TA1364

iTrader: (11)

Im going to put 373s in my a4. will it stay out of OD in 1/4 mile? Im hoping its all i need to get me in the 12s. Im thinking about going with motives, but where can I get them and the install kit??

BlackScreaminMachine

iTrader: (17)

http://en.wikipedia.org/wiki/GM_4L60-E_transmission (for ratios)

http://www.f-body.org/gears/ (for calculator)

I did a quick calculation based on a 6k redline, 245/50-16 or 26" tall tire, in 3rd gear you should hit redline @ 123mph. So basically a wicked h/c set up, or a good shot of juice on a cam only set up would I worry about hitting it. Worse comes to worse, you short shift so you come in lower in the next gear, this saves taggin the limiter at the end of the track

http://www.thunderracing.com for gears and kit.

FiredUpZ28

Keep it out of D or OD when you race. Wow Im totally bookmarking that trap speed calculator

BlackScreaminMachine

iTrader: (17)

just comment about my post, there is no short shifting unless programmed lol.

TA1364

iTrader: (11)

yea i wont ever be concerned about going 123 on the race track lol. You think it will pick it up around .2? I just want a 12.99 slip before the track closes

BlackScreaminMachine

iTrader: (17)

As long as you can cut a 1.7 60 foot, I think its definitly attainable, take all extra weight out of it, and let it fly.

TA1364

iTrader: (11)

Another question, Do i have to buy the complete install kit even tho i dont need pinion and carrier bearings? Only thing it has i need is pinion nut and ring gear bolt

BlackScreaminMachine

iTrader: (17)

Get the kit, its cheap, save the xtras for future needs.

TA1364

iTrader: (11)

Thanks

AK47

I ordered my motive gears from summit and the deluxe install kit from texas speed. What gears do you have in now?

TA1364

iTrader: (11)

323s, might have traction problems on street tire but we'll see

michaelg589

iTrader: (1)

I have 3.90s and I dont hit the rev limiter in the 1/4 with 25.6" tall tires.

Black_Bird

iTrader: (6)

You have an M6, he has an auto.

michaelg589

iTrader: (1)

Doesnt matter unless youre shifting into O/D in the quarter. 4th gear in a M6 is the same as 3rd in a Auto.

TA1364

iTrader: (11)

when u put 3.90s in ur car could u tell a difference?

michaelg589

iTrader: (1)

I noticed a difference as soon as a started out in 1st gear when I finally got it back from the mechanic. I was worried about hitting the rev limiter in the 1/4 with 4.10s, thats why I went with the 3.90s.

TA1364

iTrader: (11)

Anyone want some brand new pinion and carrier bearings? I just put some in a month ago dont need them again!!