Sequence of events on my "90 3.0, B/G, 100k: Speedo/Odo quit years ago. Car's been sitting, just driven in neighborhood, for 4 years. Started reviving the beauties lights,brakes,etc. and trani would go into limp mode (2nd gear) until turned off/on. I read all the wonderful posts and ultimately changed fluid/filter. Noticed loose wire on top of trani, (toward back of car) while replacing inner tie rod. It had been ripped from connector. Soldered on, now speedo/odo works. Trani is better, no longer locks in limp mode, but still bangs/slams into lower gears at times. Does much better in "D" (98% trouble free), but of course gas mileage suffers. But it does not lock in second gear, maybe that function is broken (or fixed?) now. P.S.: Occasionally the speedo has fits and jumps around, but tires and settles down. I've read about the speed sensor(input or output?) on the front driver's corner 6" up from pan and will check connection to it now. I do not know what this unit does. Hope it's something I can fix without the trani dudes "having to go thru it". I would appreciate any enlightenment.