Need help identifying these - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dwjet2 · 06-25-2025, 02:52 PM

I am doing a frame off resto of my 72 C20. I had the frame sand blasted and then I painted it. Once I lifted the cab to put it back on the frame I found these under the cab and have no idea where they go or if they even go to it.

Any ideas guys?

thanks

**PbFut** · 06-25-2025, 05:38 PM

Exhaust Hangers ??

**Orefactory4x4 swb** · 06-25-2025, 05:51 PM

Quote:

Originally Posted by PbFut

Exhaust Hangers ??

That would be my first guess too.
Or some kind of step hardware.
Didn’t see them on my build, curious though.

**jaros44sr** · 06-25-2025, 07:35 PM

Under side of body for seat reinforcements………….thinking

Depends on dimensions?

dwjet2 · 06-25-2025, 07:46 PM

I will look at the possibility of them being exhaust hangers. Truck never had any steps on so that is out. I replaced the bench seat years ago for buckets out of a 2000ish Silverado so I don't think it is that. I have looked though the service manual and all over LMC's website and cant figure it out. Maybe they do not even go to my truck, it has taken 5 years from tear down to get to this point

**kwmech** · 06-26-2025, 10:50 AM

Frame reinforcement inside the frame channel for the big block mounts, right and left side. For sale ??

Classic Bowties · 07-03-2025, 06:22 PM

Quote:

Originally Posted by dwjet2

I am doing a frame off resto of my 72 C20. I had the frame sand blasted and then I painted it. Once I lifted the cab to put it back on the frame I found these under the cab and have no idea where they go or if they even go to it. Any ideas guys?

Quote:

Originally Posted by kwmech

Frame reinforcement inside the frame channel for the big block mounts, right and left side. For sale ??

^ ^ ^ dwjet2, we missed this one when you originally posted but here are a few of our old saved folder pics to go with kwmech's above post, your brackets in question are the OE front frame to x-member doubler braces that were used/found on the 2wd 72 C/20-30 trucks. The first pic shows where and how they were mounted to the inner sides of the forward frame rails, there is one LH/RH specific inner brace and one lower flat plate per reinforcement setup, we do have a few of these 4 pc. OE frame brace setups pulled/ready to ship if anyone needs a set. Mel

.

RichardJ · 07-03-2025, 08:44 PM

These were on a '76 C30 with big block. I was originally going to use the '76 crossmember on my '67, but ended up putting the '67 back in because the forged ears on the crossmember looked stronger. I thought why not use these as well and only had to redrill the top hole.

dwjet2 · 07-03-2025, 09:24 PM

Awesome guys thank you I can move forward with those now

**70STOVEBOLT** · 07-07-2025, 01:45 PM

Are these really necessary? I see Mel posted the application being C/K20 & 30. What about the C/K10?

06-25-2025, 02:52 PM	#1
dwjet2 Registered User Join Date: Dec 2011 Location: phx,Az Posts: 3	Need help identifying these I am doing a frame off resto of my 72 C20. I had the frame sand blasted and then I painted it. Once I lifted the cab to put it back on the frame I found these under the cab and have no idea where they go or if they even go to it. Any ideas guys? thanks Attached Images

06-25-2025, 05:38 PM	#2
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 1,026	Re: Need help identifying these Exhaust Hangers ??

06-25-2025, 07:35 PM	#4
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,950	Re: Need help identifying these Under side of body for seat reinforcements………….thinking Depends on dimensions? __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

06-25-2025, 07:46 PM	#5
dwjet2 Registered User Join Date: Dec 2011 Location: phx,Az Posts: 3	Re: Need help identifying these I will look at the possibility of them being exhaust hangers. Truck never had any steps on so that is out. I replaced the bench seat years ago for buckets out of a 2000ish Silverado so I don't think it is that. I have looked though the service manual and all over LMC's website and cant figure it out. Maybe they do not even go to my truck, it has taken 5 years from tear down to get to this point

06-26-2025, 10:50 AM	#6
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,944	Re: Need help identifying these Frame reinforcement inside the frame channel for the big block mounts, right and left side. For sale ??

07-03-2025, 08:44 PM	#8
RichardJ Registered User Join Date: Apr 2010 Location: So Cal Posts: 1,557	Re: Need help identifying these These were on a '76 C30 with big block. I was originally going to use the '76 crossmember on my '67, but ended up putting the '67 back in because the forged ears on the crossmember looked stronger. I thought why not use these as well and only had to redrill the top hole. Attached Images __________________ '67 GMC 2500, 292, 4spd, AC

07-03-2025, 09:24 PM	#9
dwjet2 Registered User Join Date: Dec 2011 Location: phx,Az Posts: 3	Re: Need help identifying these Awesome guys thank you I can move forward with those now

07-07-2025, 01:45 PM	#10
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 7,066	Re: Need help identifying these Are these really necessary? I see Mel posted the application being C/K20 & 30. What about the C/K10? __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear



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