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Which gearbox?
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 |
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).
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Which gearbox?
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. |
Toploaders are bullit proof.
But if you"must have" a 5th gear go with Tremec. The Tremec is an easier"fit". |
Which gearbox
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! |
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