Diff Gearing
Thread Starter
Instructor
Joined: Dec 2016
Posts: 209
Likes: 42
From: Chestertown Maryland
Diff Gearing
Have an 06 M6 using the car mostly for street with some Drag Strip use. I have recently done headers and cam etc. and is now at 448 whp. I'm scared of rear diff problems so I'm considering RPM Transmissions kit to change out the rear. I plan to use drag radials in stock size 305/35/19 because I have a set of spare wheels for that. My question is what gear ratio should I put in it 342 373. 390. Or. 410
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 587
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
4.10 don’t fear the gear! I had them in my 6 speed car and loved them. Good for the strip and crazy fun on the street.
That said, unless you’re using the stock clutch, I would highly recommend using a bias ply tire.
That said, unless you’re using the stock clutch, I would highly recommend using a bias ply tire.
Thread Starter
Instructor
Joined: Dec 2016
Posts: 209
Likes: 42
From: Chestertown Maryland
I'm just getting back into this from old school drag racing days. Not sure about the choice of bias vs radial deal. Also was planning to put in a new stock style clutch since I don't have any crazy power and low budget. Your thoughts?
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 587
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
The issue with aftermarket clutches, is that they typically grab harder. That induces wheel hop which breaks rear ends, axles, and transmissions.
The bias ply tire is a lot more forgiving in those instances. The downside of running a bias rear, is that you really need to run a bias front tire as well. Just added expense.
Best of success with your goals!
The bias ply tire is a lot more forgiving in those instances. The downside of running a bias rear, is that you really need to run a bias front tire as well. Just added expense.
Best of success with your goals!
