4 Speed Tranny ID

Information on the identification and numbering of frame, motor belly, transmission and other parts
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jank1331
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4 Speed Tranny ID

#1

Post by jank1331 » Tue Nov 08, 2011 4:37 pm

So, Am I readin this right? Jan1960? Wht does the 21 35 and 1E code mean? Thanks for the info.

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George Greer
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Re: 4 Speed Tranny ID

#2

Post by George Greer » Tue Nov 08, 2011 4:53 pm

Jank, see if this helps ya. After the replys to this thread, I got this transmission and it's now setting on the frame.

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George

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Re: 4 Speed Tranny ID

#3

Post by Speeding Big Twin » Wed Nov 09, 2011 5:27 pm

Yes you are reading it right and that date code means the case was cast in January 1960. Number 121 35 is one of at least three casting numbers found on Panhead trans cases. I think the last two characters indicate 1935 was either the first year of that casting number or otherwise it was the first year that casting number appeared on a bike, meaning similar cases may have first been cast in 1934. Anyway, that casting number may have made its first appearance on the 1935 Knuckleheads that were prototypes for the 1936 Knuckles.

The casting itself saw some changes over the years but the casting number remained the same for a long time and can be found on Panhead cases cast as late as early-1963. But it seems that at some stage around later-1963 the casting number changed to 34703 64 and the casting was slightly different, although the case was still used with a tin inner primary cover. Then not long after that the number changed again, becoming 34703 65, but that was partly due to the addition of the ears on the left side of the case which accommodated the aluminium inner primary cover for 1965 models.

The meaning of 1E is unknown to me and sometimes you’ll instead find 2E in that same area. Other cases have no E and just have either 1 or 2 but their meaning also eludes me at this point. Eric

jank1331
Posts: 42
Joined: Sun Sep 12, 2010 2:53 am
Bikes: 1958 FLH
Location: California

Re: 4 Speed Tranny ID

#4

Post by jank1331 » Thu Nov 10, 2011 1:57 am

Thanks for the reply Eric, This helps.
Steve

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