maggotpez

I was wondering which one should I go with 3.73 or 4.10? And can you reuse your old seal, bearings, etc... (I don't want to pay for new ones if I don't have to)? Also do you need to get programed after you change them?

1slowZinthe513

iTrader: (10)

if you have an auto.. 3.73 if you have a stick.. 4.10

AR15 guy

iTrader: (1)

What he said. I would replace the bearings...especially if your rear end has higher mileage. You don't want to have to tear into it again.

maggotpez

Auto so 3.73 and it has only 70k say I'll hold off on bearings till i can afford it what about the tune is that a must have or can that wait also?

1slowZinthe513

iTrader: (10)

not sure if it is a MUST but your mph wont read 100% accurately .. it will be a little off

2nd3rd4thgen

it will be about 20mph off and your odometer will rack up miles faster...

blackz6sp

iTrader: (11)

You need to get it tuned otherwise your shift points will be off.

mliers

I've got 4.10s on my auto but I also have a 28in tire, so that helps a lot. Stock tires I'd go 3.73, kinda wish I had the 3.73 sometimes

BlackScreaminMachine

iTrader: (17)

I am more of a fan of setting up the rear to what your running for a combo, like engine, drive train, weight and the type of racings. Gears/Stalls should be geared to the situation or dial in the combo.

BUT it be very general, the M6 due to its very tall 1st gear benefits greatly from a 4.10 and Auto's respond very well to 3.73's. If the car was going to stay perm N/A you can go a step higher (M6 4.30's and A4 4.10's) and really leave the hole good.