After a TSB search, I found nothing relating to a problem with the 3-->4
shift. Can you point me to your source?
I can't think of much that really sticks out as a problem area on these
cars. Maybe consider changing the thermostat. I've seen several engines
cooked to the point of needing cylinder heads and radiators replaced
because of this. Even so, the failure rate isn't bad. Just something to
consider for the cost-benefit factor.
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