I have bought in a bundle/bunch of 500 parts - that includes a brand new 500 crank and a brand new 85 500XC tranny set. May install this XC tranny in 430 engine vs 500 engine it came from. These are brand new. What is it like comparing to the close ratio gearbox ratios to this XC tranny ratios. Is It closer on bottom and wider on the top ?? If I don't use it I will sell it. I also have a really nice 430 CR tranny set here to use. Mostly ride closed course MX tracks but some trails also. Any feedback would be helpful.