[Michael cuevas]

Hey guys I’m doing a V-8 swap on a 2002 Chevy Astro. it already has the 4L60E transmission in the van and I want to put a 5.7 Vortec in it from a 1996 Silverado I have found a wiring harness by Howell wiring it is #HV57T can I use the PCM off of the 5.7 and wire my engine with this ?

 

[Bikley]

The issue I see is your '96 PCM isn't going to play nice with your '02 transmission. The 4L60e evolved over time and the controls may be different. If you find that they are compatible, by all means use the '96 PCM. I would take the Silverado harness too.

 

[markmitch]

You will need the harness from the vehicle you took the vortec from first. Then wiring schematics from both vehicles to make one harness from the two. Wiring can be quite scary to some people but study the schematics and lay out the two harnesses to see the differences then make one out of the two. It has been done and hopefully someone will chime in on how they did it. This may be of help: 2002 chevy express 5.7L vortec, L31 swap help Mark

 

[Michael cuevas]

The issue I see is your '96 PCM isn't going to play nice with your '02 transmission. The 4L60e evolved over time and the controls may be different. If you find that they are compatible, by all means use the '96 PCM. I would take the Silverado harness too.

I do have the harness from the truck also. I guess I can use it and I do know a good mechanic that says he can make it work.

 

[stent]

the 1996 "black box" PCM is inferior to the 2002 "0411" PCM that should be factory installed in your van. keep the PCM you have and wire & program your conversion as if it were a 2002 Express/Savana van - the Vortec 5.7 V8 was an option in these vans and uses the same PCM as yours. if your silverado upper intake plenum looks like this :

then i believe the stars have aligned for you!