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Re: torque converter lock-up
I am unsure if what I say applies to a Caravan, so take what I have to say with a grain of salt.
I worked on a 92 Spirit with the 3-speed transmission with a problem that seems to be the reverse of yours. You seem to want the shift speeds to delay and stay in a lower gear. The problem I saw was that the transmission would upshift and downshift at higher speeds than normal (3'rd gear at 46mph instead of 35). The car would drive mostly in second gear around town, but on the highway it was ok. The problem in this case turned out to be a transmission cable had fallen off the gas pedal.
See if your Caravan's has a cable connecting from the 3-speed transmission and going to your gas pedal. This is a different cable than the one going to your motor's accellerator. That cable is used by the 3 speed transmission as a vehicle speed indicator. In the old days with carbertors, there was linkage to the transmission to cause downshifting on hitting the gas. This cable also has something to do with the modern day equivilent of that.
It sounds like you want to adjust that cable, but I don't believe it is possible. If you disconnect that cable from the accelerator pedal, the up/down shift points occur at higher rpms, The PCM will also set a code 37, but the CES light will not go on. The code 37 just means that the PCM has detected that the transmission is not shifting at the preprogrammed speeds.
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