6 speed Manuel transmission
 

I have a stock1979 corvette and would like some input if threre is a 6 speed that drops in without modifications for my 1979 corvette. Thanks ahead for any input.

contact this company
https://shiftsst.com/

Check what rear end gears you have and research what your cruising rpm's will be using a gear calculator before you purchase.
Many members on the forum have found that sixth gear is not usable and have commented that they wish they would have gone with a five speed instead of a six speed trans.
Six speed gear boxes are larger and you may need to modify the trans tunnel to make it fit.
Silver Sport Transmissions sells complete kits and they can answer all your questions.

The Without Modifications is going to be the limiting factor.

I would be shocked if the T56 will fit without cutting the tunnel. The trouble with the new 5 and 6 speeds is that they are longer and much more square at the top of the trans. To make it fit with the correct engine angle you have to cut the tunnel. Not that big of deal really. Also the trans cross member will either need to be replaced or modified. I've both the TKO 600 and the T56 Magnum. The TKO was good but doesn't shift nearly as nice as the T56. There are a number of RPM calculators out there so you can figure out your rpm's in all gears.

If you can find a richmond 6-speed it is the same length as the muncie and you can bolt it in with minor mods. Of course, a removable crossmember is a lot easier; otherwise you just pull the engine and tranny and then reinstall together.

I heard the shifter is in a slightly different location.

Is that so?

Mine is pretty much in the same spot as the Muncie M-21 I replaced.

here. found a pic.
https://www.corvetteforum.com/g/picture/6185115

I just put a Richmond 6-spd in with my LS swap and had to do some minor changes because of where the LS is located, but it looks like it would have been a direct bolt in behind the old SBC.

Here is my T56 Magnum install notes. 78 Corvette. Started as a auto transmission.

https://www.corvetteforum.com/forums...-corvette.html

Manuel drives an auto, he no knows how to cheeft.

I have not been on here for a while, I love my t56 in my 69 vette ,if you drive one you will love it .no comparison to a 5 speed .

BUT; he has a stock 79. not quite the torque of a 30 over 502. i feel a 5 speed is much more appropriate for his engine. he will not be able to use 6th gear unless down hill on the interstate.

It looks like the 6 speed is no longer available.

Do you know how similar is it to the 5 speed?

with my t56 and a 370 rear end its fine, my vette has a 350 with about 370 hp , i will change rear to 411.

You're correct, the Richmond 6-speed is no longer available new. You would have to find one used, like I did, or go with the T56 or one of the 5-speed options that are out there.
To answer your questions about similarities, here's a link to a PDF that has dimensions and part numbers for all of the Richmond transmissions:
https://www.richmondgear.com/wp-cont...g_Section2.pdf

-Chris

theres options for the 6 spd..like z06 gearing which one day ill have and the not so tall 6th. 6th is just for cruising/mpg not really accelration.
A nice 5 spd is really all you need.

Yes, I noticed that that they'd quit making it. If you can find one though, it fits in the space that my Muncie M-21 fit in. I had to fabricate the tranny mount and stuff, but nothing too hard. I made my crossmember removable at the same time.

I really need to take mine out since it makes a racket at idle after it warms up. Seems to shift and operate quite well, but it sure get noisy, at idle, in neutral, when it warms up. I've had it for 20+ years so I guess I should get it fixed if I can find somewhere. Mine has a 0.62 overdrive and I bought the car with the 4.1 rearend....which is why I wanted overdrive.

I love the nonsense that you need a giant BB engine to utilize a 6 speed OD manual. NOT TRUE!

My 355 L-82 with AFR heads, roller cam and 10.2 compression can pull effortlessly with 3.70 gears and a 1:1 fourth gear below 1,000 RPM (700-800 RPM) with zero bucking from the engine/tranny. Any big V8 (a 350 is a big V8-BTW-5.7 Liters) can utilize a 5 or 6 speed OD with no lugging or bucking issues. Where does this stuff come from? Unless you have an engine with a cam operating range of 3,500-7,000 RPM an overdrive tranny should not be a challenge. A low torque 4 cylinder 1.8 liter engine is another story.