92 4r 4x4 wont go on reverse

[borras]

it works in all gears except on reverse, sometimes if i rev it a little it will move a bit on reverse and if i put it on 4lo it will slowly move on reverse. I had a little oil leak but i checked the oil level every day to make sure it never ran dry...
What can be causing this problem?

 

[Hyde802]

What engine/tranny do you have?

Check your fluids.

 

[borras]

3.0L AUT 4x4, fluid levels are ok, even put in a Lucas Tranny fix and it still not working