Box to frame U Bolts

[Hanno Spoelstra]

Excellent info Jordan, thanks for sharing!

[Jordan Baker]

Im about to install my box to frame bolts but I'm not sure if this is correct. The shop gave me plates long enough to clear the wider channel on the box frame. They said to then just use an impact gun and tighten them right up. My questions are is it fine to have a gap between the rods and the truck frame? On the inside do I need to make some hard wood spacers?

[charlie fitton]

Twist them so the the shaft of the bolt is as close to the frame as possible to avoid having the top and bottom plates flex under load.

[Phil Waterman]

Hi Jordan

Yes, too the wooden blocks, particularly as there are service bulletins to install blocking to CMPs in service.

Without the blocking would be careful about over tighing the bolts, would be concern about the open side of the channel bending.

I tighten my bolts by hand, and used Locktight on the threads, generally check them in my bolt check of drive shafts, links and wheel lugs in the spring.

Cheers Phil

[Jordan Baker]

Ok thanks for the advice Charlie and Phil.

Does anyone have a copy of the service bulletin for the wooden blocks they can post up? I've gone through my bulletin book and didn't see it.

[Hanno Spoelstra]

Jordan,

See my pics above.
The front ones have a wooden spacer block, this is a little wider than the channel it sits in.
The rear ones are next to the cross member, at that point the chassis rail is strong enough, so no wooden spacer needed.

HTH,
Hanno

[Jordan Baker]

Picked up a number of NOS wooden frame blocks yesterday. There is a number of different sizes to fit the different sections of the frame.