What to do

[Mookz1]

My Trans Am is putting about 500 RWHP (408ci) and on street tires I was able to get a 1/4 mile time of 12.27. I know it has a lot more in it but that would have to include a rear end that I can slap some slicks on it. I want it to be a good street car with the same handling abilities but race it without worrying about breaking. Also, I've had my T-56 rebuilt before, its still a good transmission but I want one thats bulletproof. Any suggestions?
My thoughts are seeing if anyone has a hardcore T-56 (hardended syncros and gears) for cash and my T-56. Also.....what rear end and gears should I go with? Thanks in advance.

[pajeff02]

9" with 4.10's will work well for you.

[brendan.9]

need more information. what's your 60ft? mph?

[35th-ANV-SS]

You definitely need a lower gear than that 3.42 you have. You can send your T56 in to Tick, RPM, or another reputable builder and have them beef it up for around 2K. I don't know what your budget is, but at this point, I would be considering upgrading your rear end before building up the trans.

T56's are pretty stout with the exception of the synchros, 3-4 shift fork, and the output shaft. I've seen cars well into the 10's running stock T-56's before.

As far as rear end, I would look at a 9" Midwest Chassis or Moser.

Gears really depend on what your mods are and where your power is...also what tire you plan on running. Curtis on here was running a 4.56 with his 408 and was contemplating on going even lower than that.

The idea is to calculate based on tire size and power so you are crossing the line at your maximum power band.

[Mookz1]

My best pass last season was 60' 2.078, 1/8 mile8.055 @ 91.41mph; 1/4 time of 12.299 @ 117.09mph.
Im not sure what size tires yet, I am open to suggestions.

[pajeff02]

Have you considered a dedicated set of track wheels and tires?

[Mookz1]

Yea, I would like to have a set of track wheels and tires.

[vicjr]

I would go with a turbo350 tranny and a 12 bolt rear. With some race tires.

[pajeff02]

Yea, I would like to have a set of track wheels and tires.

There are a couple of 15" rims that will fit with little or no modification to the brake calipers. This will allow for a tire with more sidewall and much better launch characteristics.

[35th-ANV-SS]

I was going to suggest the same size that Jeff is recommending.