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Broken tranny tailshaft housing question #1312002 09/28/12 12:04 PM 09/28/12 12:04 PM
Joined: Feb 2007 Posts: 316 Utah dragnduster OP enthusiast
dragnduster OP enthusiast Joined: Feb 2007 Posts: 316 Utah	I was making a pass yesterday and after I let off the throttle and was coming to a stop all of the sudden I heard a banging noise that lasted a couple of seconds and then went away. The car seemed to drive just fine and after I parked it and was checking things over I found a small amount of tranny oil under the car. I looked closer and found that the tailshaft housing had broke completely off just behind the tranny mount and had been just spinning with the yoke. It slid back into place just fine with no binding on the yoke. I am kinda baffled on what would cause it to break. Anyone ever seen this happen before and have any ideas? Thanks for the help.

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312003 09/28/12 12:11 PM 09/28/12 12:11 PM
Joined: Jan 2003 Posts: 19,368 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,368 Las Vegas	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"

Re: Broken tranny tailshaft housing question [Re: Al_Alguire] #1312004 09/28/12 12:17 PM 09/28/12 12:17 PM
Joined: Feb 2007 Posts: 316 Utah dragnduster OP enthusiast
dragnduster OP enthusiast Joined: Feb 2007 Posts: 316 Utah	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.

Re: Broken tranny tailshaft housing question [Re: Al_Alguire] #1312005 09/28/12 12:19 PM 09/28/12 12:19 PM
Joined: Mar 2008 Posts: 592 Sullivan, Ohio M Max Wedge Savoy mopar
Max Wedge Savoy mopar M Joined: Mar 2008 Posts: 592 Sullivan, Ohio	Lot's of variables here. Do you run rubber motor mounts or solid? Motor plate? Mid plate? Poly trans mount? If you run solid motor mounts or a motor plate and you use a poly trans mount there isn't enough cushion in that hard trans mount to give and the weakest point of the extension housing is right behind the webbing, probably where yours broke. An out of balance driveshaft wouldn't have much of anything to do with it. The bushing inside the extension housing rides on the yoke which is attached to the output shaft.

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312006 09/28/12 12:23 PM 09/28/12 12:23 PM
Joined: Dec 2006 Posts: 235 Tucson AZ. RADAMX enthusiast
RADAMX enthusiast Joined: Dec 2006 Posts: 235 Tucson AZ.	I have done that with a tight u-joint . make sure the u-joints move full swing freely. also if this is a new set up check travel to make sure you are not bottoming it out or Pulling it out to far when I broke mine I was able to just replace the tail housing.

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312007 09/28/12 12:25 PM 09/28/12 12:25 PM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill	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!!

Re: Broken tranny tailshaft housing question [Re: Max Wedge Savoy] #1312008 09/28/12 12:35 PM 09/28/12 12:35 PM
Joined: Feb 2007 Posts: 316 Utah dragnduster OP enthusiast
dragnduster OP enthusiast Joined: Feb 2007 Posts: 316 Utah	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?

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312009 09/28/12 12:38 PM 09/28/12 12:38 PM
Joined: Jan 2003 Posts: 19,368 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,368 Las Vegas	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"

Re: Broken tranny tailshaft housing question [Re: Al_Alguire] #1312010 09/28/12 12:43 PM 09/28/12 12:43 PM
Joined: Feb 2007 Posts: 316 Utah dragnduster OP enthusiast
dragnduster OP enthusiast Joined: Feb 2007 Posts: 316 Utah	Lots of good ideas to check, thanks for all the help. Yes the car was working good before but it was a small block car then with all factory mounts. When I put the 440 in I decided to put in a new drive shaft with it since the old one was just that "old". I have no forward/backward travel limits on this setup, could that be an issue?

Re: Broken tranny tailshaft housing question [Re: Al_Alguire] #1312011 09/28/12 12:50 PM 09/28/12 12:50 PM
Joined: Jan 2003 Posts: 13,368 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,368 Marion, South Carolina [><]	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

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312012 09/28/12 12:57 PM 09/28/12 12:57 PM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill	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, !

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312013 09/28/12 01:29 PM 09/28/12 01:29 PM
Joined: Nov 2006 Posts: 635 mississippi bentwheel43 mopar
bentwheel43 mopar Joined: Nov 2006 Posts: 635 mississippi	I broke 3 & 4 rearend yokes because 1" to long. Section 8 Racing We are nuts about racing.

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312014 09/28/12 01:59 PM 09/28/12 01:59 PM
Joined: Oct 2005 Posts: 164 Savannah, GA mopar400 member
mopar400 member Joined: Oct 2005 Posts: 164 Savannah, GA	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

Re: Broken tranny tailshaft housing question [Re: Max Wedge Savoy] #1312015 09/28/12 04:30 PM 09/28/12 04:30 PM
Joined: Jan 2003 Posts: 25,836 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,836 Rio Linda, CA	Quote: An out of balance driveshaft wouldn't have much of anything to do with it. The bushing inside the extension housing rides on the yoke which is attached to the output shaft. Huh? The INTERNET, the MISinformation superhighway

Re: Broken tranny tailshaft housing question [Re: John_Kunkel] #1312016 09/28/12 04:42 PM 09/28/12 04:42 PM
Joined: Jan 2003 Posts: 525 Shannonville, Ont Blown 68 R/T mopar
Blown 68 R/T mopar Joined: Jan 2003 Posts: 525 Shannonville, Ont	I had a problem with a new shaft it wasn't balanced properly also check to make sure it was measured right,i.e maybe too short, how far back is the yoke sticking out of the housing?

Re: Broken tranny tailshaft housing question [Re: Blown 68 R/T] #1312017 09/28/12 05:46 PM 09/28/12 05:46 PM
Joined: Feb 2007 Posts: 316 Utah dragnduster OP enthusiast
dragnduster OP enthusiast Joined: Feb 2007 Posts: 316 Utah	I will have to get a measurement when I get home, I forget what it was off the top of my head(old age I guess). Sounds like I will make a point of getting the driveshaft rechecked for balance and straightness and hook up some travel limiters on both sides of the motor. I did have to readjust the pinion angle with this rear end I put in and I have it at 3* down with the car at rest on the tires. By the way it is a leaf spring car.

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312018 09/28/12 06:08 PM 09/28/12 06:08 PM
Joined: Nov 2008 Posts: 363 Aubrey, Texas O oldtimer5151 enthusiast
oldtimer5151 enthusiast O Joined: Nov 2008 Posts: 363 Aubrey, Texas	What leaf springs do you have?

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312019 09/28/12 06:26 PM 09/28/12 06:26 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	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.

Re: Broken tranny tailshaft housing question [Re: Sport440] #1312020 09/28/12 06:39 PM 09/28/12 06:39 PM
Joined: Feb 2007 Posts: 316 Utah dragnduster OP enthusiast
dragnduster OP enthusiast Joined: Feb 2007 Posts: 316 Utah	Leaf springs are a factory A body spring with 5 leafs, I put 2 stock type spring clamps on the front half and 1 on the back half since the previous owner had the bolt on type clamps that were so tight the leaves wouldn't slide on each other as the spring tried to compress.

Re: Broken tranny tailshaft housing question [Re: dragnduster] #1312021 09/28/12 06:56 PM 09/28/12 06:56 PM
Joined: Nov 2008 Posts: 363 Aubrey, Texas O oldtimer5151 enthusiast
oldtimer5151 enthusiast O Joined: Nov 2008 Posts: 363 Aubrey, Texas	You will have to run a pinion snubber about 1 inch from floor. Check rear shocks they may have dents next to the housing.

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