MUSTANGBRKR02

iTrader: (91)

I am going to be running a 28" tire and have two choices here. Either a 3.00 or a 3.25 ring gear. Car has a th400 rmvb and a TB. Running about 11-19 pounds of boost.

Thanks

kmracer

iTrader: (1)

weight rpm cubes? stock gearing in the trans? what do you wanna trap?

MUSTANGBRKR02

iTrader: (91)

Weight is roughly 3800. Motor is a 370CI. Stock gearing in the trans. I would like to come thru the traps at 140+ but haven't run the car yet so that will yet to be seen.

El_Diablo

iTrader: (9)

3.25 between the two.

needaz28

iTrader: (15)

3.25.. Im setting up damn near the same set-up.. except I have a shorted first gear in my th400.. I'm putting 3.08 gear in mine.

dschmittie1

iTrader: (64)

3.25 in my TH400 turbo car.

My buddy 1fastbird runa 3.25 with his TH400 and 402 with twins and has run a 9.1@156mph I think

kmracer

iTrader: (1)

either will work, but the 3.08 will calm the car down off the line more, thats gonna be about the only difference.

Sluggish

iTrader: (10)

145mph will only be 5700rpm with 3.25 gears. I would(and am) go with 3.50 with a 28" tire. It's enough gear to go 165 @ 7000rpm.

98Z28CobraKiller

iTrader: (17)

Your calculator is a bit off. I have a 3.54 gear and trap 152 @ 7200 with a 28" drag radial. With a stick shift car or a lock up converter maybe but a converter is going to slip a bit up top.

Mattsv8

iTrader: (7)

id say 350 gr. no transbrake ur gona need the little extra gear to keep the 60ft. evan with a brake id still think a 3.50 would be plenty. my budie is running the 3.50 gr 28" th400 combo arround 650whp and works great with a lot of gear left. turbo as well just not turned up the boost cause hes on the stock bottom end.

Sluggish

iTrader: (10)

Yea I didn't think about slip.

workin2hard

I went with 3.00 gear and 28" in my 640rwhp TA and it was almost to much gear.... You need to account for what trap speed you will run, tire size, motor rpm, weight, converter slip, trans gear ratio, ect... ect....