2004 GMC sierra
Have a 2004 gmc sierra that drives forward but rpms go up
and dont move until the torque converter gets full lock up
at around 4000-5000 rpm
Fluid is being burn and has a blackish color when drained
out. Tested all solenoids except the tcc solenoid for the
fact that i dont know how to test it beyond a continuity test
Hoping someone can point me in the right direction