AZB755V8

I have seen the short round tanks from time to time. Just so happens that there is one right here, maybe for sale,

Take a look at the two rust free B cabs for sale recently. There is a shorty drivers side tank on that frame brackets and all. There could be a nice passenger tank there too.

It just so happens the colors on that frame and cab match the B75 I got from Texas in 1996 and still have. My cab and tanks where in real nice shape.

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.