Having the wrong rear axle shim is putting the u-joint at a dangerous angle (nearly 8°), which is contributing to the noise & vibration in the cab.
FPG $55 x2 plus sh plus tax new Ford shim
F3TZ-5729-AJBG $29 x2 plus sh plus tax
new aftermarket shimIF THE IMAGE IS TOO SMALL, click it.
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Ford specifies that the leaf spring u-bolts not be re-used.
JBG $28 plus sh plus tax
new aftermarket U-bolt set (4 bolts 8 nuts) 
