sound metal grinding on 1994 Nissan Pickup (D21)

hi! i got a 94 nissan hardbody 4cylinder manual. i used 1,2,3 and 5th gear u can hear sound like a grinding metal but if i shift to 4th gear hear nothing, what's wrong with my truck?

1 answer
I think your transmission bearings are failing. It will require an overhaul to fix it.
Get to a Nissan specialist or a transmission shop for an estimate.
Here's a directory link for you:
http://repairpal.com/directory?address=22307&car_brand_names=Nissan