Manual trans behind a 460

xlr8tr · #1 (**permalink**) 10-29-2015, 11:08 AM

hopefully not a hijack of the thread, but I'm looking at a different option: I have a straight axle 4 link suspension, so if I want to go with a 5 speed anything longer than a toploader will not work (leaves me with no rear suspension travel as the driveshaft gets too short).

Looked at G-force transmissions, they show a 600hp capable T-5: here's from their website: G-Force Transmissions and Long Shifters

Generally, it can be assumed that with the available upgraded mainshaft, the G-Force Street 5-Speed kit will handle roughly 600 hp or 500 ft-lb. of torque in a 3300 lb. vehicle running drag radials at the track with a moderate clutch upgrade.

Anyone have any thoughts on this option? I'm running a 460, havent dyno'ed but I'm guessing somewhere close to 500hp flywheel.

Similar option available from Promotion Powertrain, MUSTANG/CAMARO Performance Manual Transmissions/Clutches/Repairs/Parts/Gears FL

blykins · #2 (**permalink**) 10-29-2015, 11:10 AM

That G-Force T5 won't last behind a big block, even if it's rated for 600 hp. Astro Performance offers a 550-600 hp T5, but the owner has told me himself that they just won't handle big block torque.

I'd go with a TKO 600 and not think twice....it's not longer than a Toploader.

MAXVELO · #3 (**permalink**) 10-29-2015, 11:21 PM

Sorry blueblood, didn't mean to bore you with my junk boat anchor of a worthless $6k tranny! Aparently blykins knows it all. I mistakenly thought you were merely asking what setup people had behind a 460. My wife and I like to go on weekend road trips and I thought a 6th gear might do a little better on the highway since I'm running 4:56 gears. But according to blykins, there's no need for a 6th gear so, my bad, I'll just mind my own business .....

blykins · #4 (**permalink**) 10-30-2015, 05:15 AM

Quote:

Originally Posted by MAXVELO

Sorry blueblood, didn't mean to bore you with my junk boat anchor of a worthless $6k tranny! Aparently blykins knows it all. I mistakenly thought you were merely asking what setup people had behind a 460. My wife and I like to go on weekend road trips and I thought a 6th gear might do a little better on the highway since I'm running 4:56 gears. But according to blykins, there's no need for a 6th gear so, my bad, I'll just mind my own business .....

Didn't mean to put a bee in your bonnet, but he was asking for help and opinions. As an engine builder and Tremec reseller, I've been through this dialogue with literally hundreds of people, and have received feedback from the guys with 6-speeds and the guys with 5-speeds.

There's a lot to consider when you switch to a T-56 and obviously, as you mentioned, 4.56 gears is one of them. The other things to consider are the price (big $$$ upgrade), if it will physically fit in the trans tunnel, and if you actually have room on some replicas for any kind of driveshaft whatsoever. When you tack on the extra length, the driveshaft gets really short and that's not a viable situation for a solid rear axle car.

I'm certainly entitled to offer my opinion as well and I have just never came across a situation where a T-56 was the better choice.

xlr8tr · #5 (**permalink**) 11-01-2015, 12:09 PM

Quote:

Originally Posted by blykins

That G-Force T5 won't last behind a big block, even if it's rated for 600 hp. Astro Performance offers a 550-600 hp T5, but the owner has told me himself that they just won't handle big block torque.

I'd go with a TKO 600 and not think twice....it's not longer than a Toploader.

Thanks!! I had thought TKO600 was longer for some reason...