T5 box wont select 4th gear
 

Hi, got a t5 box and when going up the gears it wont go into 4th, now it can be done with quite a lot of force, dosn't grind just hard to get in.
On the way down from 5th it goes in no problem.
Can anyone gimme an idea of what the problem may be??

Many Thanks

synchro ring and shift plates are damaged common problem

Thanks for reply. Is this what i need?

http://www.burtonpower.com/baulk-rin...r-gbt5501.html

and where can i get shift plates?

cheers