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Transmission not working properly after swapping a 4.3l engine to a 5.3l engine?

Tiny
STEVENHHH
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 195,000 MILES
I swapped engines from the 4.3l v6 to the 5.3l v8 and used the transmission from the v6 and torque converter. I got a new wiring harness, changed steering column, PCM and BCM, it will not go into gear, cranks and runs fine.
Wednesday, July 20th, 2022 AT 2:23 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Nice work, the first thing I would do is check the transmission fluid level, also was the torque converter completely installed (three steps) if not it has ruined the front pump of the transmission. here is a video to show you what I am talking about:

https://youtu.be/ZC7xHVMKLRw

Also, we should run the codes to see what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Let us know what happens and please upload pictures or videos of the problem.
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Thursday, July 21st, 2022 AT 11:46 AM

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