Big bolt vs Small bolt

396 Signet said
The 4" pattern uses 7/16" studs whereas 4.5" uses 1/2" which are substantially stronger. Many misinformed installers have snapped off or over-torqued the studs on the small pattern.

Yes, and don't forget, often the drivers side studs were left hand thread (the nut spins on the opposite way). That throws people off too.