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mixed up muncie ID? #1330062 10/15/2019 11:30 PM
Joined: Aug 2019 Posts: 242 NM O Ott3r 'Bolter
Ott3r 'Bolter O Joined: Aug 2019 Posts: 242 NM	Trying to ID my SM420 transmission so I can buy new parts... the Novak-Guide says that '64-67 transmissions have a 7 digit casting number with aluminum 2nd gear synchro and identical 3rd & 4th synchros My transmission has a 7 digit casting code, however, the date code ends with a 9 (indicating 1959) The 3rd and 4th synchros appear to be identical, but my 2nd gear synchro cone & teeth appear to be steel rather than aluminum. So maybe the novak guide is wrong & they actually used 7 digits in 1959? Or maybe I have a '64-67 transmission where they screwed up the date code? Doesn't seem like my 3rd and 4th synchros should be identical if there are steel parts for 2nd gear synchro rather than aluminum? What is happening here? '59 Chevy Suburban, NAPCO

Re: mixed up muncie ID? Ott3r #1330067 10/16/2019 12:19 AM
Joined: Jan 2013 Posts: 1,518 Gig Harbor, WA S sstock 'Bolter
sstock 'Bolter S Joined: Jan 2013 Posts: 1,518 Gig Harbor, WA	Ott, they are talking about the friction material (aluminum vs steel) that is housed within the first gear. This is what is used to slow the 2 nd gear syncro ring. I have only ever seen one that was worn enough that warranted replacement out of a dozen or so transmissions that I have worked on this last year. As far as I know the friction material is unavailable by itself necessitating replacing the entire first gear if needed. Steve Attachments firstgear1.jpg (206.18 KB, 68 downloads) Last edited by sstock; 10/16/2019 12:28 AM. 1953 Chevrolet 3100 261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done In the DITY Gallery Video of the 261 running 1964 GMC 1000 305 Big Block V6, sm420, the next cab off restoration

Re: mixed up muncie ID? sstock #1330069 10/16/2019 12:31 AM
Joined: Aug 2019 Posts: 242 NM O Ott3r 'Bolter
Ott3r 'Bolter O Joined: Aug 2019 Posts: 242 NM	Whoa, you work on a lot of transmissions! Thanks for the distinction... mine does shift nicely into 2nd and the friction material (within 1st gear) is bronze. I'm mainly needing to replace the 3rd gear synchro and am debating to do the bearings while i'm at it. Present bearings 'seem' ok and are labeled 'New Departure' made in USA Logan Last edited by Ott3r; 10/16/2019 12:33 AM. '59 Chevy Suburban, NAPCO

Re: mixed up muncie ID? Ott3r #1330093 10/16/2019 2:28 AM
Joined: Jan 2013 Posts: 1,518 Gig Harbor, WA S sstock 'Bolter
sstock 'Bolter S Joined: Jan 2013 Posts: 1,518 Gig Harbor, WA	Yes excuse my typo, most are bronze. To replace the 3rd synchro you will need to remove the clutch gear and press the rear bearing off the main shaft to get the gear cluster out of the case. The hub will need to be pressed off the main shaft to get to the 3rd synchro. Occasionally they pop up on ebay. There is one in there now https://www.ebay.com/itm/1948-1949-1950-1955-chevrolet-4-spd-truck-1st-gear-countergear-nos-gm-591602/123819292750?hash=item1cd434784e:g:PRwAAOSwV4xcu31W cheap enough Last edited by sstock; 10/16/2019 2:32 AM. 1953 Chevrolet 3100 261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done In the DITY Gallery Video of the 261 running 1964 GMC 1000 305 Big Block V6, sm420, the next cab off restoration

Re: mixed up muncie ID? Ott3r #1330150 10/16/2019 5:39 PM
Joined: Sep 2009 Posts: 296 Lee's Summit Missouri (Kansas ... G Green_98 'Bolter
Green_98 'Bolter G Joined: Sep 2009 Posts: 296 Lee's Summit Missouri (Kansas ...	Anyone have a 4-speed yoke for 1/2 ton torque tube? I need one for my Muncie 420. -Patrick 1953 Chevrolet 3100 261 / 4-speed / 4:11 / Commercial Red

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