Recommendations for a gearbox refurb.......

[88 Zed]

Hi all, I'm looking for recommendations for getting my manual gearbox refurbed. It's a bit notch when cold and if your too quick it's crunch in 3rd.

Also, is it at all possible to change the gearing?

I'd like it a bit more like my EP3 type R gearbox was apart from I'd have 6th as a cruising gear.