20 Tooth Mainshaft Clutch Gear

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20 Tooth Mainshaft Clutch Gear

Postby JerrryR » Sun Dec 15, 2019 7:46 pm

Hi All,
Recently I've been examine K and Sportster transmissions 52-69 in order to produce an OSKRG Bulletin on identifying the different versions of the gears, countershafts and mainshafts. While sorting through what I have I ran into a mainshaft clutch gear that is a puzzler. It has 20 teeth. The PBs call for 18 teeth, 52 and 53, and 17 teeth from that point on? My brother said maybe it's a racing application? Any insights would be appreciated. I noticed something else while examining the K trap door with the 20 tooth clutch gear, as can be seen in one of the pictures that follow there was not a countershaft oilier plug. Instead there is a little cover that fits down into the trap door recess and shields the countershaft bearing. My fingers are pointing at what is there and what the PBs say should be there. It has inscribed on it "Torrington" and some patent information. The only part that I could find in the PBs from 54 on is the oilier plug? Any help with understanding the 20 tooth clutch gear would be appreciated.

20T 1.3.jpg
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20T 2.2.jpg
20T 2.2.jpg (32.42 KiB) Viewed 6866 times
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Re: 20 Tooth Mainshaft Clutch Gear

Postby EKHKHK56 » Mon Dec 16, 2019 1:00 am

Hi Jerry! Ok someone put a Covered Bearing in place of Open Bearing. The end cap catches oil so that hole goes 12:00 and it feeds bearing. Hard to get oil past that cover! :o 35961-52 is the correct open style. 36960-52 or -54 is the Countershaft Right Covered Bearing. The 20 tooth Clutch Gear is #37450-56R and is in the Std Close Ratio Set and Special Close Ratio "D" Gear set for KR and XLRTT applications. The Countershaft Gear was 25 Teeth. Erik
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Re: 20 Tooth Mainshaft Clutch Gear

Postby JerrryR » Mon Dec 16, 2019 10:54 am

Thanks for the feedback Erik, one mystery solved, one more to go. The following picture shows another clutch gear. This clutch gear has 18 teeth which the PBs indicate were used in 52 & 53. My confusion arises because it has the oil seal extension PN 37538-56 that started in 56 from VIN 1465 and on. Does this mean this clutch gear with 18 teeth was used after 56 or would this oil seal extension have been compatible with the 52-53 clutch set up?
JerryR

18T, 2.1.jpg
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37538-56, 2.jpg
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37538-56, 3.jpg
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Re: 20 Tooth Mainshaft Clutch Gear

Postby Noot » Mon Dec 16, 2019 4:41 pm

The 18T is a C-Ratio Clutch gear - I need one too...wanna sell it? Thanks -Noot PS(I have the mainshaft gear to go with it) :)
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Re: 20 Tooth Mainshaft Clutch Gear

Postby EKHKHK56 » Mon Dec 16, 2019 5:24 pm

KR XLRTT C ratio chart
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