In my experience , Using just a clutch to chain on big tire bikes will tend to go through clutches alot faster. (Ask 71 Dodge) I think he went through 4 clutches trying to turn those 22's on his T777 :laugh: Who ever buys this , get a hold of me and I will give you the measurements of the jackshaft. I am sure one of the Metal Gods on here could fab one up.. Hell I would even take a couple extra, because it seems like 90% of the Boonies out there are missing them:shrug: