How did I strip this shock mount? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

thebeerbaron · 03-04-2018, 08:45 PM

Where did I go wrong?

72 3/4 ton, rear upper shock mount nut (leaf spring). Took the torque spec from this post:
http://67-72chevytrucks.com/vboard/s...9&postcount=16
EDIT TO ADD: Name: Screen Shot 2018-03-04 at 6.09.33 PM.jpg
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Name: Screen Shot 2018-03-04 at 6.09.33 PM.jpg
Views: 131
Size: 28.0 KB

Upper shock mount is 7/16-20. Torque specs for that bolt size are about half the spec above. See http://www.almabolt.com/pages/catalo...ningtorque.htm
EDIT TO ADD: Name: Screen Shot 2018-03-04 at 6.09.43 PM.jpg
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Name: Screen Shot 2018-03-04 at 6.09.43 PM.jpg
Views: 125
Size: 75.2 KB

I completely stripped the upper shock mount stud before I got anywhere near 140ft-lbs. (see attached pic)

Is the GM spec just plain wrong? Should I just be going with the spec-by-bolt-size instead?

Thanks,
Peter

**mongocanfly** · 03-04-2018, 09:04 PM

in that first link you posted it says 65lb front and 140lb rear for leaf spring and 70 for coil spring......i would have thought they should be the same...I'm thinking 65-70 is plenty...140lb sounds like way to much for 7/16...
the 2nd link don't work...

**PGSigns** · 03-05-2018, 07:45 AM

It looks be referring to the shock mount to the frame and not the shock to the mount. They just get pulled up tight. The 58 is a much better number.
Jimmy

03-04-2018, 08:45 PM	#1
thebeerbaron Registered User Join Date: Aug 2017 Location: San Jose Posts: 6	How did I strip this shock mount? Where did I go wrong? 72 3/4 ton, rear upper shock mount nut (leaf spring). Took the torque spec from this post: http://67-72chevytrucks.com/vboard/s...9&postcount=16 EDIT TO ADD: Upper shock mount is 7/16-20. Torque specs for that bolt size are about half the spec above. See http://www.almabolt.com/pages/catalo...ningtorque.htm EDIT TO ADD: I completely stripped the upper shock mount stud before I got anywhere near 140ft-lbs. (see attached pic) Is the GM spec just plain wrong? Should I just be going with the spec-by-bolt-size instead? Thanks, Peter Attached Images Last edited by thebeerbaron; 03-04-2018 at 10:12 PM. Reason: Added pics to supplement links

03-04-2018, 09:04 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,583	Re: How did I strip this shock mount? in that first link you posted it says 65lb front and 140lb rear for leaf spring and 70 for coil spring......i would have thought they should be the same...I'm thinking 65-70 is plenty...140lb sounds like way to much for 7/16... the 2nd link don't work... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 03-04-2018 at 09:09 PM.

03-05-2018, 07:45 AM	#3
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: How did I strip this shock mount? It looks be referring to the shock mount to the frame and not the shock to the mount. They just get pulled up tight. The 58 is a much better number. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic



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