Picked up a new to me 2017 platinum which looks to have been well taken care of over it's 102000 mile life. However after a couple of days, coming home on a 100 mile round trip on the interstate (it was probably in the 30s when I left but in the 50s or 60s when I return home) at around 80mph, when the transmission went to downshift to 9th and then back up to 10th the engine speed would increase like it was slipping and then it would quickly show it shifting into first gear and then back to a higher gear like 7th 8th or 9th and then when it would shift into 10th it would repeat the process over again. I slowed down and it seemed to resolve itself. Fast forward a couple of days later and I was making the same trip and about the same conditions (much warmer in the afternoon than in the morning) and this time in addition to its weird behavior I got got the dreaded wrench light. I again slow down and switched to manual mode but it was obviously locked out of 10th gear. For a few more miles after I got off the interstate and when I made a turn onto a small two-lane blacktop road in auto mode, the truck just would not accelerate for a moment but finally engaged the gears. However just a very short distance from my home it started rapidly cycling through multiple gears. Had to again put it in manual to drive the last quarter mile home. Check for codes and got a 10th gear incorrect ratio. Turn the truck off and back on and the wrench symbol went away. Had my son crawl under and check the transmission fluid when he got home and it was filled above the top of the stick. And that was with the transmission still a few degrees below minimum operating (using forscan to monitor temps). There weren't any leaks or anything blowing out the vent. My son who is an ASE certified technician suggested that the problem might have been foaming because of it being so overfilled.
Anyone ever experienced a overfilled transmission? It looks like there were wrench marks on the dipstick cover so someone has been into it before to at least add fluid. The fluid looked really clean but I think we are going to change the filter and fluid as a minimum. Why would it be so full? Think I've damaged things? I'm guessing 10th clutches are smaller diameter and therefore more prone to slip if there isn't enough pressure from foaming fluid. Thoughts and suggestions from the group will be appreciated!
Anyone ever experienced a overfilled transmission? It looks like there were wrench marks on the dipstick cover so someone has been into it before to at least add fluid. The fluid looked really clean but I think we are going to change the filter and fluid as a minimum. Why would it be so full? Think I've damaged things? I'm guessing 10th clutches are smaller diameter and therefore more prone to slip if there isn't enough pressure from foaming fluid. Thoughts and suggestions from the group will be appreciated!
