Drivetrain issues
-Pulsating vibration at ~4000 rpm. Seems to happen in 3rd & 4th gears only.
-Converter does not unlock when I give it slight gas, instead it surges & kinda goes unlocked-locked-unlocked-locked...& so on. It unlocks successfully only when it down shifts 4-3 or 3-2, or when I hit the brakes.
I know the second problem could be tuning related, however I changed lots of parameters & triple checked everything via LS1-Edit, and was not able to solve the problem.
Does this sound like a tranny issue or a converter issue? Could I have a bad lock-up clutch?


