Drewmcg
Elite Explorer
- Joined
- August 27, 2015
- Messages
- 735
- Reaction score
- 99
- Location
- Michigan
- City, State
- Ann Arbor, MI
- Year, Model & Trim Level
- 2010 XLT 4WD
2002 XLS 2WD
Had the O/D light flash on my '02 XLS 4.0 for the first time on a 150 mile trip this weekend. Higher highway rpms confirm that the overdrive is not engaging at highway speeds (e.g., 3000 rpm @ 73 mph instead of 2200 rpms). Here's the background:
I have not yet pulled the codes, if any, but will do that today ortomorrow. Again, the car runs and shifts great, but no overdrive/lockup after 45 minutes or so of driving. My questions:
- 185k miles on the transmission (but see below). New fluid and filter 6k miles ago, with no metal found in pan (just fine grey dust on magnet). The transmission has been shifting flawlessly, with overdrive, forthose miles;
- @179k miles I swapped engine(and re-did all timing chains). While I had the engine out, I upgraded the transmission pump with a valve upgrade;swapped in a torque converter from a 116k miles XLT that was built the same month as the XLS, and swapped in the XLT's solenoid pack as well. All ran great;
- This weekend, no problem for the first 100 highway miles.Weather in Michigan relatively cool (65-70 degrees). Then O/D light started flashing, and rpms went up. Never did this before;
- On way back from family visit, the transmission operated fine (again) for first 80 miles or so, then again with the O/D light flashing and loss of overdrive; and
- No symptoms or "flaring" with other shifts.
- Bad solenoid pack;
- Bad torque converter;
- Overdrive servo boreissue/repair;
- metal clogging up a valve in the valve body.
I have not yet pulled the codes, if any, but will do that today ortomorrow. Again, the car runs and shifts great, but no overdrive/lockup after 45 minutes or so of driving. My questions:
- what is best diagnostic order of attack (to avoid "throwing parts" at this w/o actually fixing the problem)? and
- How important is it to stop driving the truck while I figure this out? (I have anothervehicle.)