Torque Converter Question
My truck has an automatic transmission (5R55E), that has given me some trouble. The truck has 88,xxx miles on it, an the fluid has been flushed (by Ford dealer) every 30,000 miles using Motorcraft Mercon V.
Some time ago, I started noticing poor shifting (sometimes no O/D downshift), a vibration/shudder under my feet (my assumption is the torque converter) and an occasional failure to shift into neutral when braking.
After describing the symptoms to my mechanic, he called his transmission specialist and we went to work. We flushed/replace the fluid with Mobil 1 ATF, cleaned the pan/magnet (both were very clean), replaced the filter (again very clean), added 2 ounces of Lube Guard shudder guard, and replaced solenoid #1 (shift) and solenoid #3 (can't remember the name).
The transmission shifts very smoothly now, and feels as good or better than it ever has. All symptoms have disappeared, except the shudder. The shudder is greatly reduced (from a "10" to a "3-4"), and really seems to mostly occur when it is cold and right before a shift. I was told that the torque converter may just be beginning to fail. Since the Lube Guard had a noticeable affect, I was wondering if I should add another tube.
If the torque converter is failing, it will need to be replaced. I suppose that that would be "major surgery", and wonder what it would cost. My knowledge of transmissions is obviously limited, so any knowledge/information/insight would be greatly appreciated. Oh, and Merry Christmas!
Harvest Gold 2001 Ford Ranger XLT 4x4, Off Road package, SOHC 4.0 automatic, Line-X bed liner and step rails, Silverstar bulbs, Alpine CDA-7894, Alpine R series 6.5 components [front], Alpine R series 5x7's [rear], "hard wired" Passport 7500s radar detector, 35% tint on sides and top of windshield, Undercover tonneau, Rancho RSX shocks, Clifford Matrix RS2 remote remote start/alarm, BF Goodrich All Terrain T/A ko tires, blinker mod, Fusion'd grille, 06 emblems, clear corners, Wet Okole seat covers