Which manual trans for track car?

[jlwdvm]

I'm getting some research done on which parts to order for my 69 firebird project. It will be driven on the street, but I'm mainly building it to take to open track days and the occasional autocross. Track days will be spent on Autobahn's 3.6 mile full course. I'll be using a 500+ hp ls, all the Ride Tech goodies, Strange rear, etc. I drive a 2013 Boss at the track currently, so I am used to that trans and gear ratio (3.73) and I rarely get out of 4th gear with a 7500rpm red line. I need some input on trans recommendation, 5/6 speed, gear ratios, clutch, etc. Any info would be great!

[Flash68]

Primarily track car? Tex/G-Force or Jerico 4 speed I'd say. I love mine.

If it was primarily street with some track duty it seems like most are happy with the T56 Magnum.

[Sieg]

Originally Posted by Flash68

If it was primarily street with some track duty it seems like most are happy with the T56 Magnum.

Close Ratio

[jlwdvm]

It will see street time, but I don't expect any cross-country trips! However, if I don't buy a trailer it is a 2.5 hour drive to the track....thus the overdrive. Thanks for the info!

[TheJDMan]

You cannot go wrong with a T56 Magnum close ratio 6 speed. If you buy from Summit you will have it in a couple of days.

[71RS/SS396]

Bowler can build you a close ratio T-56 Magnum that has all the same parts that Tremec supplies to the Corvette racing team in the Rolex series, suppose to be good for 1,200 hp and 1,000 lb/ft of torque, which is what I'm running with 3.89 gears in the rear. This trans has a 2.29 first gear which is very nice for auto-x. 5th is .85 and 6th gear is I believe .67. I was able to muster 170 mph @7,000 rpm in 5th in the standing mile at the Sandhills Open Road Challenge.