If the 700R4 came from a 85-90 firebird or 90-92 f-body all you’d need is a buffer box like displayed above. Tbi cars have them. Should be able to get one from a local junkyard. 90-92 would be the one you need. However if the transmission is from a s10 or newer F-body you would likely need a SGI-100BT from Dakota Digital. I’m doing a LT-1 93-97 T56 swap I’ll have to use one. As my Speedo now reads 67mph going 5mph. I know you post is from last year just wondering if you ever got it figured out?
