Just chiming in to add more fuel to the diff drop or not debate with the GX =P because what fun is an enthusiast forum if we can’t go round and round on topics like this?
I have a drop installed on my 470, but only because the shop that did my cv axles wouldn’t warranty their work on a lifted truck without it. NBD, I don’t mind installing the drop if it means I get a 3 year warranty on cv axles.
The reality is, at least for the 470, the diff drop nets you like 1/3 of an inch drop for your cv axles. I’m no engineer, but that just doesn’t seem like enough to meaningfully impact the wear and tear on CVs.
While the spacers are about an inch, they’re only installed on 1 side of the diff. So you don’t get the full inch.
IMO, it really boils down to preference and peace of mind. Is ~$70 and 20 minutes of time going to make you feel better about your cv axles? Yes? Then do the install. Otherwise, don’t worry about it.