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Mod | | | Forums66 Topics128,043 Posts1,055,610 Members48,426 | | 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!
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| | | | Joined: Dec 2013 Posts: 45 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 45 | Hi All, I have a 51 3800 with a 58 235ci motor and I don't know what the four speed is so I can replace the clutch. It does a pto on it. How do I decode the numbers on it? Thank you in advance, Gerry Lee | | | | | Joined: Sep 2010 Posts: 2,307 'Bolter | | 'Bolter Joined: Sep 2010 Posts: 2,307 | Go to the Novak site it is probably a Muncie sm 420 .if you search the numbers it should also tell the year but the Novak site shows the differences as well . | | | | | Joined: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | It's good to know what year/model transmission you have but that is not necessarily going to determine what clutch you need. It could possibly have a 10" or 11" clutch depending on which flywheel it has. The only way to get the correct clutch is to remove it and match it up or have it rebuilt.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Dec 2013 Posts: 45 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 45 | Thanks for your input. It is a sm420 but it has a 10 3/4" clutch and now to try and locate one! Thanks again, Gerry | | |
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