Shifter cam shaft differences

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panhead_kicker
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Shifter cam shaft differences

#1

Post by panhead_kicker » Sat Feb 26, 2011 7:28 pm

I am reading Palmer's book trying to determine what Shifter cam shaft I have come across. He states the handshift shaft and footshift shafts both are 3/8" in diameter and 4 15/16" long, with a double groove to the right , and a single groove to the left end. If so , then how are they different?
He states that the footshift 52-79 shaft is #34031-41 and the handshift 36-76 shaft is #34030-36. Can the earlier shaft be used in a foot shift cover?



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Re: Shifter cam shaft differences

#2

Post by Robert Luland » Sat Feb 26, 2011 9:02 pm

Hand shifter drums are a solid drum with a gear at one end. On the opposite end it will have indentations for the selector ball bearing to drop into. Foot shift or ratchet top will look the same but instead of notches it has a disk at the end that almost looks like a clover for the selector dog to drop into. The two slots on a four speed drum are a reverse mirror image of one another. I can’t tell you what a three speed with reverse looks like because I’ve never seen one. Bob L

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Re: Shifter cam shaft differences

#3

Post by panhead_kicker » Sat Feb 26, 2011 10:35 pm

Robert Luland wrote:Hand shifter drums
Thanks Bob, I think I've got the drum down, but what I was asking about was the shafts the drum rotates on.

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Re: Shifter cam shaft differences

#4

Post by Robert Luland » Sun Feb 27, 2011 12:04 am

Sorry about that. The shafts are not interchangable. I think one is longer than the other. I will measure them in the morning when I get into the shop to play. Bob

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Re: Shifter cam shaft differences

#5

Post by Robert Luland » Sun Feb 27, 2011 2:42 pm

Good morning! You'll have to accept my apologies. I can only find two 34031-41 in stock which are ratchet top. They measure 4.720 in length. I know I got the 34030-36 around here somewhere, but? The only difference I can remember is length. bob L

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Re: Shifter cam shaft differences

#6

Post by Bosheff » Sun Feb 27, 2011 3:38 pm

I might be mistaken, but I believe the -41 part number is also common to a 45 tranny....bosheff

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Re: Shifter cam shaft differences

#7

Post by panhead_kicker » Sun Feb 27, 2011 5:30 pm

Bosheff wrote:... I believe the -41 part number is also common to a 45 tranny....bosheff
Bosheff,
Yes according to Palmer that is correct.
Robert Luland wrote:...I can only find two 34031-41 in stock which are ratchet top. They measure 4.720 in length. I know I got the 34030-36 around here somewhere, but? The only difference I can remember is length. bob L
Bob,
The shaft I have is 4-15/16, and (seems to me) fits correctly in a footshift cover. By correctly, I mean that the narrow groove is just visibly protruding out the one side of the casting, and the large groove is not quite centered down in the set screw hole, but almost and certainly enough for the set screw. It's looking like a duck to me.

Any possibility the two shafts you measured could actually be the handshift 34030-36? I don't see how one less than 4 3/4s could work in this footshift cover.
DSCN6010.JPG
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Re: Shifter cam shaft differences

#8

Post by Robert Luland » Sun Feb 27, 2011 7:37 pm

Thats the foot shifter shaft. The other one I measured this morning was a hair longer but who knows what happen in Milwaukie on Monday mornings. It don't get better than this. Bob
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Re: Shifter cam shaft differences

#9

Post by RUBONE » Sun Feb 27, 2011 8:19 pm

I just removed one from a handshift top and it measured 4.978, I measured one from a 45 and it measured 5.085 or a difference of about .107. these were quick measurements with a dial caliper so could be off a couple thou either way.
The other difference I saw was that the HS one has a narrow groove outside of the o-ring groove, only about a 16th. The 45 & FS one has a groove about .090 or more.
Robbie

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Re: Shifter cam shaft differences

#10

Post by panhead_kicker » Sun Feb 27, 2011 9:25 pm

Thanks Bob and Robbie,
I see now that I have the handshift shaft, which has 3 grooves in it Vs. 2 for the foot shift shaft.
Looks like another edit for Mr. Palmer if another edition is ever released. Having said that, I don't see a reason why the handshift shaft could not service well in the footshift cover. Both necessary grooves are there, in the right location. The thin third groove isn't needed to extract the shaft in the fs cover, but certainly wouldn't hurt anything being there. Anyone see why not?

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Re: Shifter cam shaft differences

#11

Post by Robert Luland » Sun Feb 27, 2011 9:36 pm

I remember one other thing about the hand shift shaft. It hangs out side of the cover by about 3/16 to a ¼ of an inch. The last one I disassembled and I put that tit in the vise and worked the top back and forth to get it out. It didn’t work so I drilled a 1/16” hole at the other end and used a drift to drive it out. No matter which one you have , I wish you all the luck in the world in getting that square o ring into the hole. Bob

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Re: Shifter cam shaft differences

#12

Post by Robert Luland » Mon Feb 28, 2011 10:24 pm

Observe the shaft extension sticking out on the hand shifter model in the picture. This is there because it's the only way to get it out without drilling a hole at the other end. The ratchet top doesn't have this problem since a hole can be drill at the other end (If it's not there all ready) and is covered by the gear shifter adaptor plate. Bob L
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Re: Shifter cam shaft differences

#13

Post by ncitta » Mon Feb 28, 2011 10:29 pm

Robert, where did you find those covers for the oil line fittings??
Regards, Nelson

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Re: Shifter cam shaft differences

#14

Post by Kuda » Tue Mar 01, 2011 2:36 pm

ncitta wrote:Robert, where did you find those covers for the oil line fittings??
Regards, Nelson
Not Robert, but I got mine from Colony. They came in a pack of 5, one for every nipple/fitting.

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Re: Shifter cam shaft differences

#15

Post by ncitta » Tue Mar 01, 2011 10:07 pm

Thanks!!

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