2001 Tacoma Prerunner ABS noise

I’ll start from the beginning. 2001 2WD Prerunner differential bad.Absolutely no brake issues.Changed out complete rear end which required unhooking brake lines. Used my original rear harness and both ABS sensors. Bled brakes numerous times and many different ways.Can’t get rid of ABS controller noise during last few mph of stopping. ABS light does not come on.I can unhook the power to ABS module and noise goes away and of course I get an ABS light on. Took to a mechanic shop and they couldn’t get their system to recognize the ABS controller to cycle it.He assured me that system did not have air in it. What I’m looking for guidance is on how did I develop an issue with ABS when before I didn’t have any. Not interested in all the opinions on rather I should or shouldn’t have ABS. Thanks