91 4L80 trans with a 5.3L What ecm will support this tranny?

I have a 91 3/4 ton truck that I'm going to put a 5.3L from a 2000 chevy truck in. I was going to use a harness and ecm from a 98 LS1 to control the motor with a LS1 intake. But while pulling the 5.7 TBI motor out I realized I didn't have a 700R4. This is a four wheel drive and I'm not looking to change out the tranny or transfer case. So can I get a newer ecm to control this tranny? Is it possible to leave the old ecm in to control the tranny? I would rather remove the factory ecm and run one for the motor and tranny.


Any help or thought are appreicated.

Thanks

Personally I use prefer a PCS transmission controller.

Well I talked to a tranny shop and ordered a internal and external wiring harness. This way it will have the same wiring as the 93 and newer 4L80E's. I have an ecm from a 2000 silverado 1500 pickup. Will this support the 4L80E.

Yes.