rear gear questions

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Oct 14, 2007 | 08:34 PM

maggotpez

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From: Clovis NM

rear gear questions

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?

Oct 14, 2007 | 08:50 PM

1slowZinthe513

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From: Cincinnati OH

Quote:

Originally Posted by maggotpez

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

Oct 14, 2007 | 09:07 PM

AR15 guy

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From: Barboursville, WV

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.

Oct 14, 2007 | 09:13 PM

maggotpez

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From: Clovis NM

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?

Oct 14, 2007 | 10:00 PM

1slowZinthe513

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From: Cincinnati OH

Quote:

Originally Posted by 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?

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

Oct 14, 2007 | 11:27 PM

2nd3rd4thgen

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

Oct 15, 2007 | 04:47 PM

blackz6sp

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From: Indiana

Quote:

Originally Posted by 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?

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

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Oct 16, 2007 | 06:48 AM

BlackScreaminMachine

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From: Wallingford CT

Quote:

Originally Posted by maggotpez

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.