Official NBS 4.3v6 to GEN 3 V8 swap Guide

[ducky]

Ya I'm not so sure whats so hard when I ask and pay for the whole engine wiring harness. To their credit, they felt bad and got me other cut half the next day along with 2 coils. The big question is if I'm going to be able splice and fix it.

That sounds like a huge pain in the ass. I went to a junkyard and picked up a harness for a little under 200. I also got my motor not really all complete for 700 without harness

[carnell]

New drama....

The machine shop called and said that I have a 4.8 and not a 5.3. I guess the crank size is different. My receipt said I bought a 5.3. Sooo the big question, do I take the engine back (in pieces) and demand a refund along with the machine work??? Or will a new crank bring the engine to a 5.3????

Thoughts.......

[zebra]

a 5.3 crank will get you a high compression 5.3 with those flat-top 4.8 pistons. as for any other differences - someone else can chime in on that

[carnell]

After a little research, I was bale to find casting info for the crank and pistons for a 5.3L engine and confirm that's what I have. No harm or foul for the machine shop. Looking at it now, easy mistake.

[b18c1turboedek]

When i bought the V8 swap it came with the ecu and all connected. I tried too start the truck today and nothing. Starter dont turn over or anything.Theirs a key lock and car light on the guage cluster, that turns on when trying too start the truck. Do i need to get the key programmed or anything for the new ecu?
I installed my v6 ecu back into the truck, it does the same thing.
As far as i can tell everything is connected and installed correctly am i missing something?

Thanks

[zebra]

sounds like VATS needs to be disabled. who did your tune?

[PitchBlackC3]

Do the VATS relearn. You have all the VATS equipment, you don't need it disabled, just the relearn.

[RedHeartbeat]

You do not need the TCI controller for the 80e to work on a Gen3/4 engine, the PCM can be tuned to control 100% of the shift functionality. You don't need to change gears to get the 80e to accelerate quickly either, the 80e converter is a lot looser than a 60e converter is. It's your money, spend it how you like but do it wisely and well informed.

[gottaswapup]

a 5.3 crank will get you a high compression 5.3 with those flat-top 4.8 pistons. as for any other differences - someone else can chime in on that

If you use any crank other than 4.8, you also need any rods other than 4.8. The 4.8 got longer rods to make up for the shorter stroke.

[carnell]

Well I'm good. Looking at the casting numbers, I do have a 5.3. Simple mistake by the shop I should be getting the block back tomorrow from the machine shop. I'll start putting the engine together this week and have a planed install date of Nov 12th and 13th. It would be sooner but I have to play Navy the next few weekends.