Trans help

[robh77L48]

First of all, this is my first thread (newb-ness!!!)

Recently, I blew out second gear in the stock TH350 trans in my '77. I found a local guy with a used motor and trans out of an '81. I did the trans swap at work, and I noticed one major difference: a squarish electrical connector on the top of driver's side of the case. My questions are these:

Firstly, what kind of transmission did I put in the car?
Secondly, what does that connector do? (Overdrive?)
Next, if it is for OD, how do I hook it up (I've been told it's possible by converting voltage to 5v and hooking to the trans somewhere)?
And lastly, what other differences in the tranny should I know about?

Thanks, in advance, for the help.
Rob

 

[Hib Halverson]

The connector is probably for the torque converter clutch (TCC) which the very late model 350s have.

As for hooking it up...you'd first have to get the 81s transmission control electrics in place before you can use the TCC on a 77.

 

[photovette]

The TCC connection locks the torque coverter. It's a simple 12v soleniod--you can make a manual switch to engage it on the highway with ease--you should yield 1-2 mpg improvement.

Also. B&M makes a switch just for that.

And you might also want to check out :

TCI® has developed a universal lock-up system (Part #376600) that allows the TCC to be controlled automatically using a valve body pressure switch and an engine vacuum switch.

 

[Daryllawman]

Just wanted to welcome you to the Corvette Action Center...Good place to be when the Vette is parked....good people in here with some really fine cars.....Enjoy !!!

 

[bill81vette]

welcome to CAC,Rob as you may have already found out there is a wealth of info here among us if you ask!!! enjoy the vette and the forums!!!!

 

[robh77L48]

Thanks a bunch for the info guys. I'm glad to be here. I hope to be of help around here some day and to learn as much as possible from you guys.