Re: Broken tranny tailshaft housing question
[Re: dragnduster]
#1312003
09/28/12 12:11 PM
09/28/12 12:11 PM
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Joined: Jan 2003
Posts: 19,385 Las Vegas
Al_Alguire
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I Live Here
Joined: Jan 2003
Posts: 19,385
Las Vegas
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Have the driveshaft checked to ensure it is balanced. In my experience 99% of the time a broken tailshaft is caused by a driveshaft issue.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Broken tranny tailshaft housing question
[Re: Al_Alguire]
#1312004
09/28/12 12:17 PM
09/28/12 12:17 PM
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Joined: Feb 2007
Posts: 316 Utah
dragnduster
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enthusiast
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OP
enthusiast
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Posts: 316
Utah
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That's a good idea, it is an all brand new shaft with just 5 runs on it but that don't mean it couldn't be the problem. Will breaking the housing like that cause any other problems with the tranny that I should check for or can I just replace the housing?
Last edited by dragnduster; 09/28/12 12:18 PM.
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Re: Broken tranny tailshaft housing question
[Re: dragnduster]
#1312007
09/28/12 12:25 PM
09/28/12 12:25 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
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ill
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Yes need to check the out put shaft! I have never broke one, but I have seen plenty of others tho!! Check the rear mount for movement, A motor can ' charge ' forward under de-accell if the drive shaft is to short can cause issues,, same as charging forward under heavy load, bent drive shaft, bad u joints,, look for binding in the shafts movement area!!
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Re: Broken tranny tailshaft housing question
[Re: dragnduster]
#1312009
09/28/12 12:38 PM
09/28/12 12:38 PM
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Joined: Jan 2003
Posts: 19,385 Las Vegas
Al_Alguire
I Live Here
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I Live Here
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Posts: 19,385
Las Vegas
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Well yes a lot of things can cuase this problem but I have seen a LOT of Mopar tailshaft housing break and all but 1 were from the driveshaft. Either to long, or two short or not balanced. With balance being the usual cause of failure. The fact that it is new means little unfortunately these days. Since it is a new shaft and this occurred it woudl be where I would start. Assume this car was working with a different set up before??
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Broken tranny tailshaft housing question
[Re: Al_Alguire]
#1312011
09/28/12 12:50 PM
09/28/12 12:50 PM
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Joined: Jan 2003
Posts: 13,404 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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Quote:
Well yes a lot of things can cuase this problem but I have seen a LOT of Mopar tailshaft housing break and all but 1 were from the driveshaft. Either to long, or two short or not balanced. With balance being the usual cause of failure. The fact that it is new means little unfortunately these days. Since it is a new shaft and this occurred it woudl be where I would start. Assume this car was working with a different set up before??
I've broken two tailshaft housings and both times the cause was a twisted driveshaft.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Broken tranny tailshaft housing question
[Re: dragnduster]
#1312012
09/28/12 12:57 PM
09/28/12 12:57 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
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Quote:
I run a solid mounted engine plate with the spool style factory rubber tranny mount. I have run that same setup on several other cars over the last 25 years with good luck but maybe this time is different. U-joints didn't seem overly tight but I will recheck. The yoke wouldn't be able to bottom out but it ended up hanging out about 3/4" more than I would have like it to be when the car is at rest, so maybe it slipped a little to far out and caused the problem. Wouldn't it slip out of the tranny more on decel and into the tranny on excelleration?
It will and can travel either direction equally! under accell it will try to push the shaft into the trans, under de accell it will pull it out, depending on the 'roll' of the suspension . I would look at the balance, and see how straight the shaft is,, I had a new shaft and it was bent , got it from a drive shaft co out of Florida, never got in because I checked it out, !
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Re: Broken tranny tailshaft housing question
[Re: dragnduster]
#1312013
09/28/12 01:29 PM
09/28/12 01:29 PM
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Joined: Nov 2006
Posts: 635 mississippi
bentwheel43
mopar
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mopar
Joined: Nov 2006
Posts: 635
mississippi
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I broke 3 & 4 rearend yokes because 1" to long.
Section 8 Racing We are nuts about racing.
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Re: Broken tranny tailshaft housing question
[Re: dragnduster]
#1312014
09/28/12 01:59 PM
09/28/12 01:59 PM
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Joined: Oct 2005
Posts: 164 Savannah, GA
mopar400
member
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member
Joined: Oct 2005
Posts: 164
Savannah, GA
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I had this issue with too much pinion angle. The car was smooth going down the track but when I let off the gas I was getting a vibration. The pinion would fall on decel. and put the rear joint in a bind. Too many passes before I could get it fixed caused the tail housing to crack by the speedo hole. I ended up winning that day but was dripping trans. fluid on the last pass! I was a young kid and had set the pinion angle up incorrectly. Lesson learned! Kevin
1965 Fury II
1970 Challenger 440, 509 cam, 11:1 w/ 452 iron heads, 6.99 1/8, 11.29@ 120mph 1/4
(1999 Magnolia Drag strip track champion)
1992 Jeep XJ Crawler
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Re: Broken tranny tailshaft housing question
[Re: dragnduster]
#1312019
09/28/12 06:26 PM
09/28/12 06:26 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
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Posts: 6,591
Canton, Ohio
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Yep, alot of variables. Bent shaft, out of balance shaft, to short of shaft, binding pinion angle issues, tranny and engine bolted together in a stressed condition alignment, etc.
The shaft does pull out on decell, if it comes out to far it can shake and break the tail housing.
Or a combination of any of the listed variables can stack up and break the housing too.
With your spool mount I think you would have enough driveline flex to avoid a stress break. Id focus on blance, length and staightness.
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