Papa Wells

Ok, so I searched and found few threads that were similar, but I couldn't find something that fit my setup.

The car is a '98 WS6, 408ci LQ9, F1-A ProCharger at 16-17psi, T56 transmission, 295/55/15 tire, and I am shooting for somewhere in the 800-850rwhp range for now. I will be going to a 9" soon and I can't decide on which gear I want to go with. The car will only see the track once or twice, and will be street raced/roll raced often. I can't stress that enough.

I have talked to Bob @ Brute speed and he recommended a 3.70 gear. I fully trust his opinion, but I just wanted to see what others would say. People are telling me to go with a higher gear such as a 3.55 due to traction issues but I can't decide. So far it is between a 3.55 and a 3.70.

Any input is welcome. Thanks.

ramairetransam

iTrader: (18)

no way you want a 3.70 with that much power , i would think that a 3.50 would be the max . your gonna have tons of power and dont need to be shifting so often and with that tall of a tire .

Guitar

iTrader: (9)

If you are street racing, assuming rolls, I'd go with something like 3.23 or even lower. You want a lot of run out up top as I know a lot of high HP cars like running until 150+, all the 3.70 or higher is going to make you spin and run out quickly.

Papa Wells

I am leaning more towards the 3.50 now. I was thinking it was going to be too short with the 3.70.

Papa Wells

I appreciate the replies.

Blackpanther99

iTrader: (8)

For street racing on high rolls I would do 3.50s or 3.23s. 3.70s will be a good choice for the track.

Papa Wells

I am pretty set on 3.50's. Thanks

Blackpanther99

iTrader: (8)

Youll love them.

Papa Wells

Thanks bud.

Blown Goat

IM making about 880 to the rear wheels and have 3.50's in a 9" rear. I have basically the same setup you do. 408 stroker with an F1a. Im happy with the gear, but the rear roars, Asking the Driveshaft Shop to make it right. Its a brand new assembly.

Blackpanther99

iTrader: (8)

Have you done any high rolls?

Blown Goat

My stock T-56 wont handle 1/4 mile launching. I don't know what to do about an upgrade or a rebuild of my own. Right now, all I "fool around" with is street at a roll. Tires now are still M/T DR's so they break loose fast. I don't quite know how to handle it "YET"....

Blackpanther99

iTrader: (8)

Ahh i see.

Papa Wells

Glad to hear someone with almost the same build chime in. I'm going to do the 3.50's for sure. How does your car do from a roll? Does the boost come in hard? I'm eager to drive mine haha. What pulley are you using for 16psi?

SmokedOutZ28

iTrader: (35)

Did you end up with 3.50 gear? I have a very similar setup making same power on 12psi.

want to get my gears right the first time.

Papa Wells

I don't have it yet, looking into doing a 4L80e swap and selling the T56. I will most likely still be doing the 3.50 gear even with the auto.

ICRAZY6

iTrader: (68)

I'm thinking about changing my gears out as well but I'm an A4. Currently running 370's any thoughts? Only running 13lbs D1sc, but want to pulley it more once I get back to the states.

Bob@BruteSpeed

iTrader: (16)

We had a 408 in my Camaro, an F-1C was being used when the above video was taken. I had a Moser M9 (the first Moser M9 ever made for an F Body) with 3.70 gears. 28" tall tires, going through the traps in the 1/4 at 6800 rpm with a powerglide. Bob

Papa Wells

That is an awesome video, Bob!

Bob@BruteSpeed

iTrader: (16)

Thanks, the car made good power. KP had an F-1A in his '98 Trans-Am and ran 8.80 something with 3.70 gears and 28" tall tires. For the dragstrip the 3.70 gear and these similar combinations work out very well. Bob