3.23 vs. 3.42

[cep39]

I am having trouble deciding between 3.23 and 3.42 gears. I want better acceleration, but i travel on the highway a bit and I don't want to hurt my gas mileage too much. Could anyone with these two gear ratios tell me what your rpm's are at highway speeds, because right now i run about 2000 rpms at 70 mph.

[Sean76]

Re: 3.23 vs. 3.42

I have 3.42's in mine. My highway RPM's at 80-85 are like 3000 and I get 22.6 mpg using the mid grade 89 oct. fuel. I actually just filled up this morning and checked my mileage.

[kristen]

Re: 3.23 vs. 3.42

well 3.23 are stock gears usually in our cars. so to go up to a 3.42 really won't hurt your gas millage too much. are you an a4 or a m5?

[cep39]

Re: 3.23 vs. 3.42

I have a 99 A4 and I checked the rpo codes on the door and apparently I have an open differential with 3.08s.

[cep39]

Re: 3.23 vs. 3.42

I was also wondering if anyone who changed their gears could tell me if I could just go to a chevy dealer and have the speedo re-calibrated and how much they charge, or would I have to use pcmforless or texas speed or something like that?

[3.4 slow to go]

Re: 3.23 vs. 3.42

go w/the 3.42 bird runs about 65~70 @ 2500 it's an auto

[Chevy16]

Re: 3.23 vs. 3.42

sorry to highjack but i found a good deal on 3.42s on another site and 3 series wont fit a 2 series posi right? or would it fit with spacers?