87GMCJimmy
Adventurer
As a PW owner, I'm not enamoured with the change in the rear diff. Good luck with it off road - you loose over an inch of clearance. The 10.5 is a rock anchor with tires aired down, even with 35's. On stock 33's it will be right about 4 to 5" clearance when at 20 PSI. You'll need 37's on the truck to have the same clearance I do on 35's. That will require regearing and a minimum of a 4" lift too boot.
As far as the coils go, it should eliminate the biggest problem a PW has in soft terrain; axle hop due to spring wrap. Wait until Carli, Icon, and AEV tune a set specifically for the truck - it will be awesome.
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I agree, I drag the heck outta my 10.5" rear even with 37s!!! Don't need 4" lift though, I have a mix of Carli/Thuren that netted me 2" over stock stuff on my Power Wagon and I fit 37s totally fine!!! Also, IDK about need to regear for 37s, although the 6.4L's numbers aren't any huge jump, their curves may be much better. BUT, at least the 11.5" gives the option of regearing!!!! Aside from one person's claim that 10.5" Corporate 14 bolt gears can be modded to fit (never saw any proof of that claim though), I have not seen any mention of any gears lower than 4.56 gears for the AAM 10.5.