AZB755V8

Hi, New here but the math is EZ. What you have is 1900rpm's ~ .86 Trans overdrive = 2,209RPM's I think it is .86 for your Eaton 13 speed. 2,209 ~ (gear ratio) = Y Tire roll out in feet = Z Z for 22.5's = 11.00 Z for 24.5's = 11.52 Y x Z x 60 ~ 5280 = MPH 5280 feet in a mile 60 minute in an hour This is like you said for what you have now 499.84 x 11 x 60 ~ 5280 = 62.48MPH Reducing the equation Y x Z x .01136 = MPH This works for any ratio and the two tire sizes For 4.17 ratio and 22.5's 529.736 x 11 x .01136 = 66.19 MPH I have 3.76 rears in my RW on 22.5's and I like them @ 73.41 MPH Hope this helps as I see rear ratios have come up more than once.

They will interchange. I used a double disc pusher 864 clutch on my 866. All the 866 had a puller Clutch that I have seen.