Happened today, really hoping it's not the shift fork. I downshift and rev match through all my gears, and it happened when I downshifted from 4th to 3rd. If I put it in 3rd slowly, it won't grind. I still have the gears, it's just grinding reaaal bad when I try to go into them. 1st gen, v6, 4x4 and of course 5 speed with 151xxx miles. Please help. Been going from 1st, 2nd then to 5th.