Anyone using a 6 spd auto?
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Ill get bored and change it back eventually
Racer
Joined: Mar 2003
Posts: 346
Likes: 33
From: OKC OK
both US Shift & Compu Shift have GM 6 spd support "coming soon". US Shift does work on the Ford 6R80 which does you no good, but at least they are making progress for hot rodders. So a factory computer is the only option until who knows when.
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
sounds good as long as driver can control
all shifting.
driven an eight speed that does not allow
any driver selection. sucks
all shifting.
driven an eight speed that does not allow
any driver selection. sucks
Last edited by calwldlife; Jan 10, 2019 at 08:29 PM.
Instructor
Joined: Apr 2006
Posts: 123
Likes: 103
From: Abingdon Maryland
I have a 6L80 with an LS3 in my 73 vette. It does shift early at part throttle but you can set it to shift when ever you want with HP Tuners, I increased mine 4 mph in the first three gears and its better, might increase a little more. I can't do WOT from a stop there is no traction, getting drag radials this spring.
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Are you using an LS computer or is there some standalone system for the trans? I dont know much about that stuff but curious.<br />A nice converter with lockup, deep gears I think would be killer and put some fun back in the auto .I plan on keeping the 6 spd for awhile but may just swap an auto later on if I put this one back to DD status .<br />ALl the yrs this ones sat around what a waste. Gotta use them up thats what they are for<br /><br />Im sure with Drs they would spin bad but thats ok. The T350 was boring and dont like the gear spread in the 700r the way this ones cammed.
Googled this, sounds like a riot
Googled this, sounds like a riot
https://www.google.com/search?client=firefox-b-1&q=6l80e+ratios
THanks. Guessing I wouldnt need a 45-5000 stall like I would a 3 spd auto, something much smaller should work?
both US Shift & Compu Shift have GM 6 spd support "coming soon".
Last edited by cv67; Jan 11, 2019 at 07:07 PM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
If you have an engine with a wide power band, you don't need a 6 or 8 speed transmission. But, newer engines, which only make BIG power in the upper RPM range, require that many trans ranges to keep the power up. Sticking a 6-8 speed auto behind an 'old school' C3 engine is mostly a waste of money. You might be able to brag to your friends about having that trans in your car: but if you couldn't beat 'em before, you still won't get 'em with that new tranny.
Instructor
Joined: Apr 2006
Posts: 123
Likes: 103
From: Abingdon Maryland
Engine and trans came from a 2011 Camaro. Originaly an L99 conveted to LS3. Useing original computors, engine and trans with a PSI conversion harness Street and dyno tuned using HP tuners.
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Thread Starter
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
not an old C3 but an old school chevy same thing, lotsa carbed guys so I hang out here.
Peaky powerband, with gears/converter and a controller I think it could work.
Took it out for awhile last night, going to change shifters first. Love the manual and direct power but the sometimes notchy sometimes not is driving me up the fn wall.
Peaky powerband, with gears/converter and a controller I think it could work.
Took it out for awhile last night, going to change shifters first. Love the manual and direct power but the sometimes notchy sometimes not is driving me up the fn wall.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
If you have an engine with a wide power band, you don't need a 6 or 8 speed transmission. But, newer engines, which only make BIG power in the upper RPM range, require that many trans ranges to keep the power up. Sticking a 6-8 speed auto behind an 'old school' C3 engine is mostly a waste of money. You might be able to brag to your friends about having that trans in your car: but if you couldn't beat 'em before, you still won't get 'em with that new tranny.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
The extra gears make for a smoother driving experience too.
One interesting thing about the 6L80e gear ratios is that there is no 1:1 gear ratio. The 4, 8 and 10 speed auto's from GM all have a 1:1 gear ratio.
Controllers do exist - TCM-2650
I think GM might have something too.
One interesting thing about the 6L80e gear ratios is that there is no 1:1 gear ratio. The 4, 8 and 10 speed auto's from GM all have a 1:1 gear ratio.
Controllers do exist - TCM-2650
I think GM might have something too.
Burning Brakes
Joined: Apr 2013
Posts: 1,072
Likes: 61
From: Saint clair shores Michigan
I have a 383 in my 77auto.with a .336 gear in the back. I have a 350th trans that's built with the heavy duty cluches, shift kit and 3500 stall. At 70 MPH, my tack is right on 3000 rpms. I burning gas like there's no tomorrow. So it seems like I could really need a six speed auto. ??
