| lug nut torque [message #366890] |
Mon, 20 September 2021 20:12  |
ktcnyc
Messages: 25
Registered: September 2020
Karma: -1
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Junior Member |
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Hi folks - I have steel wheels and new 16.5 tires - is it really true that the lug nuts are torqued to 250 lbs. ? I'm having brake work done at a truck repair shop and I want to give them a heads up.
Thanks.
Kevin Cloutier -'77 Eleganza II-455, 6 disk brakes, Edelbrock carb, headers, , resident of NYC and Dingmans Ferry, Pa.
'72 MGB-GT & '73 MGB convertible
Member GMCMI since 8/20
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| Re: lug nut torque [message #366892 is a reply to message #366890] |
Mon, 20 September 2021 20:35  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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That IS the spec, although I don't think most people follow it to the letter (or number as it were).
I believe the friction between the shoulder of the nut and the wheel surface has something to do with that high torque spec. I think most people have found that the Alcoa (different type of lug nut) spec of 140 ft lbs is sufficient. I would suggest that if you DON'T torque to the spec, you should check the torque after putting on a few hundred miles.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: lug nut torque [message #366897 is a reply to message #366890] |
Tue, 21 September 2021 07:21 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Senior Member |
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Rather than wheel nut torque, I think breaking the rear shocks is more a problem for a non Gmc familiar shop.
Put rear weight on the bogies with a jack, then let down air pressure in the suspension air bags before full extension.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: lug nut torque [message #366903 is a reply to message #366890] |
Tue, 21 September 2021 10:40 |
kingd
Messages: 592
Registered: June 2004
Karma: 2
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Senior Member |
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I have a 1977 SOB motorhome with steel wheels and factory lug nuts. They are flanged nuts made in
one (1) piece so not swivel, like stock GMC MH lug nuts. I still have the factory owners manual.
The specified wheel nut torques is 300 to 350 lbs/ft. Yes I have a great big SNAP ON 3/4 drive
breaker bar and SNAP ON socket to fit. To loosen these takes all 225 lbs of me on the breaker bar
bouncing up and down. You'd better be ready when they come loose with a SNAP. I have a rated
400 lbs/ft air impact gun that will undo them just. So I'm not surprised at the spec for a
GMC MH. REMEMBER DO NOT use the steel wheel torque spec for aluminum wheels will ALCOA style
nuts. JWITIK (Just what I think I know)
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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| [GMCnet] Re: lug nut torque [message #366904 is a reply to message #366897] |
Tue, 21 September 2021 10:33 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Just have them jack under the bogie boxes for sure. Also, under the lower
control arms, or under the engine front cross member, NOT THE RADIATOR
SUPPORT.
Jim Hupy
Salem, Oregon
On Tue, Sep 21, 2021, 8:28 AM Tyler wrote:
> Rather than wheel nut torque, I think breaking the rear shocks is more a
> problem for a non Gmc familiar shop.
>
> Put rear weight on the bogies with a jack, then let down air pressure in
> the suspension air bags before full extension.
> --
> 1975 Glenbrook, 1978 Royale rear bath
> Raleigh, NC
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| [GMCnet] Re: lug nut torque [message #366905 is a reply to message #366904] |
Tue, 21 September 2021 11:16 |
Jerry Wheeler
Messages: 246
Registered: January 2013
Karma: 2
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Senior Member |
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No, the lug nuts should be torqued to 140 pounds.
JR Wheeler 78 Royale 73 Painted Desert
Now living in Oregon
On Tue, Sep 21, 2021 at 11:33 AM James Hupy wrote:
> Just have them jack under the bogie boxes for sure. Also, under the lower
> control arms, or under the engine front cross member, NOT THE RADIATOR
> SUPPORT.
> Jim Hupy
> Salem, Oregon
>
> On Tue, Sep 21, 2021, 8:28 AM Tyler wrote:
>
>> Rather than wheel nut torque, I think breaking the rear shocks is more a
>> problem for a non Gmc familiar shop.
>>
>> Put rear weight on the bogies with a jack, then let down air pressure in
>> the suspension air bags before full extension.
>> --
>> 1975 Glenbrook, 1978 Royale rear bath
>> Raleigh, NC
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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