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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Jul 2013 Posts: 863 Shop Shark | | Shop Shark Joined: Jul 2013 Posts: 863 | Started to install these new grommets that I got from JC trucks on my 1949 3100 1/2 ton. The I.D. of the speedometer grommet is too large for the new metal speedo cable. I.D. looks to be 1/4" and the O.D. on the new metal cable is 3/16". The small wiring harness grommet at the firewall is too small for the hole in the firewall. It installs, but slides all around in the hole on the firewall. Is there any other suppliers that would have the correct size grommets?
Tim
"Pay attention to the details! It ALWAYS pays off."
1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle
| | | | | Joined: Apr 2014 Posts: 924 Shop Shark | | Shop Shark Joined: Apr 2014 Posts: 924 | You 'could' mix some 2-part epoxy up to fix that grommet's sliding around. The parts stores have assortments of grommets. There are also PCV valve fittings that would work, at the same parts stores. I'm sure you've seen them, but I am not omnipotent.
I've just made a few grommets cut from a 3/4" horse stall rubber mat from Tractor Supply Company. They are cut to the correct size, by me. I got tired of fooling with the parts stores' grommets, and the previously ordered grommets from vendors.
Brad
Wrench Fetcher, PhD | | | | | Joined: Sep 2015 Posts: 17 New Guy | | New Guy Joined: Sep 2015 Posts: 17 | I made mine up myself in-situ. I cut a thin slice off a mastic tube about the thickness of the grommet. cut it so it opens up around the mentioned grommet, kept to size with a cable tie, and kept in place with masking tape. Then fill with black mastic, smooth out and leave overnight. Remove the next day and you have a nice new grommet covering the old on without all the hassle.
Easy.
55 Chevy Stepside.
| | | | | Joined: Jun 2003 Posts: 565 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 565 |
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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