Im about to lay hands on a complete '98 5.7 Vortec changeover from a 2 door Tahoe for my '84 K5. Im trying to keep everything up to snuff on the emissions just incase the smog nazis decide to come to my city to try and take my blazer away from me. I was wondering if a hall effect sender on my 700R4 would be an exact match to the factory VSS signal so it wont trip the ECU into limp home mode. I could be just way over analyzing the situation, im mostly use to dealing with Gen III engine systems that take the VSS signal in conjunction to determine engine load. Im just trying to figure out what kinda can of worms i'll be opening up by not having the 4L60E hooked up. I like my 700R4, plus i just got through rebuilding it 2 months ago so just tossing it in favor of a 4L60E is a no go. Anybody that's done the swap and can lend a hand on the ECU information, i'll appreciate it. Everything besides that im straight forward on, i even get to use the fuel pump off the Tahoe with a factory blazer FI sending unit.