Does anyone know who may make a Torque Coverter Lockup Delay unit for the 4L60E?
I have one installed on my 87 Blazer K5 with the 700R4, and it simply plugs inline to the lockup harness on the side of the tranny. The unit keeps the T. C. from locking up until 55 MPH and in Overdrive. Gets rid of all the "hunting" that goes on at part throttle. Any info would be appreciated.

Chris

I don't know about a stand alone unit, but considering it'* electronicly controlled, you could have the vehicle tuned not to lock the TCC until 55 mph. I'm not sure who could perform that for you as the application is currently unknown.

Ok, good idea. But I am lookin for a plug-and-play type unit. There must be some kind of resistor built into the plug-in unit on my Blazer that keeps the lockup from happening. I know, the Blazer is GM-2 and the Bonne is OBD1.5 or whatever, but it is not OBD2. Is my tranny TOTALLY controlled by my PCM, or what? Or is there a seperate box for the tranny? Or is it electronically independent of the PCM, like I would think it shoud be in my year(94)?

Thanks again--Chris

So you have a 94 BONNEVILLE? Then you don't have a 4L60. You have a 4T60. We need to clear this up.

It won't be just a resistor. It'll be a bit more complicated than that.

Oh, that was stupid.javascript:emoticon('')
Embarassed Sorry. "T" for transverse mounted. You'd think I would know that by now. The one on the Blazer must just be a resistor, because it is just like a harness extension, no box or anything. Is the 4T60E similar,in that it is not truly computer controlled?

Chris

TCC lockup in the 4T60E is entirely computer controlled.

Please put your year and trim level in your signature. It'll help a ton.

If you think it'* 100% computer controlled...unhook your vacuum modulator and see what happens.

To my knowledge the first 100% computer controlled tranmission is the 4T65.

Lockup is computer controlled, as are shift commands. Line pressure is not. (Note the TCC Lockup part ) To my knowlege, the lockup is not simply off/on, but activated with pulse width modulation. It doesn't fully lock(50 to 60 rpm slip on lockup). Correct me if I'm wrong on that.

The 60E is not PWM. And it is entirely PCM controlled. The Vacuum modulator has nothing to do with when it locks up.

Disconnecting the VM will only make it lock up with a different pressure.

The 65E uses PWM rather than simply full on or full off like the 60E.

The Predecessor (4T60 NON-E or 440T4 from 86-91) did not use electronic (PCM) TCC lockup control.

Thank you for clarifying on the PWM, Bill W. I wasn't entirely sure, hence the "correct me if I'm wrong" bit.