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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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| | | | Joined: Jun 2009 Posts: 98 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 98 | Have a leaking seal on the pto 15/16" OD. outshaft but I have to ID the pto gearbox to find the seal first. Transmission is a SM-420 with a 6 bolt aluminum case pto box. Numbers stamped into it are 204489 and C 393171 No manufacturers name anywhere and I couldnt find an answer in the archives soo... Any ideas on the manufacturer? Or other methods of IDing it?
Thankyou, John Drabik | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | It is likely an old Chelsea if it's aluminum but that really doesn't matter. If you pick the seal our of the case you will then be able to match it up dimensionally. | | | | | Joined: Jan 2010 Posts: 37 New Guy | | New Guy Joined: Jan 2010 Posts: 37 | I have an old PTO for my coe, the local 6-states driveline was able to ID the pto I had and even had the seals I needed in stock to finish the PTO rebuild. | | | | | Joined: Jun 2009 Posts: 98 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 98 | Matched up a seal for it yesterday. The original was a one piece affair with the seal and three bolt flange molded as one.
I melted the old rubber out of the flange and found a seal at a local shop that fit. RTV`d it into the flange installed it and have seen any drips so I guess its a success.
Thankyou, John Drabik | | |
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