Look at post # 12 check that site out.

 

Good stuff

 

Im also looking into doing a swap on my 94 gmc 1500 I have been debating on upgrading to a 4l80e was there much modification needed to the trans tunnel and drive shafts as well as the shift linkage if and when I do the swap I plan to get the trans and engine as one unit

 

Never thought GMT 400 trucks would get all the rage they are getting.... proud owner of my 97 3/4 ton.

 

what fuel pump did u get

 

I seen someone say they used 2001 chevy Silverado headers on there swap will they for sure work. Does anyone know for sure

 

hi! I’m trying to do the same thing with my 1990 Chevy 1500, I bought a parts truck with motor and trans but thought I needed a new wiring harness. You used the original?

 

You can use the 5.3 harness but you need to modify it. I went with a pre made harness from BP-Automotive and you only need to connect 4 wires. I did my swap back in 2011. If i was going to do it today i would use the holley terminator X setup. Way easier to setup and if you want to upgrade cam or heads much easier to program then buying Hptuners and learning or spending money to have someone tune it everytime you make a change.

 

I'm doing the same oname a 88 firebird it was a 305 tbi I'm putting a 200 5.3 truck engine in with the Trany from the truck as well I got the engine in I'm having trouble with the wiring do you have digram for what you did with the factory harness wiring in the factory badges I'm no expert I'm just getting started

 

What about the throttle body I have have a wired one

 

You really need to check the post date when you reply to a two year old thread. bustac hasn't been here for over 2 years