Buster wrote:"My Daughter's 1994 Caravan will not shift into overdrive.
The Tranny was rebuilt a couple of months before she bought it. The
motor does reach normal operating temp. What can be the cause?
How many miles are on the vehicle, which engine?
Was it a reputable shop that rebuilt it? There are many upgrades
required to be installed into these during a rebuild, including the
I had all kinds of problems with a 604 when they failed to replace the
controller -- which had undergone at least two upgrades.
In other words, when I finally took it to a reputable shop, they
mentioned that this 'rebuilt transmission' was still using the first
generation controller, where by that time it should be the third -- so
naturally the unit was not compatible with the upgrades hardware
included in the rebuild kit, and wouldn't control it properly.
I'm not saying there's a high probability that's the problem with
yours, just that there are a LOT of upgrades on those, both inside and
Are you sure it's not shifting into overdrive, or if it's the torque
converter lockup not working?
On May 4, 8:08 am, email@example.com (James Goforth) wrote:
i replaced many of these transmission with factory rebuilt
transmissions and they too had problems with the electronic valve
bodys with the big computer plug the 604 were noted for the snap rings
breaking and then you know what happens next they go to shit real fast
but they also have problems with the valve body good luck with your
I have one with a similar problem. It seems to overrev in each gear, and doesn't
shift into overdrive. If I drive a few miles, then shut it off and restart it a
minute later, everything works great. One time on the freeway, it went into
neutral - engine just reved up until I let off the gas. Coasted down to 40-45,
then it started working again, but with the no-overdrive, overrevving problem
until I turned it off/on again.
The previous owner had the overdrive solonoid replaced, with no improvement. A
dirfferent shop removed the computer to try a substitute one, and claimed the
problem went away, and stayed away after re-installing the origional one. I
bought it, and the problem came back a few days later.
Could this be a speed sensor or temperature sensor problem? Any other ideas.
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