70 front frame to datum

[Dennis D.]

Working on a alignment problem. Checked the front frame to the ground. 11 1/2 ". In the aim the front vertical measurement is 14 +" from frame to datum.(ground?) No way its out 3"!
I have 235x15 instead of stock. Sure this doesn't account for it. Could something be out or worn that much, or am I reading that vertical measurement from the front of the frame wrong.
BTW, that same 14+ is repeated a few more times along the side of the frame. seems like the level height for reference. Any ideas?

[Wayne W.]

Re: 70 front frame to datum

The ground datum in the frame specifications does not refer to the physical ground, but a ground plane. The ground plane is varible. I could be 11 inches or 11 feet. The important thing is that the mounts and guage holes are measured to a known datum plane. You need to determine the relative height of the points with reference to a known position.

[Dennis D.]

Re: 70 front frame to datum

Thanks Wayne. When I saw the same height measurement going down the side in a few locations, I thought that might be the case. I guess the next question is, what is a good range for an actual front vertical measurement ?