when you start from a dead stop the trans slips for a split second.
Feels like it could be a bad u joint but was told by the dealer they were ok.
If you have some wgt in the bed it does not seem to happen. That's why I thought it could be a u joint. Can anyone help me
Thanks.

 

When was the last time the fluid was changed?

 

My 150 just turned 60,000 and have not had the trans oil changed yet. The dealer said something about a pressure ball had a flat spot on it.

 

this problem has been going on almost a year and has not gotten any worse

 

Change the fluid. 60K is about time. Just don't do like I did and wait till it fails lol. Mine did make it all the way to 130K, but that's besides the point. It might have lasted longer had I changed the fluid. If you change it, it might just stop slipping.

- Erik