Sluggish 1st-2nd Shift
Needing some help with my transmission as the title reads. First off I have a 5R55E transmission and it is the original that came with the truck. I currently have 115K on the engine and the tranny. I have an X3 and I have used the settings on it to change the shift firmness through all the gears. I changed the shift firmness to 25% or the max setting for gear change 1-2. This still didn't help.
Under normal driving conditions the transmission doesn't slip from 1st-2nd, but it does take like a second for it to change gears, unlike all the gears that shift solid and firm. Of course I have changed the shift firmness on those gears too, but they all shift great whether it is normal driving or under hard acceleration. The only time my tranny changes good is from 1st to 2nd is under hard acceleration.
My question is, have I set the firmness to high on my X3 or is this just due to old age and my transmission may need some work on the internals of it? I tow with my Ranger nearly everyday, but I never even come close to the max towing capacity. Most of the time I tow about 1800-2000lbs. 2500lbs max.
Any ideas where I can start my search for troubleshooting?
-2011 F-150 Lariat: 5.0 "Coyote" V8, 6-spd Auto (6R80E), 3.73 ELocker. White Platinum Metallic Tri-coat.
-1992 Ford Ranger: 4.0L OHV, 5spd (M5OD-R1), 3.27 Open.