I just finished installing a 80e, two piece driveshaft, and re piping exhaust for crossmember for carrier baring. My friend retuned it for trans and while we where tuning the motor the abs and brake light came on. Checked the abs sensors and cleaned them but still does it. Does anyone know how to fix the problem

 

Find a scanner that reads out the ABS code and see what that code is telling you.

It could be a wiring issue or even a fault inside the electronic brake control module.