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#77464 05/11/2007 4:08 PM | Joined: Nov 2006 Posts: 33 New Guy | | New Guy Joined: Nov 2006 Posts: 33 | Hello
I am looking for internal parts for a 4 speed trans in my 1949 3100. Trans is good shape but need 3/4 syncronizer. It grinds if I shift it to fast. If I shift it slow or double clutch it's ok. Does anyone know the trans model???
Thanks
Bill
TIGHT IS TIGHT,TOO TIGHT IS BUSTED
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#77465 05/11/2007 4:12 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Bill, I'm going to guess that your transmission is a SM-420 and that parts are readily available. I have enclosed a link to a outfit that has good info and it appears all the parts you would need for a rebuild. Good luck!  http://www.novak-adapt.com/catalog/sm420_parts.htm Stuart | | |
#77466 05/11/2007 4:14 PM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | That would be the SM420. Check over on the Links page, there's a couple of sites with info on that tranny. And if you don't have a shop manual, check out the Online Chevy Manual site. I think that there is a '49 manual on there, if not, any of the later manuals would have info on the trans as well, as it was used up to '66.
I can relate to the syncro problem you're having. A guy I ran around with in my youth had a '49 1 ton 4 speed. It did the same thing.
Bill Burmeister
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#77467 05/11/2007 8:49 PM | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | The Novak site that Bill gave is a good place to look. Also there has been alot of talk about the SM420 in the Bigbolts. | | |
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