failiure

What do ya reckon has caused this then?? Exhaust also never had any carbon build up all the way through the backbox.

Ever since I got my gearbox back after the box was rebuilt with the diff 3rd gear always seemed to have a little crunch at the high end of the rev range, recentlly it's been getting worse and worse and after today the gear just crunches and snags itself into gear. So I'm thinking the 2nd to...