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Jul 21st, 2025 | | | | Joined: Sep 2019 Posts: 204 'Bolter | | 'Bolter Joined: Sep 2019 Posts: 204 | Did the muncie 4 speed transmission come painted from the factory? Is so, what color. | | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | I've never found any paint on an SM-420, they have always been bare cast iron under the grease and oil. If I was restoring one I'd either paint it semi gloss black or cast iron gray. The gear shift lever (cane) would be black. Mike B  | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | oops - I deleted incorrect info - thanks for the "heads up", Mike.
I dimly recall that the SM420 was painted black on my 54/55 GMC Z-Series 350 COE (but, it might have been real dirty and it might have been a replacement transmission)?
Some oldGMCtrucks members indicated that replacement transmissions might have been a different color than an original-equipment SM420.
Sorry about my incorrect-information link.
Last edited by tclederman; 01/09/2021 6:52 PM. Reason: changed/deleted incorrect informationn
| | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | Tim, the OP was asking about transmission colors, not engine color... Mike B | | | | | Joined: Sep 2019 Posts: 204 'Bolter | | 'Bolter Joined: Sep 2019 Posts: 204 | Semi gloss black was what I was thinking. Thanks guys | | | | | Joined: Dec 2018 Posts: 2,451 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 2,451 | Chevy's till I die Dont think they painted those gear boxes like they said these trucks were for work not show !!! | | | | | Joined: Jul 2020 Posts: 112 'Bolter | | 'Bolter Joined: Jul 2020 Posts: 112 | As far as i know, the trans itself was not painted, the only part that was painted would have been the pto, red was one brand and black was another, muncie and chelsea i believe.
THE BLACK VIKING
1958 Viking 60 ~ my new toy hauler
My Current fleet: 1954 chevy 3800, 1953/4 gmc 450 coleman 4x4, 1956 chevy pickup, 1958 Viking 60
Keep 'em rollin fellas!
| | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | As far as i know, the trans itself was not painted, the only part that was painted would have been the pto, red was one brand and black was another, muncie and chelsea i believe. PTO's were aftermarket and installed by the dealer/owner for their intended use, so they have no bearing on what color the trans should be. Mike B | | | | | Joined: Dec 2020 Posts: 104 'Bolter | | 'Bolter Joined: Dec 2020 Posts: 104 | Our 1956 6400 4 speed does not appear to have been painted. I don't know if it is original, but guess that it is. The engine was probably a dealer replacement as it has no serial number, and January 1958 casting. Also, the block and head are unpainted, but oil pan, valve cover, and side cover are yellow.
Steve | | |
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