I have recently had some transmission issues when in cruise control. The cruise will suddenly kick out and the transmission starts slipping. I'll pull over shut the truck off restart and it's fine. The only time it does this is when I'm using the cruise control and it kicks out. Anyone have any ideas what is going on here?

 

I'm assuming this is on your 2001. Is the O/D light on your shifter blinking? I've heard of the shifter wiring harness shorting out and causing issues.

 

try to find somebody local who can pull your codes for you, that's a good place to start.

 

I don't mean to hijack the thread

But if this truck is the 2001, would the mechanical diode cause issues with the cruise control?

 

I think ur right here Lisa. Pretty sure the diode causes this and a flashing OD light.

 

Here is some info from the TSB & build dates for the diode: 01-13-5***TRANSMISSION - 4R100 - DELAYED OR NO 2ND GEAR - DIAGNOSTIC TROUBLE CODES P0781, P0755 AND/OR P0756 - VEHICLES EQUIPPED WITH 4R100 TRANSMISSION WITH TRANSMISSION BUILD DATES BETWEEN 7/27/2000 AND 3/23/2001 ONLY

*FYI above info thanks to Mark (farmdad)