Official NBS 4.3v6 to GEN 3 V8 swap Guide

[dlh2006]

The 4.8/5.3 mounts bolt right in, no need to cut/weld etc.

they lines may be too long, but im sure you can make them work.

[007 RACER]

Nice Write Up Does Anyone Know If The 6.0 Is Pretty Much The Same As The 5.3 When It Comes To Swaping Out The Old 4.3?

[1BAD6660]

i have a 2003 4.3 its dbc, do i need to get a dbc harness or a dbw??? id like to keep the cable and not have to mess with the dbw, dont u have to have the gas pedal and mount and all to make it dbw??? THANKS!

[zebra]

Are the comp 121/218 camshafts?

Also, if the 5.3l is the same year as my truck, will there need to be changes on the 5.3 wiring harness prior to the install?

Thanks

Carnell

p.s. What do you do at NAS Pensacola?

it's a camshaft - 212/218 are the intake/exhaust valve lift specs, which are what cams are generally referred to by
for the harness, so long as both you & the donor use the same transmission, you shouldn't have to change anything that i know of

i have a 2003 4.3 its dbc, do i need to get a dbc harness or a dbw??? id like to keep the cable and not have to mess with the dbw, dont u have to have the gas pedal and mount and all to make it dbw??? THANKS!

you can do the DBC swap on a newer motor, but i don't remember what all's involved. search around & you'll come across where people've done it before

[carnell]

Thanks for the info. I'm still shopping for a engine. A local guy has a 02 Tahoe with 87k and he wants 800 for the engine including wiring harness and comp. I'm not sure if I want to pull the trigger.

If the Tahoe has a different transmission? Can I send the harness off the new engine to nelson tune for them to make the mods?

Carnell

[zebra]

same 4L60 in the tahoe - you're good to go. just check to see if the hoe has traction control or not - yes=DBW, no=DBC
and Nelson can do harness work (not that you'd need any - assuming the one they send is good). Current Performance Wiring did mine & i'm happy with it

[1BAD6660]

Zebra i have ALOT!!! i called Nelson perf. today and they they would make a completely new custom harness for $650!!! OR i could send them a cable harness and make it work with my 03 for $450!!! im on a tight budget!! i can do either but i would rather save that $$$ for some LT's and a cam, ive read that if u have a 03+ truck u need to make it dbw cuz thats what all the 03+ v8 trucks are.. someone tell me what i need to do!!! LOL... cuz im LOST!!

[Frenchy]

OMFG this has been covered in a few threads. Make it DBW it's so much easier to just replace the gas pedal.

[b18c1turboedek]

I have a few questions. Im in the middle of the swap right now, after putting everything toghter we went too install the torque converter bolts, the motor was locked. We figured out the torque converter was hitting the flywheel. We removed the tranny and motor spins fine.

I used the 4l60E that was bolted too my 4.3 motor, i also used that converter. What flywheel am i suppouse too use? The 4.3 flywheel bolts are off center on the 5.3 motor. Any help would be apprciated.


Also the DBW is their a write up on that anywhere, i searched. Problem there is the truck was cable before, but the swap i bought is DBW, i looked under the dash how doo you remove the old pedal? can i just cut it out and bolt the DBW one up?

[zebra]

use the 5.3 flexplate & make sure it's on the right way. i don't think they'll go on backwards, but there's no harm in checking