Width, spring perch (ctr to ctr) and pinion to housing ends ?
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Wms is 59.5, outside perch to outside perch is 42, inside perch to inside perch is 38, center to center is 39.5...
SVT
Hmm, might be just the right width overall with the 15 x 10's I have with 4" backspacing. I think I've hit on an easy way to narrow the rear on F150's.........59.5 + 12 (two 15 x 10's with 4" B/S =12" of wheel outside the axle flange) = 71.5. 60 + 5" (width of the 2 axles outside the housing) + 7 (width of the two 15x 7 stock wheels w/ 4" B/S) = 72.