v7guy wrote:HARDTRAILZ has already verified bigger than 35s will work. He commented that you'd need proper backspacing and to clearance some things to make them practical for offroad use. He's also kicked the rear axle back a couple inches and can still get the tire into the truck with 35s.
I think you misunderstood what I was saying... Or maybe I'm misunderstanding your reply.
37s will physically fit (with some work, like A LOT of offset, tubbing the firewall, rolling the fenders and steering stops).
I tossed this idea around for a long time as well, and I personally don't think there's enough room for a higher angle CV that will hold together. That means a diff drop (like most other IFS lifts) is in order. You will need to lower the subframe 6-8" to have the intermediate shaft clear the oil pan.
So with a diff drop you're going to lose 6"+ of ground clearance. Add 37"+ tires. You'll have less front ground clearance than a truck with 35s and stock diff placement.
27 spline axles may be OK for 37s and light use, but the R&P in the front aluminum housing diff isn't going to last long, let alone the splined disconnect etc. I would venture to say that 37s would be pushing the limits of the 8.6.
I think the recipe for improved IFS on our platform is going to involve the rear sump oil pan, a larger one piece IFS diff (AAM 9.25" maybe?) a new subframe assembly, longer arms, and some reengineering of the steering. Certainly possible, but probably not practical unless you are planning on dune jumping.
Would be way cool to see someone do it though.
