RS1800 gearbox

Are you talking about the Type E (ie. Rocket style) box that came in the car or the ZF that was put in by Boreham and others for competition?. If it is just the Type E it may appeal to someone trying to restore an original RS1800 otherwise it probably wouldn't be worth that much given that most people swap out the gear sets for better ratios. From memory the RS1800 has the casing slightly relieved in places to take the "heavy duty" gear sets, but this can be done to a regular RS Type E too.
Cheers
Justin

John,
Has Mark finally got around to getting the parts remanufactured?. He kept promising for years but everytime I asked him he would say "should be next month" and in the end I gave up. I know Elite Transmissions in the UK have remanufactured their own casings and kits (www.eliteracingtransmissions.com) but I have recently been speaking to Wayne Lee who does most of the ZF work for Gartrac and he is sourcing gear from somewhere else (possibly even Mark)
Cheers
Justin

It is a type E with HD casing (think they used from Transit)
Ratios I believe are 2.29 1st 1.51 2nd and 1.16 3rd
Pic shows changeable gear setup.