1989 Chevy speedo

[JurgenS]

I replaced the TH700R4 in my 89 C1500 with a 4L60E and a Painless Torc transmission controller. Everything is working except, I have no idea how to hook up the speedo. The controller has an output signal (1 wire) but how do I connect it to the speedo?

Anyone got an idea how I can have the original speedo working?

thank you

 

[someotherguy]

You should be able to get the speed signal from the same place it was on your 700R4; the sensor in the tailshaft housing. Or do you have that hooked into the controller?

Richard

 

[JurgenS]

The 4L60E has a standalone controller that provides an output signal which can be used but how should I connect it to the original wiring?

Not sure about the color codes of the original wiring and they also were cut. It is also a 2-wire sensor on the TH700. Don't want to experiment to much as I do not want to damage the 4l60E controller.

 

[GMCTRUCKS]

When I disconnected my speedo on my 1990 GMC I installed a rpm gauge to see how fast I was going well I hope you get it figured out good luck.

 

[someotherguy]

OK I'm gonna try again. Your 700R4 had an electronic speed sensor in the tailshaft. Your 4L60E does, too. Hook it up just like your 700R4 was.

Unless you're a 4x4, which in that case the speed sensor is in the transfer case and wouldn't have been disturbed in the swap..

Richard

 

[JurgenS]

It's a 2wd and I got it working, I connected the controllers output signal to the wire from the speed sensor that goes to the bulkhead and the other one, I used as a ground.

Works perfect!