My 1998 voyager has a lot of trouble downshifting from third, lots of thumping and shaking, also stalling

distributor probably wasn't put back in right and is off time

Any misfiring while its running? Codes? I did have a dodge once that did this and sometimes wouldnt start back up for an hour or so. After throwing lots of $$$ at it turns out map sensor. Good luck.

If it only happens between third and second, it could be the syncro for second gear is worn out.

Register for free at autozone.com- list make, model, year, and engine size of vehicle, or vehicles. The site has quite a lot of repair procedures that are vehicle-specific.

i could be wrong here but sounds like the toque converter when locked up don't want to let go when you hit the brake or downshift.it can be a solenoid or a control valve sticking.you can either try changing filter and fluid are try adding some lucas trans oil to it at the local auto store.

What are the trouble codes? Can be a lot of things, but still sounds like an ignition problem (bad coil pack?).

Yes, Check Engine mounts & Transmission Mounts.

go to any kragen or autozone parts store, they will run the test for trouble code that turned light on for free, tell them u want an OBD 2 trouble code test, then post the code here.

I had the same problem in my 1999 plymouth voyager. Changed both speed sensors it started shifting perfectly.. Now i get a little thump when downshifting from 2nd to first when stoping change the sensors there only about 20 dollars each its 2 of them on the front of transmission..

Autozone will do a free scan I'm told on 96' and newer. May be an inconvienience, but also save lots of time & money. If it comes up oxygen sensor or some inexpensive part, grab it while your there & change it. Let us know what you find out.