when shifting into 5th the truck will clunk into gear and the shift will shake the whole truck but it doesnt happen all the time. if i use the tap shift i can go through the gears with no issue at all at wot but if i put the truck in drive and hammer it up onto the freeway or cruising flat on the freeway it will occur. this is a new issue only has been happening for about 2 weeks. under normal load even 75% throttle the shift is fine, and at any temp under 150 degree its fine. i havent changed the spin on for about 20k and i am running a hypertech max energy at level 3. where should i start?