i need some help i havent been able to find some good 6 speed trannies . can u send some links im lookin for a tranny that can handle some power.

 

how about a 6speed that can handle 650lbs of torque

http://www.ddperformance.com/GM%20T56.htm

 

Not an ideal swap trans IMO. Yes it is brutally strong, but this trans is meant for retrofitting into early musclecars. This is the trans that Mark Stielow has used in his past three or four 1st gen Camaros. It's great for those applications, but a 3rd gen swap would be difficult because of the specific nature of the trans. If they made that same trans for an LT1 application it would be ideal. Also, keep in mind that a regular LT1 T56 is rated to 450 lbs/ft of torque. That's a lot.

 

You can get that same trans in LT1 form from D&D or from Rockland Standard Gear (they rate theirs @ 750hp but have pretty much the same upgrades done). Both are upgraded with the 30 spline Viper Output Shaft and the better blocker rings and syncro's. Since I already have a T56, I'm sending mine in to be rebuilt with the upgraded parts. That's $1400 + shipping on top of what I've already paid for my tranny.
Since you haven't bought one yet, I'd call D&D and Rockland to see what they can do for you. Just ask for a Bulletproof T56 to fit a 93-97 Z28.
http://www.ddperformance.com/t56_partsupgrades.htm
http://www.rsgear.com/RacePerformancefiles/frame.htm

ALSO, with McLeod's release of their modular bellhousing system, it allows you to use a better Borg&Beck style clutch instead of the LT1/LT4 style.
http://www.mcleodind.com/cgi-bin/fcc...ostname=MCLEOD

 

That's a hefty chunk of change. I think I'd use G-Force's T56 guts before I'd drop that kind of change. I do all my own labor though, so that's never a factor for me. Even if you just buy one built like that it's still about $800 more than a brand new LT1 T56, which brings me to the following question:

Do you really need all that beef is the real question? If the trans is going in a 350HP, or even a 500HP street car then a stock T56 in good working order is more than up to the task.

I can't say I agree that the Borg & Beck clutch design is better than the standard LT1 diaphragm style. There was a time when that was true, but with the improvements in clutch material over the years the Borg & Beck stuff has become quite dated. Diaphragm clutches are smoother on the street, and easier on your leg or your hydraulic system. People are routinely using them in 700+ HP cars.

That modular bellhousing is amazing though. At some point I want to use it to stick a T56 behind a 428SCJ Ford FE motor. I don't think that's been done yet! It really opened up the market for all makes and models to use the T56.

 

I didn't know GForce made kits for the t56. I checked it out and I think if you were to use their fully optioned kit with the Moly input shaft, nickel gears, & triple cone sycro's with the D&D or RSGear Viper tailshaft conversion.....You'd have a hard time tearing up a T56.
You're talking about a BIG chunk o' change though!
http://www.g-forcetransmissions.com/tran_gt-56.asp

I don't know what his plans are, but I'm putting together a 500-525 horse 383. Eventually I'll add a blower (which could easily put me at 700-800 hp at the crank). With my current setup I need to upgrade my t56 anyways before turning it into a junkpile...so I might as well build it suitable for whatever the future brings. I don't know yet if the gforce parts will be an option, but I'm using the tactic of overbuilding the drivetrain in an effort to promote reliability.

 

That's the way I went too. I used the T56, so that the car is already set up for it. It's just a blueprinted unit now with the upgraded synchros. I know that if the turbo small block I've got planned comes to fruition I've got options to improve strength. G-Force just started making the T56 gears and shafts. I was psyched to see that. Their T5 parts are amazing and nearly indestructable.