I imagine this has been discussed, but I am in need of help.. 97 4.0 AX15 219000 miles. So about two-three years ago, I changed the oil in my 5 speed. I used 10w-30 synthetic. This was great it shifted perfect. Well now I am having an issue with shifting. I have push extremely hard into first, and it will only go some of the time. I feel I am going to break the shifter if I push any harder. Second gear is the same way. There is no grinding unless I am attempting to stop and go into reverse. I am currently at the point where I have to turn the engine off shift then restart. Also the shifting is getting the same way in 3-5 gears. I am going to drain the fluid tonight and put 75w-90 in and see if that helps. If anyone else has had this problem, let me know what you discovered. Oh the clutch seems fine.