Two things can happen
The end of your shift stick can get worn out and slip out of the track. Probably means you have detent problems too. You can pull the shifter out by pressing down on the circular sheet metal piece that is at the base of the shifter and turning it (Counter clockwise I think). You can look in there and see if the shaft onthe right is forward and you can move it back and then put the shifter back in. You will probably want to have the top of the tranny rebuilt if it does it again.
the 2nd thing is you may have a bent fork that slipped off and now is holding the 2nd gear in.
You can pull the top of the tranny off by putting it half way into reverse. (If you can get it into reverse) this is a lot more work as you have to put the floor mats up and remove the tranny tower cover from the floorboards.
If you have a bent fork, or just worn out rails, you may want to get a new tranny.
A noise that goes away when the clucth is depressed can mean the tranny is getting worn, as the tranny will stop turning when you push in the clutch. It can also mean a lot of other things too, like a worn carrier (the tube around the splined input shaft that the throwout bearing slides on.)
Hope this helps
Good luck
__________________
Scrub
Sisters, Oregon - Home of the Sisters Rodeo.
70 GMC 1,000,000 + miles
72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.
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