DopeFedZ

iTrader: (34)

Sup guys need expertise from the pros I am looking to get rid of the 4L60 since it's definitely not holding up anymore and this one is number 4 or 5. I'm trying to decide between a 350 and 400. From what I've gathered the 350 is lighter and doesn't eat up as much power as the 400 but apparently it's weaker? Will a 350 hold on a 408 with a 300 shot reliably?

I do like driving my car on the street and usually put about 200 miles a week on it if not a little more but I don't mind losing the OD if the transmission is gonna hold. My car is 3560 with me in it and I've been using a 27" drag radial if that matters.

I had a 350 in my Z28 and didn't have an issue with it even on the gas but the car was about 500lbs lighter.

Any help, input, or opinions are welcome.

Carlos

94Z28rag

iTrader: (10)

400. Do it once.

BlackScreaminMachine

iTrader: (17)

One of the biggest issue I have seen with a TH-350 that they tend to get cranky when running a Trans Brake. Seemingly something to be concerned about. Like said, do it once and in MOST situations a stock or even BEEFED up TH-400 will handle everything you could ever throw at it.

tim99ws6

iTrader: (31)

Carlos,

Had a beefed up TH350, and it did alright for a year and was trouble free, but ended up splitting the case on it at the shootout. How heavy is your car?

tee-boy

iTrader: (8)

350 for a little extra ET
400 for longevity

clutches on a 400 are a lot wider than clutches on 350 (more grip surface for higher hp).

tektrans

iTrader: (23)

My 350 has been great over the years. On the transbrake, off the footbrake, I think it has alot to do with who builds it. I've never had it rebuild, freshened up, nothing.
408 on a 300 shot, looking at what? 900 crank horse. I'd say you'd be pushing the limit of a 350. Go with the 400.

Villain281H

iTrader: (5)

X2. I ran a TH350 for years, even into the mid 10s with a 120 shot, but as soon as I wanted a transbrake, it was TH400. I heard too many horror stories about t-brakes on TH350 transmissions (but as mentioned, can be who builds them). The TH400 does eat a tad more power but works well everytime for me

Derek

INTENESS

iTrader: (4)

I'm running a th-400 and my acr is similar set up to yours and it has been taking all that I can throw at it.THough im only hitting with 150 shot.Th-400 didnt eat as much hp as I thought it would.Also make sure you a scatter shield blanket for the trans and I recommened reverse manual vale body style trans

SSPerformance

iTrader: (76)

ive ran a th-350 in my bros car for years on the brake and never had any issues.

408 on 300 worth of n2o id deff for the th-400 . it will last a long time befor you have to do anythign to it