the gearbox on my 109 series 3 has quite a bit of rattle in it at the top of its rev range and will need an overhaul or replacement when i"ve finished the 101 other little jobs on my list i was looking at glencoyne engineering"s web site and was interested in the custom service where they can change the ratio"s to suit your needs and as i have a large compressor that runs off my p.t.o so can"t fit an overdrive was just wondering if anyone had used this service or new much about it weather it"s cost effective and what sort of improvements it makes i am looking for a bit more top end and don"t mind loosing a bit lower down as i pull away in 2nd gear most of the time anyway thanks for your time paul