The A4LD transmission is the weakest part of the 91-94 explorer. It is likely that your transmission has failed.
What would cause the 1995 Nissan Pathfinder not to go in forward or reverse?
Having it on "PARKING"
The transmission is broken. Take it to a shop.
clutch plates could be welded to gather
Is there park and nurtural?
Inspect your brake pads. I would suspect they are worn out.
Burnt forward clutches/ The forward cluth pack is stuck/welded together.... You need a overhaul...!
If this is an automatic transmission, more than likely the transmission is on it's way to the junkyard. Usually failing transmissions lose reverse first, then the higher forward gears - last will be the lowest forward gears.
* cause it needs to be put in drive to go forward
the letter d
no oil in the tranny will cause the bands to streatch and will only allow your trany to work in revers
Shift linkages not put in the correct spots.