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if this is a manual transmission( details not provided) then check for transmission mounting bolts are tight, extension housing bush is good and not worn, rear engine mounts, worn gear selectors not putting it in gear properly and or if a stick shift, check that the gear lever is not restricted in the selection process.
Make sure that your axles aren't broken. If you have a broken axle the power would transfer to the wheel with the least amount of resistance (to the broken axle) therefore not propelling the vehicle. Also look at your fluid level and condition. It is possible that the transmission is slipping in which case you'd need a transmission/rebuild.
The switches inside need to be replaced they are hanging up do this now before you ruin the clutches it will go back to normal shifting and work fine change all pressure torque lockup and shift switches diy for about 125.00 with fluid filter cost and back to normal shifting and a happy van and crew make sure vans not running hot burning fluid otherwise will happen again high temp burned fluid damages switches ability to work
The shift solenoids are usally located inside the transmission pan and yes this could be the cause of not shifting.I would try one thing first try shifting manually put the gear shifter in the number gear and take off as you begain to pick up speed shift the gears to the number two and so on and see if it shifts this way.Get back to me and let me know
Okay you will need to program the shift points again this is normal when battery voltage is lost, you will need to shift yourself and try to get it to shift when you want it to, what you do is remove the negitive battery terminal for 10 mins, then connect it back, start the van when you take off the shifter must be in low gear try to go slow until you have a straight away then accel and shift gears up until you hit the last drive gear make sure to shift as it use to or as close, dont rev to high before shifting as you shift up the computer stores the info and thats the way it will shift if you make a mistake unhook batttery again and try it again. i cant rememeber the exact shift points but i think you will know as its the van you drive, doesnt have to be perfect, for example start off in low and when you hit 15mph shift up a gear then ithink at 25 shift up and then 35 or 40mph shift and so on, you dont want the engine to rev to high between shifts it should be smooth but you you feel it a bit, hope this is helpful. let me know the out come, i do this all the time, dodge ,chrysler cars and vans. good day.
There are a couple of videos on youtube where people solved the same problem by replacing
the input speed sensor Costs about $30.00 for part.
Maybe this would help?
I am not a mechanic but I have same problem and am trying to get to the bottom of it
May 1996 van has been doing the same thing for a couple years. It will then sometimes
shift into 3rd gear after driving awhile.
Unfortunately my van is now stuck in driveway in reverse so I cant even start it
i have had this problem before. driving around 45mph still in second gear. when u let off of gas van lurches as if you were downshifting to stop. however, van is automatic. doesn't make sense. van is low on oil and causes gears to stick. like some insane nightmare. give it a quart of oil and you will find the van easily changing gears and acting normal again. don't ask me why or how, but i speak from experience
well if you have a lot of millage it could only be the gearpump in the transy thats finished,unfotuntly ...you cant really change -it without rebuilding the all transy
other than that you still can drive-it but try letting the gear go on by it self ,you could damage your van by doing that !! you mignt not have choice but if you do ...try not doing-it!