I have a 67 with a 700R4 does anyone know how to hook up the torque converter lock up thing on the transmission... i know you run like a ground and 12v but i dont know were to hook up the sender to tell it when to lock up, thank you

I have used several of the kits from BowTie Overdrives for Converter Lock-up.
Here is the link to the instructions on their site - http://www.700r4.com/tech/tcc/internal_install/2004r.shtml
I could find the kit parts and make it work - but, these can be touchy transmissions at times and I feel better useing the kit for them.
Last kit I bought was @ $80.oo.

Click here (http://www.tciauto.com/instructions/376600_inst.htm) for instructions on the TCI lockup kit. I have them for $75 if you are interested, as compared to Jeg's cost of $76 plus their "handling" charge, lol.

There are also what is know as hydraulic lockup valve bodies too. I recently pulled the pan on mine and found it had all the pressure switches, but no wires. The TCC solenoid was installed, but the wire to it was cut. The TCC solenoid also had a rubber ball stick in it to block fluid.

I later found out (after calling the builder) that they had put a hydraulic lockup valve body in it. They said they often do that to early model vehicles without the proper electronics.

The advantage of a hydraulic lockup is that it is set to engage between 3rd and 4th gears. With an electronic setup you usually use the 3rd or 4th gear clutch switch which means the TCC locks up on top of the gear.

The disadvantage of a hydraulic system is that you can't disable it electronically at will.

I don't know if your unit has a manual valve body or not. There is a way to tell by looking. If you find nipped wires and a plugged solenoid, yours might be configured the same.

Originally posted by Oldani Motorsports:
I have them for $75 if you are interested, as compared to Jeg's cost of $76 plus their "handling" charge, lol. :( Steve - my apolgies for not recommending a fellow TCer for parts and info graemlins/clonk.gif

I think of you as the PG/350 expert and forgot you work on the OD's also...

I will try to remember that - but, I'm getting old... graemlins/waving.gif

John

Thanks, and no big deal. This trans stuff is secondary for me, I keep pretty busy as the service manager at an RV dealer M-F. I do try to stick to building the GM 2 and 3-speeds just from a time constraint, but will sell parts and converters for just about any auto trans out there, and 99.9% of the time can save guys money compared to the big mailorder places. Plus, I enjoy giving tech help and seeing someone resolve a problem and run better with their car!

what would happen if i didnt put the lock up switch in... and just had it not lock up in 4th... is that ok?

I don't know if it will damage the trans or not, but in my opinion it's a great feature to have on a street driven car, and you'd be wise to take advantage of it.

Damage from overheating "may" occur if your engine RPM is below the torque converter stall speed for an extended time. As in cruising down the Interstate at 1500rpms with a 2000 stall, the converter will be slipping and building up heat. There has been much discussion and debate on this topic. Do a search and you'll get plenty of reading material.

Some 700R4 transmissions had a lubrication problem. When the TC was disengaged there was inadiquate oil flow to lubrication passages. This was fixed at some point but I don't know specifics.