1990 chevy 2500 6.2 128k. its a low with a 3 spd. wont go in gear just grinds any ideas. synchro? clutch? slave cyl? let me know thanks.

sounds like the clutch is not disengaging. if it is a hydraulic clutch, check the fluid reservoir. If the reservoir is empty, check for fluid on the ground then look above the fluid puddle for the leak :) or you can fill the reservoir again and have someone pump the clutch while you watch the fluid spew!