On the topic of 37's and proper fitment. I started to address the bumpstops this weekend. Different suspension setups might need a slightly different solution but this will work well for the 3" Slinky suspension. Just to review, a 3" Slinky kit with 35's is an excellent combination and doesn't require a few extra mods that are necessary to run 37's. With 35's, no front bumpstop modification is necessary. With 37's, you want to have an additional 1" of bumpstop. That could be just adding a spacer to the stock inside the coil bumpstop, but there's an easier solution that doesn't require removal of the coil. The Slinky kit already comes with a 1" taller bumpstop for the rear (it measures 3.5") that is used with 35's. I got another pair of these bumpstops from Kevin at Endless Horizon Outfitters and it was a simple bolt-on bumpstop to the front frame. These add the necessary additional 1" needed to keep 37's for jamming into the wheel arches, but still maximize travel.
Here's the taller bumpstop.
Slinky Parts by
Adam Tolman, on Flickr
Bolted in place using the factory threaded holes on the frame. Note: I think '93-'94 US spec 80s have the holes but not the captured nuts in this location. the '95 and later trucks should have captured nuts. I haven't verified this 100% but this appears to be the case, so if someone with an earlier model wanted to use these bumpstops, a captured nut would need to be welded in or the bumpstop could be attached with two short welds.
Slinky Parts by
Adam Tolman, on Flickr
3.5" total height.
Slinky Parts by
Adam Tolman, on Flickr
I have had some LCP swaybar disconnect brackets installed in this same spot and I had to remove them in order to use these bumpstops. I've found that with the Slinky kit there is very little difference in wheel travel with or without the swaybar attached. But I've still liked having the brackets. One example of why they've been helpful even if I don't regularly disconnect the swaybar, is while on a trip this past summer, the swaybar bushings at the axle came apart and fell out, leaving the swaybar eye clanking around on the pin. It was nice to disconnect the swaybar and pin it up purely for the sake of not having to listen to the noise, but also so I didn't damage the eyes or the pins with no bushing in place.
I plan to modify the brackets so that I can continue to have the option of disconnecting the swaybar.