4.3L to 5.3L silverado engine swap help

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11-24-2014, 09:07 AM

#11

TECH Junkie

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Quote:

Originally Posted by Erik Obi-wan

Okay I have have a 99 Bravada. Not a sport truck by any means. It does have the 4L80E in it as well. I blew my stock 4.3 vortec seeing as it hit 313k. I want to drop something else in there. Would it be easier going with the LB4-Z or going with a 5.3?

4l80 factory in a bravada?

12-25-2019, 11:14 AM

#12

Kevinj562

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How to get A/C to work

Quote:

Originally Posted by Justchevytrucks

The tach will work fine. They don't differentiate between V6 and V8 gauge clusters. When you go to buy one for this vehicle they are all the same. The V8 ECM sends the correct signal to the tach regardless of what it originally was.

I have a 5.3 LS lm7 that I pulled out of a 01 GMC Yukon complete motor and 4l60 drive-by-wire throttle I want to drop it in my 05 Silverado single cab short bed it currently has a 4.3 V6 I have all the necessary stuff to drop in the motor I had the harness rework to standalone and the computer reflash my question is the guy that did the standalone he removed all the AC wiring and abs so once I do the swap how would I get my AC and abs to work

12-25-2019, 10:54 PM

#13

RedXray

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I'd look for a different harness from a salvage yard. Look for a V8 harness from an 03+ Tahoe, Silverado, Sierra, Yukon or Escalade that has the Green/Blue PCM connectors. The PCM must also be from an 03+. The 01 Yukon's computer and harness that came with the donor engine will not work with your 05 Silverado.

04-08-2021, 10:40 PM

#14

Dookiedoolittle

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04 5.3 going in a 06 4.3

I have an 06 4.3 Silverado that’s dbc and I’m swapping it with an 04 5.3. I have the harness, ecu, and tac module etc... the 5.3 I have has fuel and return, but my 06 is return-less. Could I put an 05-06 intake on the 5.3 to convert or would I run in to other issues?

from what I understand, it should be a direct drop in.

Last edited by Dookiedoolittle; 04-08-2021 at 10:54 PM.

08-07-2021, 02:14 PM

#15

Dwmiller716

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Dave

Quote:

Originally Posted by Adrianrrdnd

hey everyone I have a 2000 chevy silverado single cab with a crappy 4.3 engine. I need help on what i need to do to drop a 5.3 in there. Please if anyone can help me on this I would apreciate it. thanks

Do you still have the 4.3L engine? Is so how many miles and would you sell?
Dave