The ecm only controls ground signal to the trans for converter lock-up function. If your tv cable will not hold adjustment, then replace it with one that will. Set it to be as tight as possible at wide open throttle and you are done.
I'm waiting on a new cable the universal one that I just had kept poping off the the TV link. So I put the original back in.
This is how mine is operating.
While the original motor (350K TBI) was still in the Trans shifted fine.
I replaced the motor with the 96 vortec with TBI intake.
None of the cables were touched just moved with bracket out of the way.
Test runs normal driving the truck would surge. Like it's trying to shift up then down in overdrive.
I made adjustments to the TV Cable followed instruction and as you mentioned.
Start drive with a feather foot it shift's without a problem all gear's then if I give it more pedal (Not to downshift just before) it runs good, come to a stop it's totally screwed, from the stop engine rev's high it shift's from first to 3rd (I think or it goes from 2nd to 3rd quick) at 25mph. 25 to 65 no over drive. Come to next stop it never downshifted to 1st I have to manually downshift before taking off.
So I thought maybe the TPS ECU is/could be causing this since the new/different motor. Different speed/RPM ? idk
