My truck will only go about 20mph then it feels like it slips. I’ve been thinking it’s because my hoses are lose so I’ve ordered new hoses just incase the old ones are worn out. If that does work. Does anyone know what I’d be able to put in/replace my tranny with? I found another tranny not sure if I’ll be able to use it. Pic#2

 

If the transmission is from a 3rd gen dakota (2005-2011) then it will work. Searching that part number seems to come up with 2003 dakota and 1500. I vaugely recall there being something about the number of teeth on a ring gear, or splined shaft that made older ones incompatible. The 3.7l v6 was paired with the 4 speed and the 4.7l v8 had the 5 speed. If the donor does, or does not have 4wd isn't an issue as the output shaft extension/transfer case can be swapped easily.