redZ

How much would my mielage drop with cnanging my stock 3.42, to 4.11s. i have a t-56. just wondering how often I would be filling up. Or would it be better to go with 3.73 for mileage sake or would the performance not be as great. Thanx in advance.

mike c.

iTrader: (1)

they say going from the 3.42 to the 4.10 your milage will only change by one mpg. if you dont have a 12bolt,i would go with the 3.73's.

mcflyz28

around town mileage went up 2 mpg on the highway it went down about 2 mpg. With an M-6 mileage should not be a concern I cruise at 70 at less than 2000 RPM and get 26-27 mpg.

Steve Burger

iTrader: (33)

I lost ~11 MPG with 4.11s. That could be because I can't keep my foot out of it though.

Really it didn't change of I drive sane.

99 Black Bird T/A

iTrader: (4)

Did heads and cam at the same time so it's hard to really know what caused what.

before 4.10 gears, heads and cam ~ 23.5 to 24.5 mpg

before 4.10 gears, heads and cam best mpg on trip 32.8mpg

before 4.10 gears, heads and cam worst 16 mpg - first tank of gas.

after 4.10 gears, heads and cam average 21-23mpg

after 4.10 gears, heads and cam best 26 mpg

after 4.10 gears, heads and cam worst 16 mpg

~250 mile trip to drag strip with some driving in small towns & 6 passes at the strip 25mpg with gears & H & C