I tend to get ahead of the actual problem and forgot to look at the whole scenario. I was all gravel road and putting it in reverse to back up I had no movement so I put it in drive again and just drove through the Gravel Road but as I was going to get back on the Highway Drive disappeared the lower gears same thing one by one I got home to check the fluid level the average normal with running temperature it was appropriate. Uneducated guess tranny filter. Could I be wrong and need to check something simpler first? Let me add that later that day I was able to drive it around from the front of the house to the back where I had no reverse once again. It's sat for 2 days, and I have reverse but pulled it back into the yard to work on it.