Trans or tc has been acting up for a while now, under heavy acceleration truck will go into neutral from the 2-3 shift and reengage once I let off the throttle. Only code I got for it was p0776 once, tc was out a few months ago looked good at the time tailshaft is tight now. Ordered new speed sensors waiting for them to come in now speedo was jumping around a bit last winter any chance this could be my problem, any advice is greatly appreciated.