47-55.1 Bed mount holes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nima · 08-16-2021, 10:20 PM

Hi:
Can somebody tell me, picture would be great, where is the last (or I should say which one is) bed mount hole on my 1953 long bed 3/4 ton GMC? I have taken everything down to the frame and I am working on possible 4 link rear end and I need the hole per instruction as reference point. From the end frame toward the front, I see 3 holes, two bigger ones and one smaller one in the middle.
Thanks

**mr48chev** · 08-17-2021, 03:09 AM

The only holes in the top of the frame rails behind the crossmember that runs under the back of the cab should be the holes for the bed hold down bolts.

The Mar-K instructions give some measurements but not a lot.
https://www.mar-k.com/PDFs/Instructi...-Long-Step.pdf

Nima · 08-20-2021, 12:45 AM

In this picture, I assume the first hole from the end of the frame rail is the last bed mount hole?
Thanks

**mr48chev** · 08-20-2021, 11:03 AM

I would have to believe that you are correct.

08-16-2021, 10:20 PM	#1
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Bed mount holes Hi: Can somebody tell me, picture would be great, where is the last (or I should say which one is) bed mount hole on my 1953 long bed 3/4 ton GMC? I have taken everything down to the frame and I am working on possible 4 link rear end and I need the hole per instruction as reference point. From the end frame toward the front, I see 3 holes, two bigger ones and one smaller one in the middle. Thanks __________________ 1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner

08-17-2021, 03:09 AM	#2
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,711	Re: Bed mount holes The only holes in the top of the frame rails behind the crossmember that runs under the back of the cab should be the holes for the bed hold down bolts. The Mar-K instructions give some measurements but not a lot. https://www.mar-k.com/PDFs/Instructi...-Long-Step.pdf __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.

08-20-2021, 12:45 AM	#3
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Re: Bed mount holes In this picture, I assume the first hole from the end of the frame rail is the last bed mount hole? Thanks Attached Images __________________ 1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner

08-20-2021, 11:03 AM	#4
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,711	Re: Bed mount holes I would have to believe that you are correct. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.



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