At speed higher that 45 seem like it is upshifting and down shifting
Apr 2, 2010 at 4:28 PM
CH112063
✓Experienced Mechanic
1,320 POSTS
This may be from a problem with either a sensor or an internal problem. Check the fluid. The overdrive is electro-hydraulically controlled and has self diagnostic codes. You'll need to scan the TCM to be sure. ok Congratulations on the high mileage.