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| | | | Joined: Jul 2021 Posts: 27 'Bolter | | 'Bolter Joined: Jul 2021 Posts: 27 | I was rebuilding the rear mounts for1951 3100 cab.
I was checking to see if Grade 5 bolts are okay to use.
Also does anyone know the length of the bolts used on the rear cab mounts the old ones are gone. | | | | | Joined: Sep 2009 Posts: 5,980 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,980 | Miller - The 1947-54 FAM says those bolts securing the rear cab mount to the frame and cab floor brace are common hex head bolts, GM# 120233. From what I could track down, the dimensions for those bolts are 7/16-14 x1 1/8" bolts and should be accompanied with 7/16" split lock washers. I couldn't find a designated bolt grade, but think at a minimum a Grade 5 is needed. Just to be on the safe side a Grade 8 wouldn't hurt. Hope this is helpful. 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Aug 2019 Posts: 251 'Bolter | | 'Bolter Joined: Aug 2019 Posts: 251 | I added seat/lap belts in my 57 3200 and grade 8 were required. It would seem silly to attach a grade 8 seatbelt to a grade 5 cab! 
1957 Chevy 3200Daily DriverPS, A/C, Tilt column, Rebuilt 350, Rebuilt TH350, Reupholstered Bench Seat, sound proof/insulated, LED headlights/taillights/backup lights/interior courtesy lights. Follow in the DITY | | | | | Joined: Jul 2021 Posts: 27 'Bolter | | 'Bolter Joined: Jul 2021 Posts: 27 | Thanks for the info after looking at the 7/16 -14 were to big had to go with 3/8-16 to fit right. | | | | | Joined: Mar 2010 Posts: 10,298 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,298 | Which bolts are you referring to? The ones which go through the rubber or the ones which go through the frame?
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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