I had my 02 duramax on the dyno the other day and even with the dvt locked in fourth it would still upshift into 5th. It would prevent downshifts but not upshifts. Is there a way to prevent this or do I just reflash the tcm with a higher 4th-5th wot upshift before I put it on the dyno? It was still climbing at 3250 when it was shifting.