Searching for manual transmission!!!

[Nightriderv8]

Hey guys,


I 've got a LT-1 year 93 with a automatic transmission Th-700.

I'm looking for an alternative manual transmission, is there anyone who has some experience with this?

Which manufacturer offers manual transmission for my corvette?

I'm looking forward for your answers.

 

[Hib Halverson]

The factory six-speed back then was the ZF S6-40. They can be had on the used market along with all the parts necessary to install it.

You'll also need to change the rear drive axle assembly to a manual trans rear end.

Considering the cost involved in converting, you're better to sell your 93 automatic and find a use, late C4 with a six-speed.

 

[Nightriderv8]

Thanks,

The ZF S6-40 is very expensive i know this. I'm coming from Germany and screw for myself.I'd like to change the manual transmission in my own work.


Do you have some more examples for manual transmissions that are not such expensive?

 

[kpic]

You could check this site out for ideas.

Products - Rockland Standard Gear, Inc.

However, price + shipping + import taxes :ugh

These are also interesting:

General Motors transmissions

General Motors transmissions

 

[Hib Halverson]

The only other manual transmission which fits and is even close to being easy to install in the vehicle is the Richmond "ROD" six-speed. Richmond sells a kit designed to replace the 4+3 manual trans used in 84-88 Corvettes. It is likely that same kit could be used to replace a 4L60 automatic in a 93, but you'd have to purchase a number of additional parts to convert from the automatic to the manual including a manual trans rear drive axle and a manual trans C-beam.

Information about the Richmond can be found here:
6 Speed - ROD - Richmond Gear

and here:
http://www.richmondgear.com/pdf/RG21.pdf

The Tremec six speeds cannot be used without a great deal of custom fabrication work.

Good luck.

 

[hcbph]

Here's some additional info: Silver Sport Transmissions - The Powertrain Specialists
IIRC Silver Sport bought out the resources of Keisler and is selling kits again.

Happens I have a 86 L98 that the 4+3 was replaced by a Tremec TR3550 before I bought it. It's pretty much a direct replacement from what I can see. I'm sure there could be something for a LT1 also, whether Tremec or Richmond.

I know there are others that have converted an automatic to a manual shift. From what I remember you'll need a clutch pedal, master and slave along with hydraulic lines. A new bell housing, clutch, transmission, c-beam, transmission hump, wiring and maybe the ecm, gear ratio change to name a few of the things I believe will need to be modified or changed.

 

[kpic]

What is done to a Tremec T56 to increase torque capacity is replace a lot of parts and also bearings. For example, the main shaft is swapped for this:
Tremec #23 Mainshaft (Viper) - Tick Performance, Inc.

The major difference with the main and counter shafts are the standard T56 shaft has two fillet radii generated by the cutting (hobbing) process where the spline involute form or sides of the spline meet the base circle. This sorta elliptical shaped radii are stress points where higher torque levels can break a tooth. The shaft at the link has a full radius which lowers stress. There are also tricks which can be played with the pressure angles. Add changing to "fancier" steels and Heat Treat processes etc. and you have an increased power rating.

Next is the diff, drive line, clutch etc.

Years ago, an I-6 could be replaced with a 400 HP engine and the transmission would live. Back then, the design engineers lacked the analytical tools we have today so they overbuilt. Materials were cheaper and the list goes on and on.

With a software called Ansys, we can analyze a lot closer. It isn't being "cheap." A vehicle is sold with a transmission rated at a certain torque rating and a safety factor. If an engine makes 380 pounds of torque putting a 600 pounds of torque transmission and diff there is a waste of the company's money.

This is all kinda of deep and reminds me of work.

 

[Nightriderv8]

Ok, thanks for the informations.

The ZF S6-40 ist the best decision.


But do you know a Site which sells needed ZF's?

And they ship it to Germany?


thanks!