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Transmission will sometimes shift when hot. wont shift when hard. Whats wrong?

(1992 Mercury Topaz)
in Monte Vista, CO on August 18, 2012
I took motor off to fix harmonica balancer and main bearings when I put motor back started right away. Now transmission sometimes shift when hot. i changed fluid and filter and that still wont help.
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Popular Answer
of Greg's Orange Auto on August 18, 2012
scan for trans codes and post or seek free diag at aamco
on August 19, 2012
Re-check all linkage and related adjustments (electrical also)-make sure connectors are tight.
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