This might help. From ORD
[FONT=Arial, Helvetica, sans-serif]New obscure track width info:[/FONT]
[FONT=Arial, Helvetica, sans-serif]While swapping axles around this spring, we found some stuff we didn't know about and thought we'd pass it on. One big thing is that the change from 8 lug back to 6 lug on our 10 bolt front made the track width a full 2" narrower! The difference is in the wheel bearing hub itself, the 3/4T hub moves the wheel out 1". This helps explain some tire clearance problems we've seen when swapping to 3/4T running gear. [/FONT]
[FONT=Arial, Helvetica, sans-serif]The rear ends seem to be 3" narrower than the frontends pretty consistently, with the exception of the van 1/2T rears, which are 4" wider than a truck 1/2T rear. [/FONT]
[FONT=Arial, Helvetica, sans-serif]Here are some measurements we found:
6 lug 10 bolt front - 67 1/2"
8 lug 10 bolt front - 69 1/2"
1/2T van rear - 68"
14 bolt (10.5) rear - 67"[/FONT]
[FONT=Arial, Helvetica, sans-serif]These are all wheel face to wheel face.[/FONT]