Torque specs for front shackles?

[will e]

I replaced my front shackles and the test drive didn't go well. A lot of noise from the front. I can see the leaf springs twisting a bit and the shackles are making a loud clunking noise.
I have them torqued to 100 foot lbs. What's the recommend torque spec?

[OldFarmTruck22]

Loosen them with weight on the suspension, then retorque to 80 lbs. Let us know how that feels.

[tgreese]

It's in the TSM, last page of section 2N in my '82 book. 100 initial, 80-120 in service.

[will e]

Thanks Tgreese, I remembered I had a copy of the TSM and looked them up this morning.

I am wondering if the rear bushings on the front springs are bad too. Might take a quick look at those to see.

[rocklaurence]

I stopped torqueing mine down to 80ftlbs. They are 9/16" lock nuts [the taper is probably worn] and I lightly seat the nut with Red thread locker. Ive never had one come loose and the fastener is robust enough that the thread locker wont strip the threads on removal.

[kjandb]

Hm. My TSM says 35-40 lbs - for a '71. Is it really that big of a difference between '71 and '82?

[akguy09]

Different shackles?

[tgreese]

Aren't the rears of a '71 post mount? That could be significantly different.