Re: lockright diff.
I've had a lockright in the rear (8.8) of my F-150 for 4 years. It's behind a 300 I6, and a 5spd...with 32" tires. I've put it through it's paces and never had a problem. The truck has extra leaves in the packs, and air helpers, and I've had an honest 4150#'s of seed in the bed to take to the field...when I turned into the field, I was on dry pavement, and I had to come to a full stop...so I was stopped, and turning while accelerating, on dry pavement, with god knows how much weight on both rear tires, and 12" wide tires both grabbing with all their might (and this was the point at which I thought the lock right was gonna bite it), but it held up fine. No signs of wear, no problems, not a single complaint. I've been very pleased with mine.
Moneyless, Will weld for jeep accessories.