What rear and gears for an M6 with 420+ rwhp?
#21
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Go for the 9in or s60. I have a burkart fab 9 and love it. Went with a clutch type after market posi and 3.90 (26in tire). Drives like stock, kept all my abs/tcs, and could still run factory type TA, and brakes. Make shure you get after market drive shaft also. If you search burkart my install should come up. The s60 will probably cost less in the Long run but weigh a lot more, strong as hell though. Gl
#24
I had considered NO2 but I'm still not convinced that my rebuilt LT1 even with ARP rod bolts and mains would survive over 600 fwhp.
#25
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When upping the power level, you are picking up more speed and you'll be crossing the finish line at a higher rpm. Bob
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PM's disabled, please e-mail me
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https://brutespeed.com/ Link to website
#28
I have 4.30's in my s60 and drive it on the street. I went with the bigger gear to help my car 60ft because it is heavy. I had 430rwhp before the switch to the s60. It will trap about 119 in the 1/4ll with my 6600 rpm limit, on 26 in slicks. On the street, I love the way it drives. But it will spin the tires in first with anymore than 3/4 throttle. I'm ok with it, but I can also see why someone else wouldn't want it. It turns about 2000 rpm at 70mph. I never checked mpg difference, because honestly I don't care about it. Hope that helps.
Ryan
Ryan