Transmission upgrade?
Thread Starter
Instructor
Joined: Apr 2015
Posts: 196
Likes: 26
Transmission upgrade?
1971 LS-6, over 600hp. The Muncie is not cutting it. I'm running 355's in the rear and at 70 its turning about 3000 rpm. Is a five speed my only option? what would be the cost on a TKO five speed out the door.
Thanks, John.
Thanks, John.
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
Hold out for a 6 speed conversion. This is a email I got from Silversport
Note the 6 speed conversion kit coming soon ?
http://campaign.r20.constantcontact....6-d4ae5292b9a6
I did a 3 speed auto to a Tremec T56 Magnum this last spring.
I used parts from a number of vendors with a few mods. The 6 speed (T56 Magnum) rated at 700 ftlbs will be a good fit for your engine.
https://www.corvetteforum.com/forums...-corvette.html
Race Director
Joined: Apr 2015
Posts: 17,571
Likes: 3,460
From: Fresno California
A much cheaper and easier option is to swap the 3.55's for some 3.08's. With your power and torque, you don't need a steep rear gear. 3.08's will put you right where you want to be in pretty much any driving situation.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Burning Brakes
Joined: Oct 2002
Posts: 914
Likes: 14
From: Aberdeen, Scotland
What about a rebuild of your transmission with M-22Z gearing? Then you can run a 3.08 or even a 2.73. With that power and torque it should be no problem. cheaper too!
Check out Jody's Transmissions. I was thinking of doing the same in my build BBC
Check out Jody's Transmissions. I was thinking of doing the same in my build BBC
Drifting
Joined: Oct 2012
Posts: 1,524
Likes: 61
From: Medina Ohio
TKO 600 max torque is only 600 ftlbs. T56 Magnum is 700.
Hold out for a 6 speed conversion. This is a email I got from Silversport
Note the 6 speed conversion kit coming soon ?
http://campaign.r20.constantcontact....6-d4ae5292b9a6
I did a 3 speed auto to a Tremec T56 Magnum this last spring.
I used parts from a number of vendors with a few mods. The 6 speed (T56 Magnum) rated at 700 ftlbs will be a good fit for your engine.
https://www.corvetteforum.com/forums...-corvette.html
Hold out for a 6 speed conversion. This is a email I got from Silversport
Note the 6 speed conversion kit coming soon ?
http://campaign.r20.constantcontact....6-d4ae5292b9a6
I did a 3 speed auto to a Tremec T56 Magnum this last spring.
I used parts from a number of vendors with a few mods. The 6 speed (T56 Magnum) rated at 700 ftlbs will be a good fit for your engine.
https://www.corvetteforum.com/forums...-corvette.html
The 600 TQ comes from SUSTAINED testing, and as most manufacturer specs I assume is a SAFE number. Not many motors are going to hold that kind of TQ through the curve, rather peak for short times where the TKO will handle fine.
Either the 5 or 6 speed is a good choice. Make sure to calculate ratios with your rear gear to decide what suits your needs. The 5 speed has the same 1-4 with either a .63 or .82 OD. The 6 speed, I believe, comes in a wide and close ratio combination.
I pieced my "kit" together, but I think if you buy the ready to go TKO package your looking at around $4k
Last edited by Ibanez540r; Sep 7, 2015 at 03:12 PM.
