Contemplating wheels, tires, diff, etc, did some measuring with a plumb bob, posting for future reference. Should be useful in making decisions about wheels, moving springs, mini-tubbing, shortening diff. etc.
It allows me to consider purchases that may become available at any time.
Frame to inner side of spring (ISS)
3 3/4"
ISS to brake drum
6" (limits wheel backspace to 5" or so depending on tire)
ISS to inner fender lip (IFL)
11 1/4" (limits tire width to about 10.5" assuming perfect backspace - 1/2" can be gained with fender lip trim)
Frame to IFL
15" (max tire width with springs relocated is about 14")
IFL to brake drum
5 1/4"
Link to Mopar axle lengths.
http://www.moparts.org/Tech/Archive/axle/16.html
A body is
57 1/8" drum to drum (I got 57"). To axle flanges is
52 5/8"
Explorer 8.8 is 59.5" disc to disc. This axle allows for an extra 1 3/16" backspace (total about 6 3/16" - bullitt 17x9 has 5.94 BS - OK, 17x10 is 7.27" - too much)
This allows about 1/2" tire clearances. I've not accounted for the upper wheel housing profile and how that may impact a taller tire. I suspect tubbing is needed for tires well under the 14" zone.
Of course anyone using this should measure for themselves - at least a couple times!