72cutlassdog

My pick up truck 10 series 262 4.3L will not go into reverse at all. However it will go into drive. When I first start it from being cold it will shift into drive and I can drive it with no problems. But once it warm up and if I park it then try driving it again it will not go into drive. It's not catching. The question I have is this a simple fix or should I just get a different tranny? Any help is appreciated.