Question about lug nut tq spec
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Question about lug nut tq spec
On my 79 350 4x4 srw I looked up in my owners manual the lug nut torque spec and it had a single caliper 145 ftlb and dual caliper 220 ftlb, both for 9/16 studs. I was assuming that meant single or dual piston caliper and my fronts are dual piston. Is that correct? Seems like a huge difference in torque
Cargo Master
Joined: Jul 2010
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From: York, Pa
The 4wd 250 or 350 should have had 1/2" studs not 9/16". I think some 2wd's could have had 9/16". The specs you have would be more believable for 1/2" or 9/16", maybe 220ft lb is right but it sounds like a lot.
Postmaster
Joined: Nov 2011
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As a general guideline, I use 75 ft lb for 70's era 1/2" lug nuts. Even this is in some cases higher than the FSM. The dual piston calipers themselves take much higher torque for assembly and have larger bolts. Is this what you are looking at? Suggest you measure your wheel studs. If 1/2" I would use 75 ft lb and check regularly until they show no signs of movement on check. If 9/16" not sure... but not 150 or 200+ ft lb!
Laughing Gas
Joined: Oct 2015
Posts: 991
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From: Dallas, OR
Almost everything I have ever worked on has been 100 ft/lb or less with the only exception being really large trucks. 145 would be high for passenger size vehicles, but still believable. 220? No way that is right.
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This was in my manual. I was going off the 350 spec not the 1/2" which is what is on the truck.. Loosened and retorqued
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Laughing Gas
Joined: Nov 2013
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From: A dirty little town in OR
I also bring a WIX filter to the quickie-lube joint when I get my or the GF's daily driver's oil changed...they don't seem to mind. In both cases I get either understanding nods of approval, or "freakin' old-guy" looks of annoyance.
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Cargo Master
Joined: Jul 2005
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From: Kansas
not correct, has nothing to do with the caliper...the torque values are referring to single/dual wheels. The dual wheels do take more torque because of the difference in wheel design.
Cargo Master
Joined: Nov 2011
Posts: 3,354
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From: Great American SouthWest
Every time I use Discount Tire, they use a torque wrench on the final go 'round. One of the reasons I changed out the left-hand studs is that their torque wrench is right-hand only. Confused the heck out of the kids...
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