New tranny

[Koll]

Well, summer is comming up and that means that hopefully a 454 (or 396) will be going in the Iroc. I doubt the 700R4 tranny can hold them so whats a good alternative? I still want to be able to use this on the street and have it be (if needed) an auto.

[78camaro]

700r4 can hold big blocks, allstar transmissions up north has built thenm to hold 800 hp, but if you'd feel safer throw a th400 back there

[Slow Z]

You'd spend several thousand on a 700R4 that *might* hold up to the power, or you spend a few hundred on a rebuilt TH400 that will take whatever you throw at it ...you make the choice

[Koll]

Ive heard that the T56 tranny works really good. Now granted its a stick, it seems like a viable option (considering I go to a junkyard and pay 500-1200 depending on what it comes with and cond.)

[JPSartre12]

There are a few ways to go.
A built 700R4 will cost you a small fortune, but allows you to have an overdrive gear.
A TH400 can easily handle the power for <$1000 but if you have a big gear in the car, you'll lose highway drivability. I have a TH400, high stall TC and 4.11 rear and I won't take it over 60 mph for more than a couple of miles.
My solution now is going to be putting in a Currie 9" rear with 3.70 gear and running tall tires on the street. That should ease my car's screaming on the highway. If not, I'll look into a Gear Vendor's overdrive unit. They're sweet, but cost ~$2k.