Quote:
Originally Posted by Clem Clement
car resting on the ground. thread and cross pieces lubed with 30 weight oil. 39 pickup started with 10-20 Psi torque. Worked them all up the 50psi. Nuts are 7/8th. There was some crunching of dirt and rust as the spring leaves moved.
I'll retighten up to 76 after I gain strength form my nap
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Fasteners should be tightened without any sort of lubricant unless specified. It will reduce the amount of torque required to reach X amount of bolt stretch, often in an unreliable manner.
These numbers are just wild examples, but a torque of 50 ft-lbs (lubricated) would be like 75 ft-lbs (unlubricated). It makes it very easy to over-stretch the fastener.
I doubt Ford specifies use of any lubricant on such spring fasteners.