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05-16-2015, 10:35 PM
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#1 |
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Registered User
Join Date: Feb 2014
Location: Urbana Illinois
Posts: 55
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cross member bolts
Anybody know the correct size of the cross member bolts that attach across the frame....the one that supports the transmission. I want to replace the ones that attach to the frame. My truck is a 1978 C10 Custom Deluxe. Thank you, Al
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05-17-2015, 02:07 AM
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#2 |
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Registered User
Join Date: Feb 2015
Location: Santa Rosa, Ca.
Posts: 539
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Re: cross member bolts
My 77 has all 3/8ths bolts cross member to frame and lots of them. The only 7/16ths I know of are the rear mount bolts
__________________
1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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05-17-2015, 02:28 AM
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#3 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,624
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Re: cross member bolts
My 81 uses 3/8" x 1 1/4" bolts..at least 10 on each side...I think
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05-18-2015, 12:27 AM
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#4 |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,472
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Re: cross member bolts
Even if you know the hex head size, you won't know the length w/o measuring.
BTW, a 11/16" or 5/8" hex head means the bolt is 7/16", probably NC (14 threads/inch). A 9/16" hex head means it's a 3/8" bolt, probably NC (16 threads/inch).
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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05-18-2015, 02:38 AM
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#5 |
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Registered User
Join Date: Feb 2015
Location: Santa Rosa, Ca.
Posts: 539
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Re: cross member bolts
on mine they are 1 1/4 inch long. but changing the 4 on the top frame rail might prove unlikely. there's not enough clearance between cab and rail
__________________
1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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05-18-2015, 09:36 PM
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#6 |
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Registered User
Join Date: Feb 2014
Location: Urbana Illinois
Posts: 55
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Re: cross member bolts
Thank you all, Al
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