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#1 |
Registered User
Join Date: May 2018
Location: Illinois
Posts: 40
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Stringing up the frame
Before I send the frame out I want to string it up to check squareness. At 1 time I found a post for what dimensions to check but it’s lost to me.
On another note, Anyone happen to have a measurement for the rear frame rail height? I am Installing the rear frame crossmember and ran into the issue below. The crossmember is sitting on the bottom rail. Doesn’t appear that way because of the perspective. ![]() Thanks for the help. Last edited by Lord_glum; 03-19-2019 at 08:29 PM. |
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#2 |
Senior Member
![]() ![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,385
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Re: Stringing up the frame
Rear frame rail height is 4.1/10" OD.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#3 |
Registered User
Join Date: May 2018
Location: Illinois
Posts: 40
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Re: Stringing up the frame
I should clarify it’s a 68 shortbed.
My frame measures: 3 7/8 id inside rail 4 3/16 od top to bottom of the outside. |
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#4 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Stringing up the frame
this should help
__________________
![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#5 |
Registered User
Join Date: Jul 2016
Location: Elkhart, Indiana
Posts: 292
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Re: Stringing up the frame
Just a word of advise, when trying to find square. GM's measurements are very, lets say "loose". Don't be surprised if the frame is 1/2-3/4" out of square. Also, check with a body shop that has a frame machine to see what the collision safe measurements are. Last frame I cut down a frame, the frame to start with was 9/16" out of square but that was okay according to specs from a body shop.
__________________
1967 Chevy C20 to K20 Conversion "Simply Toxic" http://67-72chevytrucks.com/vboard/s...d.php?t=749409 1971 Chevy C20 Custom Camper LS Swap http://67-72chevytrucks.com/vboard/s...d.php?t=763775 |
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#6 |
Registered User
Join Date: May 2018
Location: Illinois
Posts: 40
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Re: Stringing up the frame
Thank you all for the help and information. I will use this later this week when I hope to have this completed.
I also found I was shipped the wrong crossmember and the new 1 is in the mail. Thanks for the help. |
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