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Jul 21st, 2025 | | | | Joined: Jun 2016 Posts: 222 DLBrooks | | DLBrooks Joined: Jun 2016 Posts: 222 | This may be listed elsewhere and maybe no one cares but I disassembled a GM 1946 -- 4 speed crash box and have the following bearing list:
Input shaft to mainshaft pilot -- Open Roller cage - no number found - have not found- .875" ID x 1.25" ODx 1.5 " long ---- I need to clean up the mainshaft pilot so I will lathe it to .75" and hope to use a Koyo HJ-122016 open needle roller bearing. It has an outer case that may solve any female input shaft issues. .75"x1.25"x1" long
Input shaft bearing -- FAFNIR 209K
Rear Mainshaft --- New Departure 3307
Front Countershaft --- Hyatt ORB 1206
Rear Countershaft ---- Hyatt ORB 1207
Feel free to update or correct this list and add any cross references, etc.
Last edited by 42465967; 01/27/2018 6:02 PM. Reason: words
| | | | | Joined: Apr 2005 Posts: 7,442 Bolter | | Bolter Joined: Apr 2005 Posts: 7,442 | Thanks for posting this list, it will be helpful to some.ðŸ›
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
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USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Jun 2016 Posts: 222 DLBrooks | | DLBrooks Joined: Jun 2016 Posts: 222 | The fit of the Koyo is just a bit more than a slip fit into the input shaft... nice. Should be able to pull it easily with a pilot bushing puller. Again I will lathe the mainshaft pilot to .75". https://67-72chevytrucks.com/vboard/showthread.php?p=8172090#post8172090There are probably some of the originals nos open roller cage bearing out there. Has anyone removed the rear mainshaft bearing -- new departure 3307--- with a bearing seperator and not destroyed it? Or does the shaft snap ring push off with the bearing?
Last edited by 42465967; 01/29/2018 1:05 PM. Reason: words
| | | | | Joined: Jun 2016 Posts: 222 DLBrooks | | DLBrooks Joined: Jun 2016 Posts: 222 | Does anyone know if the crashbox 4 speed was left natural casting color from the factory or was it painted a color?
Gray?
If it was casting color I may clear coat it. | | |
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