The GM T700 / R4 auto transmission & Trans Shifter
I'm using one of these auto transmissions in my 1930 Ford coupe Rod, behind a 350 Chev. and it seems there is a lack of information and a certain amount of mystery on using them in this application. I'm certainly not going to tell you what to do here (because I don't know either!) except to point you to some information which I have gleaned from here and there. I will add to this page as I find out more. Tell me too if you can help.

In my application, I'm using a 29" tall rear tyre and a 3.5 diff ratio and this calculates out to about 1850 rpm at 100kph (~62mph) which seems a pretty good compromise.

I plan to use a speed based lockup system for the convertor, based on my own design electronic circuit.

A more simple system can be derived by using the 4th gear output signal fro


Aug 2003

m the transmission to lock the convertor, with an over ride when the brakes are used. This is a fairly common system used in some aftermarket lockup kits, which only requires a relay and some wiring.

Some other kits sense engine vacuum.

No guarantees are given or implied as to the suitability of this material for any purpose whatsoever.

Try these links for some good information:- NEW Aug 2003


The July 2000 issue of American Street Rodder magazine has a very good article on setting up the TV cable.

(See also the /700R4p1.html link above)

Updated August 15, 2003
Email me if you have more info

I can't vouch for the following information but it might be worth checking out:-

Note: When searching for a 700-R4 for use in a conversion, remove the torque converter, and look on the front plate inside the bell-housing for the casting number. Get one with the last three digits being 732. This ensures a '87 or newer unit with the best of GM's updates.

I decided to make my own Trans shifter handle after pricing a Lokar one, imported from the USA. With our exchange rate, Ifigured I had nothing to lose, to try making my own.

The handle and lifter where turned from round pieces of aluminium and the shaft is made from 1/2" 316 stainless steel tube. A local Commodore (GM) gave up its shifter mechanism which was modified to take the new handle and shaft. The inner rod from the GM shifter was re-used.