heavy duty transmissions

[seannz28]

my engine project is so close to being done, now I have to start thinking about a trany that will hold up under high HP and Torque. I wanted to go with a 6-speed, but as long as it is a stick shift.
I expect to push 450HP at the flywheel
and 480 lbs of torque (also at the flywheel)

Anyone know any good links or places to check?
I plan on spending about 2K on the trany alone.

[ninetythreez]

.

If you insist on using a manual shift, I would recommend a Muncie M21 or M22. Don't expect good gas mileage from either one though, but then again you are talking about a 450hp motor. The M21 is usually $300-500 and a M22 is usually $400-700. They are both strong and I have used them in high HP motors with success. The Borg Warner T10 is good but not quite as strong stock as the 2 Muncie trans. Also you will want to check driveshaft length, may have to have one cut to size. So this will all be appx. $850-1000. Muncies can be found locally, or www.mortec.com/, or eBay.

[Injuneer]

You can now get a bolt-up Tremec T56 for the Gen 1 SBC. The T56 is rated at 450 lb-ft from the factory, and has been used successfully by people making up to 750HP and far more than 450 lb-ft torque. If you need more strength, there are upgraded parts and o-treating available. There's a guy running mid 9's with a T56 in his 4th Gen.

If the price of a new T56 is daunting ($2,000) there are adapters available that would allow you to pick up a used LS1 version of the T56, and include an SFI-rated explosion-proof bellhousing from McLeod.