Looking for Lug torque specs for 92-99 suburban 2wd ( larger wheels 20s )

[A97obs]

Im trying to go by either what’s stated on this wheel and tire chart guidline that came with the wheels when shipped .. which seems crazy low for torque specs on a 20” wheel with 33s per the
(spec sheet) that came with the wheels , but I think it’s just a generic chart . Don’t think it pertains to Moto metal wheels.
So basically I’m open to listen to what others generally torque over sized wheels tires on these 88-98 c/k trucks or 2wd 92-98 SUV to be specific. I don’t wanna over load the cast wheels with to much lug torque, but then again there may be a diff rule of thumb on less or more lug torque with a larger wheel /tire .
What I can say is I have 33x12.50r20s
On a c1500 6” lift . Moto wheels ..

I have them at 120 ftlbs at the moment but haven’t driven a mile on them .
What’s weird is this chart states 14mm lugs are 85-95 Ftlbs

I’ve always ran a stock 15” c1500 wheel at 100 Ftlbs , any advice would be good to know for safe specs in my scenario.

Here’s the chart shipped with the rims
And another forum post I found for specs on diff year span c/k

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[someotherguy]

The torque isn't dictated by wheel size. I would stick to the factory spec of 140lb-ft***. The OEM aluminum wheels are cast, too.

BTW that spec is for all C/K trucks 1500-2500-3500. The exception are 3500HD's (the real HD's w/19.5" wheels) which are spec'd to 175lb-ft, because they have 5/8" wheel studs instead of 14mm.

***edited from incorrect 120lb-ft figure specified by 1992 manual. More info below..

Richard

 

[PM18S4]

99 suburban's torque spec for the tire lugs is a bit annoying to state.
The 1999 service manual, Pg. 3-111, lists a torque of 125 [ft-lb] (175 [N-m]).
However the 1999 Suburban owners manual, Pg. 6-67, lists a torque of 140 [lb-ft] (190 [N-m])
As there are known to be errors in the service manual, I tend to side with the owner's manual and torque to 50, then 100, then finally 140 [ft-lb] in the star pattern listed on Owner's Manual Pg. 5-30.

 

[someotherguy]

99 suburban's torque spec for the tire lugs is a bit annoying to state.
The 1999 service manual, Pg. 3-111, lists a torque of 125 [ft-lb] (175 [N-m]).
However the 1999 Suburban owners manual, Pg. 6-67, lists a torque of 140 [lb-ft] (190 [N-m])
As there are known to be errors in the service manual, I tend to side with the owner's manual and torque to 50, then 100, then finally 140 [ft-lb] in the star pattern listed on Owner's Manual Pg. 5-30.

I'll have to check my later manuals and see what they say. The 1992 C/K owner's manual says 120 for everything except the HD.

Just because it's right here beside me, I checked the 2006 Silverado manual - apples to oranges but it should still apply as they use 14mm wheel studs as well, and it shows 140lb-ft.

Edit - yeah, looks like over the years, GM eventually revised it to 140 for all (except the HD of course, 175 across the board for the 3500HD with 5/8" wheel studs)

1995 manual says 120 for all but 3500 duallies get 140
1996 manual says 140 for all
1998 manual says 140 for all

Richard

 

[SUBURBAN5]

X 2 on 140. That's what my manual says for my 98 suburban

 

[A97obs]

I guess I’m probably good at 120 I mean that’s a guess I’ knew it would be a here and there debate… lol doesn’t seem to be a very direct finding .. I to kept finding different answers.

120-140 Ftlbs ~ is it critical to be spot on with one value or the other ? Dunno? I could go 130 ftlbs and split it.

I know they aren’t coming loose within a 20 ftlb range difference…this was more so to steer clear of the horror story’s of a few cast Moto wheels that had shattered/ fell to pieces during a drive .. and the blame being placed on lug torque and or a bad batch of wheels with specifically Moto metals .
Frkn everyone and there Ma’ has them so I don’t know if such a scenario is a fluke but I def don’t wanna be apart of that due to a lug torque issue

 

[someotherguy]

Numbers from aftermarket sources are harder to trust than straight from GM.

Also those earlier truck and Suburban figures on that document are for squarebody trucks which used 1/2" wheel studs, considerably smaller than the 14mm on GMT400's. (The squarebody 3/4 ton stuff used 9/16" which are basically the same as 14mm of course.)

Richard