Agree. Possible TC or signal problem. This is if its in OD.
If this is the case you will have code. A jump of 500rpm would show TC as good. You might not see the 500 due to its slowly slipping.
If happens only during the actual OD shift. Its another issue.

Bill

 

Typical? Would agree that they will do this. But its not good on the trans.
Many ways to remedy? How many and what? Interesting can you explain?
Still waiting on the c00n cure. "comming soon"

Bill

 

I am a new member and just posted this in the pre-powerstroke forum.
Sounds like you have a similar prob to me. Any help would be greatfull.

94 7.3 turbo auto probs??
Yeasterday an I was driving to work and my trany started to make a wining sound and was slipping in drive. My OD light started to blink. I pulled over and everthing seemed fine untill I started to drive. It seemed to be fine in 1st and 2nd, but when it shifted into drive the wining and slipping started again.
I was about 100 miles into my commute with about 30 more to go, no cell service, so I limped into the work site in second gear.
To make it short I limped home in second gear and was able to drive in drive if I was going down hill. It was a long day!!
I have had a speed sensor failure in my other truck before which caused the trany to go into limp mode, but I think this problem is a little more than a speed sensor. The wining( which sounds like a cavitating hydraulic pump) and the slipping makes me think the trany is shot.
Does anyone have any ideas???
Thanks

 

Whining can have a thousand issues. Cant diagnose that. Could be worn or broken band, plate clutch pack, a trillion things. Sorry.

 

fluidp

I would agree. Its time for a teardown to investigate.

Bill