Got a 83 lg4 t5 that has only 87k miles. Shifts good 95% of the time but sometimes on the down shift from 5th to 4th she grinds pretty hard. Although if I go from 5th and just touch 3rd and then go 4th it's fine. This only happens occasionally so that's why I'm stumped. Clutch feels good and has never slipped or shuttered. Going to change the fluid to non synthetic atf this weekend and see what that does . any ideas what this might be cause I'd like to make this t5 last until I find a t56 to put behind my 355 I'm building