I have a 93 century,3.3 eng. Going down a slight hill, it seemed as if the transmission shuddered while downshifting. I let off on the gas pedal, and everything was all right. I have 83,000 miles on it. Rides very nice, and since that incident, no problems driving. Is it the transmission, or the engine? Ed P.
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If the problem is due to warped brake discs, you will typically feel a mild pulsing in the peddle when braking firmly. Also, when you are experiencing this shudder, taking your foot off the brake (when safe to do so) should cause it to stop. If that is not the case, I would consider again the transmission. I am on my second Caravan, so I speak from experience. The Caravan transmission should have the fluid changed every 30,000 miles to keep it in top performance, especially if you are carrying any heavy loads or pulling a trailer. When you are slowing to a stop, the transmission must downshift through each of the gears. If it stays in the higher gears at too slow a speed, you will feel a shudder. Sometimes this can be corrected by changing the transmission fluid. Be sure to use the proper Chrysler fluid for your transmission. Typically it is the highest (overdrive) gear that causes the shudder. You can determine this by moving the gear selector from "D" to "3" when you are experiencing the shudder. Other possibilities are alignment, worn stabilizer bar bushings, worn ball joints, and out-of-round tires. Most of these also involve some accompanying noises though. Good Luck.
A TC shudder on a 604 is the first sign of the end. You may can get away with putting a torque converter in it , if you do it soon ( tomorrow).If it shudders going up hill it is most likely not the converter since the clutch is released under load. I would suspect and engine miss first.I am constantly dealing with vehicles that someone has diagnosed as a converter shudder and turns out to be something else , most the time just a bad coil or set of plug wires.
I had a similar problem on my 93 Accord after I accidentally threw the car in reverse at 50 mph, obviously wrecking the transmission. When I got it rebuilt I was told the transmission pump was to blame (clogged with "shrapnel"). I, and your car manual, recommend taking the car in to get the tranny looked at. Especially considering you just had the fluid changed which is what would normally cause the problems you are describing.