Gear up then
1999 ford explorer 4.0 manual transmission gear shifter wont fit on shaft
synchro plates went out
why reverse wont go in on 2004 town car
2004.
my 94 Toyota corolla will not go into any gears .
The clutch is bad or out of adjustment.
bad transmission..... expensive repair.
Most likely a broken gear cluster
Go to a U-Haul dealer they have the wiring jig you'll need.
if you mean it wont go into gear and it grinds like a sob but other gears still work synchronizers. if you mean the shifter is loose an cant find the gear anymore - linkage. if it wont go into any gear sounds like a clutch problem
My first suspect would be the clutch. Have a competent mechanic take a look at it.