If I were you this is what I would do, keep your Billets with a 315/35 in the rear and move up to a 4.56 rear. On the street, that thing is gonna be fun.

Then, get a set of 15x10 Billets with a 28x12.50 ET STreet and run those at the track. If you are only trappying 117-118 now then that would be about perfect at the track.

I'm doing the same thing, but I am gonna spray a 150-200 shot so I'm staying with the 4.10's.

 

28" 3.90

 

See I have an auto and will be spraying a 150-200 shot as well so I dont want to get to high of a gear, expecially for when I'm on the street with my 26" tires. not to sure how a 3:89 would be, I'm really thinking about that with a 28".

 

i have a th350 through a 9in with 4.33 gears. i would like to spray about a 150 shot. what size tire should i run?