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4l60e no 3-4 Bill 6-19-09  
I see many other have had the same problem that I'm having, but don't see many answers.
I have a 1994 SLP Firehawk LT1 that's highly modified and supercharged. I built the trans to handle the load and installed it a couple of weeks ago. I put about a houndred miles on it before heading to the track to dial it in. On the third pass it launched hard, shifted to 2nd and the trans made a violent bang and quit. I found I could manually shift and start out in 1st and 2nd O/K unless I hit the loud peddle hard. Once going though I can shift it into 3rd and OD and it would go normally with very light throttle input. Too much causes it to quit driving.
I again disassembled it thinking I'd find a hard part failure. The convertor is OK. The speedo works, line pressure is about 80psi in all positions except reverse which is higher. I unplugged the VSS while in 2nd which caused the motor to stumble, increase RPMs then returned to normal when replugged. There's 4.25 volts to the VSS KOEO. The ground wire is good. The shift solinoids are new. I installed a new valve body and a Transgo reprogramming kit, 2500 stall TCI convertor and returned to a 10 vane pump. No problems could be found. The convertor was cut open and it checked out.
I just reinstalled it and you guessed it, it still not working! Should the VSS be open when ohmed? Could it still be a speedo even though it works? Should I increase the line pressure? To what? Any ideas? I need to be at the track in two days. Help!
Re: 4l60e no 3-4 BUBBA THE BUS TECH 6-19-09  
Sounds like you flipped a one way.
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