Lug Nut Torque - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**'68OrangeSunshine** · 01-17-2023, 02:03 PM

What's the proper torque setting for 7/16'' lug nuts on a '71 GMC Jimmy?

**kwmech** · 01-17-2023, 02:15 PM

I take 'em to 80.............1/2'' I take to 95......... and 9/16 I torque to 110

jimijam00 · 01-17-2023, 02:17 PM

70-90?

**kwmech** · 01-17-2023, 02:18 PM

there is always this

**'68OrangeSunshine** · 01-17-2023, 03:36 PM

Thanks Guys.
I consider it a K/10. GMC calls the Jimmy a K/1500. If the truck were a Chevy, it would be a K/5, but GMC never called them K/750s.
Using KWMech's chart from the C+O/H Manual, I'll take them to 55 Ft/Lbs, then up to 75 Ft/Lbs.
I'm running aluminum wheel spacers [1-1/4''] to accommodate some aluminum wheels off a '99 Suburban that have 0 backspacing.
I was running on the freeway, about 60-65 MPH, when I heard a clunking noise that increased with speed. I pulled over. Thinking it may be the plastic fan shroud getting loose and hitting the fan, I used some bailing wire to secure that. Got back on the road and the clanking/vibration came back. Running the motor at idle when stopped, there was no noise.
(I had to get a tow home. About 35 miles -- Hagerty is great.)
So unless it's the transmission [SM465], transfer case [NP205], prop shafts or Universal joints, it could be the spacers wotking loose.
They were installed in July, in AZ summer heat. Now it's cold. [Relatively].
Things were fine before the tire and wheel swap.

**kwmech** · 01-17-2023, 03:42 PM

With the spacers you should consider changing out the wheel studs for 1/2'' I do this conversion all the time. The 7/16'' studs are not really up to the task of larger wheels and tires especially with spacers.

**'68OrangeSunshine** · 01-17-2023, 04:02 PM

Quote:

Originally Posted by kwmech

With the spacers you should consider changing out the wheel studs for 1/2'' I do this conversion all the time. The 7/16'' studs are not really up to the task of larger wheels and tires especially with spacers.

Interesting. For now I'm just going to tighten them up. Is 55/75 FP good for the spacers too?

**'68OrangeSunshine** · 01-17-2023, 04:05 PM

I'm running 235/75/16 Cooper Discoverer AS T3 tires.

**kwmech** · 01-17-2023, 04:45 PM

Quote:

Originally Posted by '68OrangeSunshine

Interesting. For now I'm just going to tighten them up. Is 55/75 FP good for the spacers too?

I would hope so.

**'68OrangeSunshine** · 01-17-2023, 04:59 PM

Quote:

Originally Posted by kwmech

I would hope so.

OK. Thanks

jimijam00 · 01-17-2023, 06:01 PM

Quote:

Originally Posted by kwmech

there is always this

or this

**'68OrangeSunshine** · 01-17-2023, 07:47 PM

Quote:

Originally Posted by jimijam00

or this

What year is that chart for?

**Palf70Step** · 01-18-2023, 08:14 AM

Chart is 1972, but the 1970 manual has same information, it is just written as paragraph instead of a chart.

**'68OrangeSunshine** · 01-18-2023, 11:29 AM

Great. Thanks.

01-17-2023, 02:03 PM	#1
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Lug Nut Torque What's the proper torque setting for 7/16'' lug nuts on a '71 GMC Jimmy? __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

01-17-2023, 02:15 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	Re: Lug Nut Torque I take 'em to 80.............1/2'' I take to 95......... and 9/16 I torque to 110

01-17-2023, 02:17 PM	#3
jimijam00 Registered User Join Date: Apr 2009 Location: PNW Posts: 553	Re: Lug Nut Torque 70-90?

01-17-2023, 02:18 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	Re: Lug Nut Torque there is always this Attached Images

01-17-2023, 03:36 PM	#5
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: Lug Nut Torque Thanks Guys. I consider it a K/10. GMC calls the Jimmy a K/1500. If the truck were a Chevy, it would be a K/5, but GMC never called them K/750s. Using KWMech's chart from the C+O/H Manual, I'll take them to 55 Ft/Lbs, then up to 75 Ft/Lbs. I'm running aluminum wheel spacers [1-1/4''] to accommodate some aluminum wheels off a '99 Suburban that have 0 backspacing. I was running on the freeway, about 60-65 MPH, when I heard a clunking noise that increased with speed. I pulled over. Thinking it may be the plastic fan shroud getting loose and hitting the fan, I used some bailing wire to secure that. Got back on the road and the clanking/vibration came back. Running the motor at idle when stopped, there was no noise. (I had to get a tow home. About 35 miles -- Hagerty is great.) So unless it's the transmission [SM465], transfer case [NP205], prop shafts or Universal joints, it could be the spacers wotking loose. They were installed in July, in AZ summer heat. Now it's cold. [Relatively]. Things were fine before the tire and wheel swap. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

01-17-2023, 03:42 PM	#6
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	Re: Lug Nut Torque With the spacers you should consider changing out the wheel studs for 1/2'' I do this conversion all the time. The 7/16'' studs are not really up to the task of larger wheels and tires especially with spacers.

01-17-2023, 04:05 PM	#8
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: Lug Nut Torque I'm running 235/75/16 Cooper Discoverer AS T3 tires. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

01-18-2023, 08:14 AM	#13
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: Lug Nut Torque Chart is 1972, but the 1970 manual has same information, it is just written as paragraph instead of a chart. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

01-18-2023, 11:29 AM	#14
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: Lug Nut Torque Great. Thanks. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

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