Are you running stock bump stops or did you add extensions with the lift?

^ this. How much bumpstop are you running now in the rear? Did bumpstop extensions come with your lift. With stock fenders and 37s you may need up to 4 inch bumpstop extensions whether you have a 6 inch lift or a 1 inch lift. That has absolutely no bearing on your tires keeping out the fenders only bumpstop does

Look at MCE they make flat fenders that have a lip like your talking about. Just and idea

The rig is on a long arm full adjustable Y-arms and they're sitting perfectly centered. Stuffed the wheels before to check for proper slip yoke fitment and at full stuff, as best as I can measure, the fronts are about 1/8" forward if center. Rears are perfectly centered when stuffed and about 3/16" rear of center at ride height. Again, that was measuring as best I could so measurements might be off just a tad.

I think there's a misunderstanding.
What they are saying about measuring bump stops is to stuff the rear tire and measure the distance from the bump stop to the contact point on the axle. If your tire makes contact with your fender before the bump stop touches the axle, then you need more bump stop. The bump stop will limit your axle's up travel to prevent the tires from moving up vertically too far and tearing off the fender. I'm not trying to be rude at all, just wanting to make sure we are all on the same page.

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Oh man, yeah, it only has 2" of bump stop extension right now.

You need around 4" for 37s and stock flares.

Also, a wheel is not fully stuffed unless the opposite side is fully drooped. And axles have lateral movement as well so take that into consideration when measuring and doing final testing. If you're going to trim I would do that first.

I love this forum! You guys are great man, no joke. I really appreciate all your help. Looks like I have enough info to drive it into the shop and start checking it out. I'll let u all know what I found. THANK YOU!

Actually, the comment on axle centering was about the axle movement when stuffed. The front moves up and forward, the rear moves up and back. Depending on where the tires are contacting, I was thinking that axle centering could be a consideration in a "minimal trimming" situation. :dontknow2: