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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | Does anyone have the specs on the transmission floor cover plate screws for 1947-55? ...I have a 51 Chev.
thanks!
Last edited by BLUEMEANIE; 03/15/2011 8:27 PM.
| | | | | Joined: Oct 2010 Posts: 111 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 111 | | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | They would have been a clutch head sheet metal screw, I believe a #12. Let me correct that they are #14 clutch head sheet metal screw not #12. Here is a picture of the clutch head screws out of my '54 transmission cover. http://www.pbase.com/dennygraham/image/133229131/large Denny Graham Sandwich, IL
Last edited by Denny Graham; 03/17/2011 2:49 PM.
Denny G
Sandwich, IL
| | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | Cool. I'll check both. This gives me a place to start.
| | | | | Joined: Oct 2010 Posts: 111 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 111 | Maybe my '48 is different then others. Just double checked...My originals were 1/4-20 slotted screws, replaced the ones I could get out with SS 1/4-20. | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | Just bought some 1/4-20 x1/2 (lowes was outta the #12's) and they didn't fit the threads ... its dark tho and there's a couple decades worth of grime on the floor. I'll give it another shot in the AM. | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | 1/4 x 20 is a bolt ("machine-screw") thread. Try a #12 or #14 sheet metal screw as suggested by Denny. I'll measure mine tomorrow. | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | See the correction that I made to the earlier reply, it's a #14 not #12 clutch head SM screw. My 1950 uses the same size screws. The '50 is an oval head and the '54 is a flat head, both of them clutch drive. http://www.pbase.com/dennygraham/image/133229131/large http://www.pbase.com/dennygraham/image/133229284/large I've never seen a nut plate in the floor board which would be required to have a 1/4-20 cap or machine screw. DG
Last edited by Denny Graham; 03/17/2011 3:18 PM.
Denny G
Sandwich, IL
| | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | Cool. Thanks guys! I'll swap what I bought as soon as I get home tonight. | | |
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