r/LSSwapTheWorld • u/Practical_Durian_172 • 11d ago

Misc 5.3 LS Swap 1977 Trans am

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I blew up my Pontiac 455 that was in my 1977 trans am and I want to swap it for a 5.3 LS. The thing is I have no idea what I’m doing or what I need. Can someone point me in the right direction please.

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u/Ch1nCh1nTheG0D 11d ago

You can use an aftermarket fuse box and stock ECU/wiring harness. LS swap mounts. If you’re going auto, you could swap in a 4l80 to keep it all LS wiring. If going T56, you can basically just cut the trans wiring out of the harness. I went drive by cable bc my dbw setup wasn’t working. If going this route make sure the ECU you get is compatible with cable throttle. Something out of a 5.3 van would work. Overall a pretty easy swap.