Turbo 350 or 400 which one and why?
Thread Starter
Joined: Apr 2002
Posts: 5,231
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From: Houston TX
Turbo 350 or 400 which one and why? 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
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
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.
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.
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.
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From: Gainesville, Florida # of drag strips runs: ?!?!?
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.
Derek
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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
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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
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
