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727 yoke question
#557532
12/19/09 09:23 AM
12/19/09 09:23 AM
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Joined: Oct 2009
Posts: 92 south carolina U.S.
DOUGG
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i have a 65 727, which has a internal seal on the output shaft that the front yoke slides onto. i believe its purpose is to seal the yoke splines from tranny fluid. the factory method for lubing the yoke splines was to add multi-mileage grease to the inside of the yoke. the factory yoke had a small hole in the rear of yoke to allow pressure build-up inside the yoke to escape. after 66 the seal was eliminated and tranny fluid is allowed to lubricate the yoke splines. question-my yoke is the later version & doesnt have the vent hole.i know my yoke fits the seal good ,i have to lube the inside of yoke get it to slide onto the seal. at about a 10 mph roll on rough road i noticed a sort of bouncy feeling in the rear of car. could pressure inside yoke be hindering rear axle movement? if so, should i drill vent hole in yoke or eliminate internal seal. much easier to drill vent & internal seal may help isolate vibrations . what do you guys think?
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Re: 727 yoke question
[Re: DOUGG]
#557535
12/19/09 12:10 PM
12/19/09 12:10 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
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Quote:
the internal seal is designed to seal the outside diameter of output shaft to inside diameter of yoke. the vent hole in yoke was factory drilled. i dont see how it could leak trans. fluid.
The yoke slides on the shaft that is in fluid. That fluid runs into the spined area. Don't beluve it?? try to take the plug out once and see how much of a mess you have.
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Re: 727 yoke question
[Re: MoparforLife]
#557536
12/19/09 12:18 PM
12/19/09 12:18 PM
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Joined: Jun 2003
Posts: 190 Wilmington,NC
I go fast
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Quote:
Quote:
the internal seal is designed to seal the outside diameter of output shaft to inside diameter of yoke. the vent hole in yoke was factory drilled. i dont see how it could leak trans. fluid.
The yoke slides on the shaft that is in fluid. That fluid runs into the spined area. Don't beluve it?? try to take the plug out once and see how much of a mess you have.
Then explain the vent hole! There really isn't that much fluid in the extension housing.
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Re: 727 yoke question
[Re: I go fast]
#557537
12/19/09 03:43 PM
12/19/09 03:43 PM
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Joined: Oct 2009
Posts: 92 south carolina U.S.
DOUGG
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the internal seal i refered to is about 3-4 inches in from end of output shaft. it seals the inside of the front of the yoke to the output shaft,therefore no trans. fluid gets into the yoke,factory used grease for yoke splines.it was only used on 65 and early 66 model slip yokes. so, if yoke is sealed at front and has no vent hole at rear its possible to create hydralic pressure with movement of rear suspension.
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Re: 727 yoke question
[Re: DOUGG]
#557541
12/20/09 06:51 PM
12/20/09 06:51 PM
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Joined: Jan 2003
Posts: 25,910 Rio Linda, CA
John_Kunkel
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You can drill a small hole in the yoke end plug but if the internal seal isn't a perfect seal it will weep fluid. If it sealed before the yoke change it should be OK.
The original hole is dead center in the plug, don't know the size but .060" should do it.
The INTERNET, the MISinformation superhighway
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Re: 727 yoke question
[Re: DOUGG]
#557543
12/21/09 04:30 PM
12/21/09 04:30 PM
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Joined: Oct 2008
Posts: 157 Winlock, Wa
fshd4it
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Now that I've read this thread a few times, my question is about the reverse situation. I replaced the original trans with a 1976 unit, but used the original yoke. Should I tap & plug the vent hole? Out of all my spare yokes, the only one I've got that's the same length has a vent hole in it too. Or is the added lenth only for the internal seal?
In order to know what you want, you'll probably have to find out what you don't want.
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Re: 727 yoke question
[Re: fshd4it]
#557544
12/21/09 06:27 PM
12/21/09 06:27 PM
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Joined: Oct 2009
Posts: 92 south carolina U.S.
DOUGG
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not sure about the length, but it's easy enough to plug it(tap & plug) or plug weld it,you may not have to disassemble it to weld it,not sure.it most likely will leak if it's not plugged.i believe you could look inside one of your other yokes & measure how far in the splines begin from the front, then check this measurement in comparison to same measurement of vented yoke. if difference in the two matches difference in total length, you would have exactly the same engagement(yoke/splines). hope this wasnt confusing.
Last edited by DOUGG; 12/21/09 06:43 PM.
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