my rear diff

ok i looked it up the code is Gu2 so i have the 2.73 rear diff is that bad? or just slow? is it woth upgrading?

It's the highest gearing that comes in a 10 bolt. Yes, it's worth upgrading.

i am new what would you suggest upgrading to? and what will that do for my performace and gas mileage?

3.73

Up Performance, Lower Gas Mileage

3.73's are nice, but even a 3.42 is a decent step up. Quite often you can find an ENTIRE 3.42 rear end for cheaper than having the parts installed.

Quite often you can find an ENTIRE 3.42 rear end for cheaper than having the parts installed.

That's what I did, I had 2.73's and bought a complete 3.42 rear from a friend upgrading his M6 to a Strange 12 bolt. Gas mileage hasn't suffered too much, even with my converter - speaking of TC's - another option is to keep the 2.73's and get a TC.

3.73 automatics love it youll start to have problems with traction but your car will shoot out of the hole a lot harder.definetly a good upgrade for autos's :usa:

I say get a a torque converter and see how it feels. Then maybe get the 3.42's or 3.73's

I would be cautious about buying an entire rear end out of a M6. Especially somebody who is upgrading to a 12 bolt. You could run into problems if the last person beat on it.

My 3.42 geared, St3500 Yanked car went 12.15. 3.42s and a converter work very well together for an all purpose machine.

i think it depends on what you are using the car for. i have 273's and love them. my car is a daily driver, and i am not too much concerned with the gas mileage but on the highway they cruise. awesome pull in 3rd gear !!

i had my car at the track at pulled a 1.992 60ft with a stock trans,273s and street tires. not too shabby :D

I sold my complete 3.42 rear for $250, that's the way I would go in your situation if you can find one in your area (pretty heavy for shipping).

Rich