My 2004 fx4 seems to not have a lot of power when it is in reverse. It does not slip but when I am backing up on a hill or with a trailor, it seems like I have to really get on the accelerator for it to back up. It seems to take a lot of rpm's to move the truck. Anyone else have this happen?

 

No, I haven't had it happen, but if it takes a lot of RPM's to move the truck, then it's slipping. Check the fluid level if you haven't already done that. A transmission flush might help, but if it doesn't, then you just waisted the cost of that. I would take it to a reputable transmission shop and get an opinion or two.

 

to back my truck up in my driveway it takes a fair amount of rpms but my driveway is pretty steep so that's to be expected. Other times I have not noticed the increase in rpms in reverse.

 

I thought if it was slipping the gears are not engaged and it does not move.. The truck does fine on flat ground just needs a lot of power to back up a hill or back up a trailor. It will go... but needs more acceleration than what I would think is normal.