01FbTaWs6

iTrader: (12)

OK guys. Ive currently got a T56 in my car and am thinking of swapping to a TH400. My question is, who here is running them, with what stall and what rear gear, tire size, and what is your RPM at lets say 75 mph? I know they dont have any lockup, and that is my only worry. Ive currently got a heads/cam car (specs in sig) with a 4.10 gear, and plan to keep with this gear, and go to a 28 tall tire. Please, any info or recommendations are appreciated!!

2002CAMAROSSLS1T56

iTrader: (2)

At 75 MPH you'll be at 3899 RPM with 4.10's, 28" tires.

Rear gear x 355 x MPH / tire diameter = RPM

(FYI- 355 is for a high stall converter and unlocked, a lot of calculations use 336 but thats more for manual transmissions, locked up converters or stock low stall.) And for overdrives it's rear gear x OD ratio x 355 x mph / tire = rpm.

01FbTaWs6

iTrader: (12)

holy bajesus!!! No way in hell that right there would work.... Im thinking of going like a 3800 stall.

performabuilt

iTrader: (25)

Yes I think I spoke with you. If this car does anything other than race I would really consider either a 4L60E if under 600-700 hp if over and since your swapping anyway a 4l80e might also be a consideration.

Z28/2002

iTrader: (27)

I'm running a TH350 with 4.11s and a 27" tire. I'm at 3300 RPM at 65 mph

Raven02TA

iTrader: (11)

same here with my th400. but on 28" tire.... i think at 70 MPH im at 3500

98Camarod

iTrader: (43)

That's not too shabby

tals7

400th great for drag car but if drive on street you should look into 4l80/4l85e swap.the swap is easy a is money well spent .they are also just as strong as th400 but way better on street.

gator's 99TA

iTrader: (2)

i have a TH400, 325 radial (28") and 373 gear. i am at 3500 rpms at 70 mph and its pretty comfortable with a quiet exhaust. i never do more than 70 mph other than at the track or i get a hair up my *** and feel like hammering it.

99Z28LS1

iTrader: (4)

I agree with the above, If you're going to drive it everyday, the 4L80 would be the way to go.

I'm moving from a T56 to a th400, but my car will not be daily driven. I already have the th400, it has a 3200 precision stall in it. The car will be on a 28'' tire with 2.75's in the back. I'm going with a low gear because I will be running against bikes and what not on the highway.

y2kfrc

iTrader: (3)

Nice building a bike killer! pm me when you wanna test it out

CarsandWomen

iTrader: (19)

do keep in mind also that th400's are known for useing a lot power to turn themselves, on average 150 to 200 horspower.

an aquaintance had a 400 with a 3200 stall in an 04 gto with a 408, he drove it daily for a while, loud exhaust and all. after not long he hated it and just recently switched back to a t56. he was at roughtly 3000rpms at 65mph

built408

iTrader: (10)

I don't think a 400 eates 150-200 hp.

allbaugh_04

iTrader: (6)

I don't think a th400 would be all that bad, just don't put gears like 4.10s in your rear and you should be ok.

tee-boy

iTrader: (8)

TH400 for racing. No other reason to do it, unless you just want to save a bunch of money by not going 4l80e.

Plenty of TH400's in the junkyard.

CarsandWomen

iTrader: (19)

every one ive ever seen engine dyno and chassis dyno numbers for did. Thats allowing for rear end accesories. Its that high IMO. Its been my experiance they eat more power the more built up they become.

everything ive heard is they suck more power than most. really the only way to find out would be an engine dyno with a couple different trans behind it. my .2.

Built408, whats your estimate for their power consumption? Are you aware of their reputation for it? Not trying to be a dick, im looking for your honest opinion.

allbaugh_04

iTrader: (6)

Who cares, the gearing is better than the 4L60E anyways. You might not put out more hp, but if track times are what matters, then the TH400 is the way to go.