I did some searching but was only able to find the one post that listed the torque spec for the u-bolts/nuts for the rear axle spacers (250/350 4wd).

Can someone confirm if the info below is correct? Thanks

Tighten u-bolt nuts in 4 stages using a cross pattern.

Stage 1 - 48 lb-ft (65 Nm)
Stage 2 - 96 lb-ft (130 Nm)
Stage 3 - 148 lb-ft (200 Nm)
Stage 4 - 195 lb-ft (265 Nm)

 

There seems to be a few varying specs out there. I set mine to 160ft lbs as I found one thing that stated 195 and another that said 150ft lbs. Sorry I know this doesn't clarify your question though.

 

Per Ford 2015 Service DVD

With the suspension at curb height, tighten the U-bolt nuts evenly in a cross-type pattern in 4 stages.
Stage 1: Tighten to 65 Nm (48 lb-ft).
Stage 2: Tighten to 130 Nm (96 lb-ft).
Stage 3: Tighten to 200 Nm (148 lb-ft).
Stage 4: Tighten to 265 Nm (195 lb-ft).

 

.....and.......
Unless it is specified in the torque spec ::
Use NO OIL on the threads to do your torquing... Any lubricant will cause the torque to be wildly inaccurate. I've seen a lot of stripped threads by people lubricating them and then torquing to spec.

 

Thanks guys. Appreciate the help.