F150 1991

My truck for some reason Just shuts off when going in reverse...but not all the time. I've checked transmission fluid levels are good and fluid color is normal. Don't know what it can be. It's been doing this for awhile now. I did some research but came up with transmission filter is loose and slides and cause it to miss and shut down while reversing. But honestly I don't wanna even mess with the transmission. Lol Any idea what it can be?

When you say shuts off are you talking sputtered and dies or just stops like the key was turned off. Also is it as soon as you put it in reverse or when you give it gas to start moving.

If the filter was loose it would just not move. It wouldn't shut the vehicle off.