I stripped the threads on a set of 1/2" round u-bolts that came w/ my AllPro u-bolt flip kit, and I also saw one of those 1/2" round bolts break on Scott Wilson's old 4Runner SAS. Since running the 5/8" bolts, they have held up fine, I think I run 3.25" in all 4 locations up front, 3" may fit on the long side, but it was easier to get all 4 the same, I'll be running 3" on the rear axle.

U-bolt flip kit info

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code