have your batteries checked. they have to be in good condition. even if your truck starts fine one could be marginal and cause problems. batteries are big noise filters. electrical noise is what causes these trans.tc problems. this is what i as told by Bill owner of DTT transmissions. it worked for me, it might for you. also a noise filter from DTT.
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98.5 24 valve dtt trans. 4" exh. guages edge ez afe filter bd exh. brake