4L60E Replacement

[Jeremiah Cummings]

Need some technical knowledge. I am going to be replacing the transmission in my truck, 96 GMC K1500. The issue that I am running into is that 96-97 were stand alone years for the 4L60E and they are hard to find in my area. However the 98 and up 4L60E are easy to find but they do not interchange with the 96 due to different internal electronic controls. My question is, would it be possible to switch my current ECM with one from a 98 in order to use a 98 and up 4L60E? Any help will be greatly appreciated.

 

[df2x4]

I believe you would have some trouble with that, as the PCMs switched from five to four connectors in '98. The wiring is going to be different between the '98 PCM and your '96.

 

[Jeremiah Cummings]

I was afraid of something like that, thanks for the info.

 

[df2x4]

No problem. Have you checked car-part.com? Sorrels Auto in Columbia has one that's tested good pulled from a '97 K1500 with 204K on the odometer, $650. There's a few more in Kansas City for around the same price.

 

[skylark]

Put the 96 harness in a 97-99 transmission. The only difference is an extra ground wire in the tranny on the 97+.

 

[Steve A]

I don't have my ATSG update manual handy but it seems like they changed the TCC (Torque Converter Clutch) solenoid back to an ON-OFF type after 97. Easiest way to fix is to move all the 96 solenoids along with the harness to the 98 trans. Probably wouldn't hurt to change the filter while the pan is off either.