Recently, in my 2000 Jetta GLS 2.0 AEG Manual, my 4th gear has been acting up. Every once in a while when I try to shift from 3rd to 4th it seems as if there is a wall blocking 4th and it wont go in so I have to push it into neutral and then into 4th and it slides right in smoothly. This never happens going from 5th down to 4th only up from 3rd to 4th. It also occasionally does this in 3rd gear as well. Every other gear works fine and my clutch appears normal as ever.
Could my synchros be on their way out? Further transmission issues?
Could old/low transmission fluid be causing this? Is there a way to check transmission fluid?
Is it something clutch related?
Any help is greatly appreciated