn LCA's and Panhard rod
*Turbo City Inj Spacer
*Dual Snorkel Air Filter
*March Performance Pulleys
*GM 3.42 Gears with OEM Zexel POSI
*Edelbrock headers
*3" High Flow Cat
*3" Dynomax Exhaust
*Walbro 255 lph Fuel Pump
***Future 330hp Vortec Crate with LT4 hotcam and 454 TBI