I have talked to multiple transmission shops about my issue and one diesel shop. Some say it’s my reverse solenoid going out others say it’s not a transmission problem is an engine problem because the RPMs don’t go up. I really hope someone can help me out with this. so sometimes whenever I put my truck in reverse I press the gas and it doesn’t matter how much you press it the RPMs never reach above 1000 RPMs. But I can be in the same spot put it in neutral and press the gas and RPMs go up. The only time it will back up when this occurs it’s when I put it in four-wheel-drive low. also it only happens sometimes. If anyone has had the same problem i’d greatly appreciate the help.