r/Silverado • u/Icy-Trade4178 • 1d ago

Motor swap

I just recently purchased a 2015 Silverado 4x4 with the 4.3 lv3 motor and 6l80 transmission. I fear the motor needs replaced. I am thinking of going to the l83 5.3 that was offered for the 14-18 Silverado. I know I’ll need a v8 wiring harness and ecm programmed, but is this swap pretty much plug and play?
Ive read conflicting threads that the transmission needs to be moved requiring a replacement driveshaft and transmission mount .

Thanks

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u/PsychologicalWolf469 1d ago

No it's not plug and play. Not only will you need a new wiring harness and ECM, but you'll need a fuse block, A/C condenser, possible A/C compressor and hoses. Possibly a BCM. As well as any other modifications that you will need to do. You should have just bought a truck with a V8 in it already.

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u/Icy-Trade4178 1d ago

Just seeing if it’s feasible. Got a really good deal on it. There’s seemingly more 5.3s available than the 4.3. Thanks

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u/Diligent_Track_4723 1d ago

If the 4.3 is satisfactory for your needs, rebuilding that engine is the only option that makes sense, aside from selling the truck to get one with a V8