#24528 - 10/20/02 03:32 AM
Re: tailshaft extension swapping
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Over the Hill
Registered: 07/14/01
Posts: 1601
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quote:
Originally posted by pez:
Ah-hah, I read through "The Man's" thesis on TCCOA again, and found the answeres... Page 7 indicates that the shorter shaft is stronger than the longer shaft, and also on page 12, he recommends using the shorter shaft, even WITH the longer tailshaft housing.
Problem solved.
Not quite so fast grasshopper ![[Wink]](images/icons/wink.gif)
Reread it, caveat being "If you are having a custom driveshaft made...", then the short output shaft/long tailshaft housing combo is recommended.
With a custom driveline you can move the yoke further into the trans and not lose any spline engagement. Altho the tube part of the driveline would be longer, overall unsupported driveline length would be shorter reducing vibration.
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#24529 - 10/20/02 03:52 AM
Re: tailshaft extension swapping
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Over the Hill
Registered: 11/06/01
Posts: 1660
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Uh-huh...
I don't believe that thesis was written with the Panther platform specifically in mind... The vast majority of those building up these transmmissions and engines, and running a lot of power through them are the 'Stang, T-Bird, Mk VIII types...
I'm not sure that's exactly how he meant it, that the short output shaft and long tailshaft is recommended for a custom driveshaft does not specify that the custom driveshaft must move the yoke further in to the trans, it simply highlights the obvious benefits of having a shorter driveshaft... On P71s and TownCars, this is already done from the factory.
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#24530 - 10/20/02 04:48 AM
Re: tailshaft extension swapping
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Over the Hill
Registered: 07/14/01
Posts: 1601
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quote:
Originally posted by pez:
.....it simply highlights the obvious benefits of having a shorter driveshaft... On P71s and TownCars, this is already done from the factory.
*sigh* I think youre reading too much into what he says and not enough on what he doesnt say.
From the factory both the long output shaft and housing are paired together, you dont see a short output shaft and long housing paired from the factory on any P71 or TC. I think theres a reason for that.
I can see the benefit of switching to the long housing if you had a nonP71, theres room on the yoke for the longer housing and no loss of spline engagement. But on P71s the long housing is already there, dropping in a tranny with a short output shaft is problematic longterm.
Also if the strength of the shorter shaft is of such importance, think about the inch of spline engagement you just lost.
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#24531 - 10/20/02 05:04 AM
Re: tailshaft extension swapping
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Over the Hill
Registered: 11/06/01
Posts: 1660
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I do see your point, and it makes sense.... However, the way I read the article, it seems (to me) to be fairly clear that the shorter shaft is recommended with the longer housing... Maybe it's just the way I'm interpreting it, who knows. Perhaps the strength of longer shaft with it's cut is such that using the shorter, stronger shaft, even with less engagement of the splines, is better...
I realize that your point makes sense- but there's really only one source that we will probably be able to both agree on...
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#24533 - 10/20/02 08:55 AM
Re: tailshaft extension swapping
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Over the Hill
Registered: 12/05/00
Posts: 1347
Loc: Honolulu, HI
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Gentlemen gentlemen....calm your fears. Pogo does raise an interesting point about the spline coverage, but I think it's probably just fine. The yoke on the MMC shaft is actually longer. I just installed an MMC shaft and long tailhousing on my car this weekend. I did a write up along with pictures on my webpage. www.shizzot.com [ October 20, 2002, 08:56 AM: Message edited by: Who's Yo Daddy? ]
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#24534 - 10/20/02 01:23 PM
Post deleted by p74vic
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Metroplectic
Registered: 01/23/01
Posts: 30473
Loc: MCO
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#24535 - 10/22/02 12:49 AM
Re: tailshaft extension swapping
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Climber
Registered: 12/14/01
Posts: 613
Loc: Clemson, SC
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I'm certainly NOT an expert here, but I read it that the long housing and short output shaft are OK if you get a custom driveshaft. To me this implies "if [and only if] you get a custom driveshaft." It's not my car though..
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2000 Mercury Grand Marquis LS
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#24536 - 10/22/02 03:03 PM
Re: tailshaft extension swapping
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Tech Admin
Grand Poobah
Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
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quote:
Originally posted by impala_sc:
I'm certainly NOT an expert here, but I read it that the long housing and short output shaft are OK if you get a custom driveshaft. To me this implies "if [and only if] you get a custom driveshaft." It's not my car though..
"Custom", NO. AMMX, YES.
Folks, ther is no "long" output shaft, believe what you want. THE differences have been very well documented here: length of the housing (longer), and length of the D/S (shorter, combined with a slightly longer input yolk).
Therefore, you need only the PI/TC housing and the factory PI shaft, nothing more.
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#24537 - 10/22/02 05:19 PM
Re: tailshaft extension swapping
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Over the Hill
Registered: 11/06/01
Posts: 1660
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Perfect, that's what I thought. "the man's" thesis on TCCOA DOES mention a longer, WEAKER output shaft though...
And I assume when you mention AMMX YES, that also applies to Al...
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#24538 - 10/22/02 09:51 PM
Re: tailshaft extension swapping
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Poobah
Registered: 04/11/01
Posts: 6289
Loc: New England
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4R70W police vics got a 16" long output shaft 4R70W civilian vics got a 15" long output shaft part numbers and pricing information is avaliable at: http://www.p71interceptor.com/misc/Tranny_Parts.html quote:
Originally posted by SVO-CVPI:
Folks, ther is no "long" output shaft, believe what you want. THE differences have been very well documented here: length of the housing (longer), and length of the D/S (shorter, combined with a slightly longer input yolk).
Therefore, you need only the PI/TC housing and the factory PI shaft, nothing more.
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#24539 - 10/23/02 02:09 AM
Re: tailshaft extension swapping
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Tech Admin
Grand Poobah
Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
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Ooops, never saw THAT info B4.
_________________________
- 2004 Mercury Grand Marquis (GMQ) GS - aka "Data"
Save MILLIONS, vote to outsource our Executives!
What happeded to "government by the people, of the people and for the people"?
RIP Ronald W. Reagan "The Great #40"
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#24540 - 10/23/02 03:11 AM
Re: tailshaft extension swapping
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Over the Hill
Registered: 11/06/01
Posts: 1660
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Meh, regardless, I'll just assume it'll work fine with the short output shaft and long housing... Nothing bad ever come of assuming something, right?
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Signature removed for excessive length. There are rules, Smoky. This isn't 'Nam.
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#24541 - 10/23/02 06:19 AM
Re: tailshaft extension swapping
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Over the Hill
Registered: 07/14/01
Posts: 1601
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quote:
Originally posted by pez:
Meh, regardless, I'll just assume it'll work fine with the short output shaft and long housing... Nothing bad ever come of assuming something, right?
Dont do any drag racing after you swap
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#24542 - 10/23/02 09:23 AM
Re: tailshaft extension swapping
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Tech Admin
Grand Poobah
Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
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Actually I know ppl that have done both go TO the PI stuff from NPI, and go FROM the PI stuff to "stock". It works either way.
_________________________
- 2004 Mercury Grand Marquis (GMQ) GS - aka "Data"
Save MILLIONS, vote to outsource our Executives!
What happeded to "government by the people, of the people and for the people"?
RIP Ronald W. Reagan "The Great #40"
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