Swap help
Thread Starter
Registered User
Joined: Feb 2023
Posts: 3
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Swap help Hello I have been gathering parts for a while and attempting my first swap. I have a 2001 Silverado 1500 4.3. The motor locked up on me. I got a l33 a year or so ago I plan on putting in. I have a wire harness that went to a 2001 6.0. I've seen you can repin the S,T,U pins on 4l60 plug to be a 4l80 and in the end you do don't use two wires. My question is if I wanted to do that in reverse are those 2 extra wires available on a 4l80 plug so I can convert it to plug into my 4l60? I was thinking I may just need to get another harness for a 2001 5.3 4l60.
TECH Apprentice
Joined: Aug 2018
Posts: 383
Likes: 108
On my 99 4.3 to 5.3/4L80e swap, the repining at the case connector removed 2 wires that were then used for the second speed sensor (obviously also required a repining of the ECU connectors.) In other words, the existing wiring can all be used; no additional wires need to be to run back to the ECU.
It's pretty easy. LT1swap.com has the information.
Edit: but your V6 engine harness won't work on the V8 swap. You'll need a harness from a 99-02 V8. If you get a 99-02 2500 LS-based engine, then that's already ready for the 4L80e.
It's pretty easy. LT1swap.com has the information.
Edit: but your V6 engine harness won't work on the V8 swap. You'll need a harness from a 99-02 V8. If you get a 99-02 2500 LS-based engine, then that's already ready for the 4L80e.
