First have the filter and fluid changed. This will show if anything is in
the pan that might be a further sign of troubles. While its open, have the
bands adjusted. The 1-2 shift directly dependant on the front band being
adjusted properly. Check for trans codes in the PCM. If you have a truck
other than a 97-99, you'll be able to do this yourself by turning the key on
and off three times, then leaving it on and reading the odometer display.
After doing all that, see how things go.
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