Gearbox 3Rd To 4Th Syncro Issue Gen 6 2L Gt St 202

[jimmy b]

had my 6th gen 2l gt n reg 96 for around 5 monthes. all fine with 131,000 miles.... yesterday ... car has just started crunching / & feels "notchy" when changing from up from 3rd to 4th..& back down from 4th to 3rd .sometimes it struggles to select reverse....is it a replacement box/rebuild..or will some fresh fluid sort it out...car is fine apart from this..car is worse when cold..imainly do short trips eg 1/2 miles max.work /school max..but im taking it to Scotland from Essex on tues for 4 days..should I be worried???all other gears are fine..any help /info much appreciated..if it needs a new box ,clutch etc..how much should I look at paying?? any used gearboxes here for sale??