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Click on image for the lowdown. 
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| | | Forums66 Topics128,080 Posts1,055,956 Members48,430 | | Most Online14,466 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
old truck web site
on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Jul 2005 Posts: 1,158 Shop Shark | | Shop Shark Joined: Jul 2005 Posts: 1,158 | IIRC, the 40 has the same dash as my 46 does.
There are three screws on the back side of the dash that holds the speedometer onto the back of the cluster. Pull those screws and the cable, and you should be good to go.
My 46 is leaky, too. I am going to have to drain the transmission and pull the rear off of my transmission anyway to fix the speedometer drive unit, so I just figured that I'd replace seals and gaskets then. | | |
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