Which gearbox?

[simonjrwinter]

I've just bought a 408 stroker to fit in my next project. It's producing 490 BHP and 480 ftlbs of torque.
What's the best gearbox to use?
It has a centreforce clutch.
I'd really like a 5 speed, but have been advised to stick with a toploader.
Any advice?
Thanks
Simon

[BevanWright]

For a road car I would go with a T56 - six speed - very nice gearbox. I have one behind a 4 litre Turbo six (around 350 hp) - excellent close ratios. They also come in the Pontiac GTO, but with different ratios (taller overdrives).

[Ant]

What about this T56

http://www.g-forcetransmissions.com/tran_gt-56.asp

Rated at 900 horsepower and 800 ft-Ib of torque, almost straight cut gears, changeable triple cone syncos, and you dont have to change your rear end ratio for race days. What I like is the 0.86 fifth and 0.75 sixth options, this makes a close ratio, for my app with higher revving Nascar type engine a 4.10 final drive ratio is in order which gives me 180mph at 7000, and 2300rpm at the speed limit!

Rockland Standard Gear make several versions
for the Corvette, Mustang/kit cars and Viper, the Viper trans has about the best shifter position compared to the original TL, the rest are to far back.

[Cobrabill]

Toploaders are bullit proof.
But if you"must have" a 5th gear go with Tremec.

The Tremec is an easier"fit".

[Ant]

The Tremec TKO has a reasonable first gear and overdrive, and is great for a road grunt engine Cobra, but I wouldnt consider one for a higher revving smallblock or a big block for a start they have crap ratios, big gaps, and I wouldnt like to put 650bhp through one, but on the other hand the same coy makes the T56, and these are considered to be weak in the mainshaft, so I dare say if you uprate the mainshaft to 30 or 31 spline they are great!

I think I am at the top end of the scale as far as horsepower goes so I dont want to do it twice so the T56 G-force will do it, I had a Jerico on order but commonsense prevailed and I have gone for a synco box as a compromise!