4L65E slipping

[khenry]

Hi I have a 96 Tahoe 4x4 with a new 4L65E trans and MSD TCM controller and B&m pro shifter. In auto mode trans slips in drive and OD. If I drop it into 1st it will shift hard into 2nd but will slip when I go into drive. In manual mode it shifts hard into 2nd then slips when I put into drive and OD. Reverse is ok. I put in new trans lines cooler and external filter. I dont know if its the MSD controller or what?

 

[Rocket Man]

Why would you install an MSD tcm instead of having a tune done on the stock ecm?

 

[khenry]

I got the truck with no motor trans and most wiring, ECU and ABS removed.
I put a 383 motor with MSD EFI.

 

[Rocket Man]

That makes sense then. Sorry I'm no help but I wish you good luck.

 

[khenry]

Thanks, I think I will try changing the VSS and see what that does. MSD tech was no help.

 

[RED TAHOE LS]

Hate to hear about bad news, sometimes it pays to call back for ANOTHER person for help, just a suggestion, good luck and keep us updated. Possible valve body issue since you have different problems from manual shifting.
David g...........

 

[khenry]

I finally got a hold of a Tech at MSD that was able to help me. He figured it was a bad controller and replaced it. I all so put a line pressure gauge on and have the following pressure readings at idle: Park 80psi, Rev. 200psi, N. 80, 4th 75, 3rd 75, 2nd 215, 1st 220-240psi.
Can you tell me why I am getting such high readings in Rev; 1st. and 2nd ?
Thank you.