Is there a manual 6sp conversion?
Supporting Vendor
Joined: Apr 2014
Posts: 254
Likes: 23
From: Maryville TN
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Jeff Kauffman
VP Sales and Marketing
Silver Sport Transmissions
2250 Stock Creek Blvd.
Rockford TN 37853
jeff.kauffman@shiftsst.com
Authorized TREMEC Elite Distributor
Jeff Kauffman
VP Sales and Marketing
Silver Sport Transmissions
2250 Stock Creek Blvd.
Rockford TN 37853
jeff.kauffman@shiftsst.com
Authorized TREMEC Elite Distributor
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Depends on a what you need/have now (motor configuration, rear gear)
Many cases a 5 spd works fine, can almost never use 6th.
Sure SS trans can help you make the right decision
Many cases a 5 spd works fine, can almost never use 6th.
Sure SS trans can help you make the right decision
Supporting Vendor
Joined: Apr 2014
Posts: 254
Likes: 23
From: Maryville TN
We're happy to discuss TKO vs. Magnum by phone, give us a call anytime. Long story short...
TKO provides up to a 36% rpm drop.
Magnum provides up to a 37% rpm drop. A 50% overdrive is optional but it rarely works with classic cars since its simply too much overdrive.
There are installation differences, functional differences and parts required to install them are different.
Bigger/More is not always better and we can help you decide. Either way, it will be the best upgrade you will make to your Corvette.
Jeff Kauffman
TKO provides up to a 36% rpm drop.
Magnum provides up to a 37% rpm drop. A 50% overdrive is optional but it rarely works with classic cars since its simply too much overdrive.
There are installation differences, functional differences and parts required to install them are different.
Bigger/More is not always better and we can help you decide. Either way, it will be the best upgrade you will make to your Corvette.
Jeff Kauffman
Burning Brakes
Joined: Sep 2017
Posts: 1,219
Likes: 365
From: Tolland CT
I am doing a 6sp conversion in my project simply because it fell into my lap at a price that I could not walk away from, otherwise I think I would be perfectly happy with the 5sp swap.
Either way, SST is the way to go for parts or a complete kit.
Either way, SST is the way to go for parts or a complete kit.
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
I heard c4 trannies were too large for c3 tunnels, and junk to boot. The t56 from 94-up v8 camaros-firebird fit but take a lot more doing to install and cost lots more than the t5 that is fairly common and reasonable.
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Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
The early C4 had the 4+3 transmission which was a joke. The later ones had a ZF 6 speed which is huge and will not fit without tunnel mods. The T56 just fits in there. It is tight but fits and you will definitely need a removable crossmember. The T5 is ok for very low HP cars but if you plan on much over 300 HP the T5 if driven hard will lay its gears on the street. The TKO is the way to go for a 5 speed. T56 requires a little more work but does fit in with some mods. I have had the TKO in mine now have a T56. I have also installed about 10 or so TKOs in forum members cars. Well worth the time and effort.
Last edited by Gordonm; Feb 5, 2018 at 06:51 PM.
Instructor
Joined: Oct 2015
Posts: 189
Likes: 24
From: Herndon VA
Like others have said: Silver Sport Transmissions
Have their T56 Magnum kit with hydraulic clutch and couldn't be happier. They even swapped out the 5th and 6th gears in house so I could have the gearing I was after.
Have their T56 Magnum kit with hydraulic clutch and couldn't be happier. They even swapped out the 5th and 6th gears in house so I could have the gearing I was after.
Burning Brakes
Joined: Apr 2013
Posts: 1,194
Likes: 109
From: Las Vegas NV
I only use 6th on mine when cruising 80mph+ or downhill.
I could live without the 6th but I like that it is there when driving out of town. Around here out in the desert everyone is going 80-90mph.
I'm running a '97 Camaro T56 with the .5 6th OD and a 3.36 rear gear...and was sure to pick a cam with more torque than not.
100mph is 3,000rpm in 5th and 2,000rpm in 6th.
I could live without the 6th but I like that it is there when driving out of town. Around here out in the desert everyone is going 80-90mph.
I'm running a '97 Camaro T56 with the .5 6th OD and a 3.36 rear gear...and was sure to pick a cam with more torque than not.
100mph is 3,000rpm in 5th and 2,000rpm in 6th.
Advanced
Joined: Jun 2014
Posts: 50
Likes: 13
From: Valley of Cumberland, PA
Absolutely!
Whether you get the 5 speed or 6 speed, get it from Silver Sport Transmission.
I bought my TKO600 from Jeff at SST and the product and customer service are both outstanding. Jeff answered all my questions and the complete kit arrived with everything I needed to install the transmission.
I parked my car at their display on the midway at Corvettes at Carlisle last year and I was able to get to know the owner, Jack Silver, a little better.
I can confidently say you will not find very many people who are as dedicated to delivering a top notch product with impeccable customer service.
Whether you get the 5 speed or 6 speed, get it from Silver Sport Transmission.
I bought my TKO600 from Jeff at SST and the product and customer service are both outstanding. Jeff answered all my questions and the complete kit arrived with everything I needed to install the transmission.
I parked my car at their display on the midway at Corvettes at Carlisle last year and I was able to get to know the owner, Jack Silver, a little better.
I can confidently say you will not find very many people who are as dedicated to delivering a top notch product with impeccable customer service.
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
Here is my install.
My car is mostly used for track days. 3.08 Rear diff with a .62 6th which I regularly use driving to the track 70MPH which is great. It is not a passing gear, but cruises just fine @ 73 MPH (1800 RPM)
https://www.corvetteforum.com/forums...-corvette.html
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
I'm not sure what benefit the extra gear would be for you. An 'under-powered' car would benefit from it by keeping engine in power band better. A C3 with plenty of torque has little need of that.
If you could go 150+ mph on U.S. highways, the 6-speed would be useful.
Maybe if you were doing salt flat speed runs....
If you just WANT ONE....go for it!!
If you could go 150+ mph on U.S. highways, the 6-speed would be useful.
Maybe if you were doing salt flat speed runs....
If you just WANT ONE....go for it!!
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
Isn't the goal to run less than 2000 RPM for highway driving ?
My C6 2010 GS runs ~ 1400RPM on the highway.
Nothing wrong with this setup ?