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First of all, the 700r4 trans. will not even bolt up to the 5.3L

You will also have to put an electric fuel pump inside the fuel tank so the engine will run. You will need a complete wiring harness that goes to the transmission and engine plus a PCM / Power Train Control Module / computer for the 5.3L

You will have to modify the engine frame mounts and add speed sensors. It will cost alot of MONEY. I could go on but I think you get the message.

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Q: What modification are need to place a 2004 5.3 liter engine into a 1985 GMC 4X4 truck with a 700R4 transmission?
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