2005 Dodge Ram 1500 4x4 4.7l gas. shifts into all gears perfect except overdrive. When I get to 55mph the truck slams into overdrive and chirps the rear wheels, I can speed up before 55mph and drop down a gear until I get to 60-65mph let off the accelerator and it drops into OD without any issues. I can then drive it between 60 and 80 with zero problems. only issue is getting into OD the normal way. Any help would be appreciated.

 

No idea off hand and without any codes it is hard to diagnose. Might wanna take it by a trans shop that will check it for free.