Hi Alision man. I have a IHC truck s1900 with a MT653 5 speed, with only reverse in all gears. It has no noise and pulls great in reverse only, no neutral. I dropped the oil pan, and it is very clean,and no metallic or clutch parts found in the oil pan. Filter is normal,shift linkage works correct, the oil does not smell burnt. What should I be checking out next?