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#1 |
Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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LMC for cab-to-frame shims?
My shims were toast (all but 1 of them). Has anyone ordered cab-to-frame shims from LMC? How were those?
UPDATED. See post below. Last edited by In The Ten Ring; 04-29-2014 at 12:19 PM. |
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#2 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,270
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Re: LMC for cab-to-frame shims?
I would think it would be hard to mess up a body shim. Have you tried to see if they are still to be had from GM? I know I had a couple of drawers full for the then newer style truck[88-98] and still have a bunch but they are way big for that.
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#3 |
Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: LMC for cab-to-frame shims?
The two front shims are on a 12 week backorder! YIKES! (LMC)
Unless I can find a pair from someone on here, I am going to make my own....which means getting my dad to show me how to torch cut then shape them to size and drill the holes. I was able to order the rear shim. |
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#4 |
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Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: LMC for cab-to-frame shims?
For my own education: were there shims at every body mount location?
The reason I ask is because during the squarebody era ('73-87ish) we shimmed to fit; we only added a shim to a body mount location to help with fit and finish or to add preload to a specific mount. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#5 | |
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Join Date: Jun 2013
Location: West Virginia
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Re: LMC for cab-to-frame shims?
Quote:
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#6 |
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Join Date: Jun 2013
Location: West Virginia
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Re: LMC for cab-to-frame shims?
UPDATE!
I found a local machine shop (never knew he was there and I drive by there often) that can do all 3 shims for $18.00 and he will include the steel. I cancelled my LMC order. ![]() My dad's torch set is 30+ years old and it's rather hard to get to with all that junk in the garage. |
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#7 |
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![]() Join Date: Oct 2009
Location: Phoenix, AZ
Posts: 475
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Re: LMC for cab-to-frame shims?
Interesting thread. I just installed new rubber mounts from the Truck Shop, and found I needed to shim the rear mounts to get the cab properly aligned with the bed. However, the ride is definitely different - harsher - now than before. I don't know whether this is the shimming messing with the pre-load on the mounts, or just the difference between the old and new mounts. Any opinions?
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1971 C10 Longbed, 350/TH350 |
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#8 | |
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Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: LMC for cab-to-frame shims?
Quote:
![]() K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#9 | |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: LMC for cab-to-frame shims?
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#10 |
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Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Re: LMC for cab-to-frame shims?
I just made some shims to get mine where I wanted it to line up correctly. I think I remember I just had to do the rear ones also.
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#11 |
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Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: LMC for cab-to-frame shims?
WIDESIDE72 is on to something. I asked Wes over at Classic Heartbeat about it and he said that people overtighten their bushings, which negates the reason why we use bushings in the first place.
If I recall correctly, he advised to "tighten until the bottom washer touches the bushing then turn 1 more turn." |
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#12 |
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Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,270
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Re: LMC for cab-to-frame shims?
The shim should have been used by the General on a as needed basis and the new cab mount with a harsh ride quality could be from maybe a different rating of the plyability of the material. I know fro the hundreds of cabs and core supports that I've put on if you tighten the mount too tight it will fail sooner than it should because it will cause the rubber to bulge outward and that is where the failure will start. Now as far as the availibilty go to the lumber store or tractor store and buy some large washers if you are desperate and jack up and install them, not quite as good but just as effective. Jim
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#13 |
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Location: Phoenix, AZ
Posts: 475
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Re: LMC for cab-to-frame shims?
I torqued them to factory spec from the service manual. I forget what that is, and am out of town so I can't check.
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1971 C10 Longbed, 350/TH350 |
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#14 |
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Join Date: Jun 2006
Location: Lutz, Florida
Posts: 838
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Re: LMC for cab-to-frame shims?
I would like to know the torque specs too! Thanks!
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1967 Red, C10 Short Bed 6.0L T5 5 speed 1967 Orange and Black C50 6.2 Detroit Diesel NV4500, 2 Ton Pickup 1972 White, Chevy Blazer 2WD 67 Dog house 5.3 4L65 2016 Power Tour LH 1955 Red-Cream, Chevrolet Nomad, restoration on hold 2004 Black, Corvette Z06 LS6 convertible (Rock solid Fun) 2011/2018 Power Tour |
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#15 |
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Location: Phoenix, AZ
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Re: LMC for cab-to-frame shims?
Ill be home Saturday, and look it up if nobody gets there before me. But, the torque will not affect the bushing pre-load. You are tightening the bolts/nuts up against the spacers, and it it the length of the spacers relative to the thickness of the rubber mounts that determines the pre-load.
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1971 C10 Longbed, 350/TH350 |
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