My 1995 dodge 3500 wont stay in lockup

SOURCE: 2002 Dodge 2500 diesel auto

could be a bad lockup solenoid or a bad torque converter

SOURCE: Transmission problems

If you have not had your transmission serviced in the last 30K I would start with that. when the filters start to get restricted it can cause this problem. Be certain who ever does the job is familiar with chrysler transmission as they require atf+ 4 fluid and the clutch bands need to be adjusted to the right spec. It is also possible that the vehicle speed senser is bad this would most likely affect your speedometer as well. there is also the chance that there is an electrical problem bad switch or short in the wiring this is unlikely

SOURCE: 1995 dodge ram 3500 turbo diesel and it wont get

tsp cable out of adjustment

SOURCE: 1992 dodge dakota 5.2L wont shift into overdrive

I have the same problem and i cant figure out the solution either one day it worked next day it didnt

SOURCE: 1995 dodge 3500 4wd wont engage have shifter on

Any time your dealing with a 4x4 system the best start is at you front axle. Its primarily a vacuum leak so check to see if the 2 vac lines are hooked up (its good to check the electric connections.). When your 4 wheel drive is engaged and the motors running you should have vacuum at one or both of thee lines depending on if your in 4 hi or low .
If no vacuum at axle check the Vacum switchs(the plug with 4 vac lines) on top of the transfer case it will have 2 feed lines(grey & green) they conect in to the into the vacum harness on back of motor (passanger side). A vacum schematic is normally located on the raditor core support (right under the hood next to hood release)
Hope this helps