98 S10 tranny problem?

My son called me today to pick him up. His 98 S10 would shift into gear but wouldn't go forward or into reverse. New clutch 6 months ago, hoping something simple like low gear oil or worse? Any ideas?

Thanks

My son called me today to pick him up. His 98 S10 would shift into gear but wouldn't go forward or into reverse. New clutch 6 months ago, hoping something simple like low gear oil or worse? Any ideas?

Thanks
You need to have a look at it.
2 0r 4W?
Check fluid level and shift linkage first.
If fluid and linkage is ok then if no reverse and no transmission out put it is a dead duck.
Got any warranty on new clutch job?