I'm baaaack! Sorry for the long absence, but I've got some good excuses, including but not limited to the thanksgiving holidays and my mother-in-law becoming really ill and dying! Anyway, back to the shifting problem. 2 weeks ago I decided to take my jeep to a very reputable tranny shop to see if they could provide a diagnosis.
The tranny tech hooked up his computer and we went for a ride to see what it would tell us. Everything was fine for about five miles of
driving fanywhere from thirty to fifty mph to get the tranny to shift in and out of O/D. After shifting in and out of O/D several times w/ no problems, you could tell the tranny really didn't want to shift into o/d again. The rpm's had to go about 500 higher than before and the o/d kind of slammed when it did engage. The comp said the fluid temp was 160 something, so that eliminated the thermistor
as the problem. The tech said all the electonics were working ok, so he was guessing it might be a seal problem or something. I went ahead and made an appointment for them to work on it the following week. Over the following weekend (before the app't) the husband of one of my wife's friends who I had never met called and says I hear your having tranny probs w/ your jeep. I explained the issue and said he was quite the mopar freak when he was younger
and that it sounded like a piston was hanging up. Apparently they run hot enough that they sometimes get a build up of varnish that'll
make pistons and such hang up inside the tranny. "Just pull the parts out, clean the varnish off and your good to go". I wasn't going to
I wasn't going to tackle this, but I figured what the heck i already have an app't at the shop, so why not. I drained the pan (very carefully) and took apart the gov.sensor block which includes the gov sensor and the gov solonoid. This was pretty easy but I found no probs with it.(and saw nothing like a piston that might slide back and forth) After another 3hrs on the computer I decided to have a look at the 3-4 accumulator piston.This is located under the flat plate on the drivers side of the valve body. It's a flat plate w/ about 5 screws in it and a hook that helps secure the wiring harness for the gov sensor. Remove the screws and the accumulator piston and spring will just about fall out of the body. There is a spring that holds the piston in place to help cushion the shift into o/d and the one in my tranny was broken right in the middle. Can't buy one of these at a reg parts store, so I just stopped there and decided to tow the jeep to the shop and let them finish the job. They didn't find anything alse wrong and charged me $100 to finish the job. That's about $400 less than I originally thought it would end up costing me, and the jeep shifts fine now! I never new a $5 part could cause so many headaches, but I'm back on the road now! hope this helps others and thanks for all the info from everyone, especially you Craig 70!