I thought they were the same to, But the pattern on the 05' F350 dually is right at 7.75 and on the 06' f250 it is 6.75". I measured and remesured and tried to switch wheels. ITS NOT THE SAME. I bought the 06 off the lot new and the 05 has no mods either. the vin on the 05 f350 reads 1ftww32p75eb43xxx. I find it hard to believe that so many people have just assumed that f250/f350 were the same but i don't know what else it could be.

Are you sure that the F350 is not a 10 lug F450? I have never heard of a bigger 8 lug pattern on those but I could be wrong. What were you doing trying to switch wheels between a dually and a SRW anyway?

Never mind, Its DRW is larger then SRW, i didn't know.

Never mind, Its DRW is larger then SRW, i didn't know.

Are you sure you have the years and F?50 info right?

The F450/550 did use a larger 8-lug pattern than F250/350 from 99-04 or so.

The patterns have always been a bit diffrent on the F series.