How would you wire up the tcc to engage if you don't have an ecm anymore? I see thise kits for it, but $80 is a little steep for some wire ans switches I could make myself.
ANy Ideas would be great, thanks...

 

This assumes the wiring harness wasn't completely butchered when the ECM was taken out, and the internal wiring of the transmission is correct for your year of car.

Some things to consider:

<OL>[*]The TCC should be locked up in 4th gear.[*]F body 700R4s have a pressure switch inside which internally grounds pin "B" on the TCC connector when the transmission is in 4th.[*]The TCC will lock up when pin "D" is externally grounded.[/list=a]

Hmm... interesting, don't you think?

Leave the factory TCC harness plugged in, make a connection between the wires to pins "B" and "D" on the TCC connector. When the transmission shifts into 4th, pin "D" will be grounded through pin "B" and the 4th gear switch inside the transmission, and the TCC will lock up automagically.

 

Thanks, unfortunately, the only wiring i haave hooked up to the transmission is a 3foot pigtail for the connector. The previous owner really didn't like the ECM for some reason.

 

No problem then, do you have all 3 wires on the pigtail? Join the "B" and "D" wires together. Take out the driver's side under dash panel and find the switch on the brake pedal with one purple wire and one pink wire with a black stripe. Connect the purple wire to the "A" pin on the TCC connector and everything should work.

 

Ok, I don't mean to get annoying, but I looked and there is no switch anymore. Is there any way I can just hook up a manual switch like just for the highway?
Thanks a lot for the help so far.

 

This is exactly the answer i was looking for... I've been trying to find a way to get lockup in 4th gear only, without shelling out the $$$ for a vacuum operated switch - (read: cheap bastard).

So, if i'm understanding correctly i can simply solder a jumper between wires "b" and "d", outside of the transmission... And get automatic lockup in 4th gear? Without ever having to drop the pan?!?

Hellraiser

 

Here's what I did. Starting with a core trans.
Find a two prong normally open pressure switch and put it in the fourth gear pressure switch port. Pick a wire from the harness coming into the pan and run it from a key on positve 12 volt source to one prong on the pressure switch, connect the soliniod to the other prong on the pressure switch. Make sure the soliniod is grounded, there are two types--one wire and two wire. One wire types are self grounding and two wire types just need to have the second wire running to ground (soliniod mounting bolt).

I have mine run through a toggle switch to leave it off, I hardly use lock up unless I'm on the highway.

I'm sure there are other ways but this one works.

I guess if you had a two wire solinoid and single prong pressure switch you could run 12 volts right to the soliniods positive terminal and then run the soliniods negative terminal to the pressure switch and it would function the same as the above.
These two ways require dropping the pan, I'm not into guess work, trying to guess at what pin goes where, etc.
Anyone should be able to wire their lock up one of these two ways using parts already in the trans.

 

I posted about this before but I'll just suffer with the B&M lockup droping at 85mph because im to lazy to try it but if you want to try this go for it and let us know how it works.

 

Be sure to use a 10 amp fuse in the circuit, just in case!

 

Unfortunately I wasn't thinking right back when I posted that. I was thinking of the wiring in the transmission of my car, which is from a Caprice instead of a Camaro. Thirdgen transmissions use a normally closed 4th gear switch instead of normally open like I said. It's still possible to do it without dropping the pan, but you'll need to use a relay.

 

Ok, if i'm reading this properly it seems that if wired this way the torque convertor should lock up in any gear. (provided the switch is on and the brake isnt depressed)

What i'm thinking i'll do is wire the circuit as pictured above, then use the ground wire from the 4th gear pressure switch to activate the TCC. I only really want lockup in OD anyways. Thanks Guys, i'll keep you posted.

 

What I found was that ECM setups use a NC 4.gear switch, but you need a NO switch to control lockup without a computer.
I made a signal inverter to be able to use the NC switch in my 1980 Vette. This car originally has a TH350C so I already had the brake and vacuum switches.
I have some info on the 700r4 conversion and lockup hookup at www.iotech.no/corvette, it's in the tech section.