jaywill

iTrader: (5)

will 3.89 gear with 28" tire be to much ? 350 trans w/2500 stall...

Steve Burger

iTrader: (33)

We need a lot more information. Max RPM, Shift RPM, 1/4 or 1/8 mile, expected trap speed.......

For reference, I have 3.89 gears and a lot more stall than you in a PG. we are trapping mid 170ish and cross a little north of 8K.

jaywill

iTrader: (5)

1/8...shift 6500..at least 110mph

samdogmx

iTrader: (14)

how fast & what RPM do you want to run?

3.50 28" 148mph @ 6500rpm here

jaywill

iTrader: (5)

110mph 1/8....6800

samdogmx

iTrader: (14)

4.10s would probably be ideal to hit 110 at 6800 in 1/8th

Id say stick with the 3.89 if you already have them, you should be just a little bit lower RPM

jaywill

iTrader: (5)

WheelsUp84z

iTrader: (14)

i went 124 with 3.08/28" tire. TH400 with 3800 stall. crossing at about 4800, was more-so setup for 1/4 mile and street driving.

MillsMotorvation

I would try what you got, and go from there. I had 3.08, 3600 stall but my car weigh 4000, and cross at 5900 rpm, I changed to 3.42 and I gained 4tenths, and rpm at 6200-6300. Small AR turbo like tall gears, large AR turbos seem to small gears. There still a lot more to consider.

stock48

iTrader: (17)

I've got 3.23's and 1.76 glide. Been 132 almost 133 in the 1/8 and 164mph 1/4 on rev limiter before finishline. With my looser high altitude converter and 28" tires it was right around 6800rpm at 1/4. Will be switching to 3.08's soon for 1/4 and 3.73's for 1/8 mile runs. We'll see what changes.

jaywill

iTrader: (5)

Good info...

Forcefed86

iTrader: (4)

Depends alot on your converter slippage as well. Id see 20%+ slippage around 6k on cheap converters. Around 4-6% With the nice units...