In the past couple of days the little 3.0 raider has been having auto tranny issues. it started out reving close to 4k rpms before shifting to overdrive. now it does not go into overdrive and does not want to go into 3rd gear unless it gets well over 4k rpms and the needle is bouncing. No leaks plenty of fluid. No sounds to allude to anything going on. i did smell something but could not put my finger on what the smell was. Any advice or help. just curious if my 91 lwb tranny will swap in with no worries. i think so but wanted to make sure.

91 Montero LS "Sandstorm", Auto, Dual Bouncy Seats, 2" Suspension lift, 2" Body Lift, GENII front IFS, 32" MT tires

89 Raider "Trailbreaker", 3.0, Auto, Dual Bouncy Seats