47-55.1 MII Axle Center

[whitedog76]

Originally Posted by MiraclePieCo

It's my observation that it's always better to error on the forward side.

I’ll second that. I dropped a plumb bob on my 54 before I demo’d the frontend. I got 17.75, if I remember correctly. Of course that was on 65 year old leaf springs. I believe the the 18 1/8 measurement is based on an IFS with manual steering and stock spindles. Most folks with power steering will set castor anywhere from 4-7 degrees. If you do the math, that could move your centerline 1/2-7/8 rearward. Drop spindles will also affect the centerline in the same manner, but with a smaller effect.

The ideal way would be to tack everything together, put the front clip and wheels on and see how it looks. That’s not realistic for most folks. I would stick with the directions, if you do anything, maybe move it ahead to 18, that’s it.

[Mains52]

Originally Posted by whitedog76

I’ll second that. I dropped a plumb bob on my 54 before I demo’d the frontend. I got 17.75, if I remember correctly. Of course that was on 65 year old leaf springs. I believe the the 18 1/8 measurement is based on an IFS with manual steering and stock spindles. Most folks with power steering will set castor anywhere from 4-7 degrees. If you do the math, that could move your centerline 1/2-7/8 rearward. Drop spindles will also affect the centerline in the same manner, but with a smaller effect.

The ideal way would be to tack everything together, put the front clip and wheels on and see how it looks. That’s not realistic for most folks. I would stick with the directions, if you do anything, maybe move it ahead to 18, that’s it.

Where were you measuring from? WhiteDog

[whitedog76]

I dropped a plumb bob from the from the frame to the center of the straight axle and measured to the front shackle center.

Chris.