[veedubmechanic]

On the linkage for the transmission on the transmission there is some plastic linkage parts. A long metal one with black ends and 2 small white plastic ones. Usually they break and leave you w.o 5'th gear. There about 4.00 each at the dealer.

Also 5th gear is a common issue with older 020 transmissions. There are adjusting shims that move the gear over to make up slack in the linkage ect... But your better off spending 100.00 at the junk yard for a junker trans than taking the 5th gear assembly off and adding shims..