Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: mopar65]
#1058740
08/21/11 06:38 PM
08/21/11 06:38 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I think when you took out the rear it cracked the tail, since you said the drive shaft is fine and you dont have any vibrations.... I'm thinking you never looked to see if it was cracked.... then add a few more launches and.... you know
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: mopar65]
#1058744
08/21/11 07:14 PM
08/21/11 07:14 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
thanks for the info guys. I am pretty sure i checked everything over.but maybe i missed the tail shaft. so do you guys think i could just install a new tail shaft and be ok? the car did drive on the trailer under its own power and i was running around 125-126 mph in the 1/4 last nite? thanks bobby
ALL cars flex its just a mater of how much... I think the car flex took it out.... even with the rubber mount... and being NEW its stiffer than a old one..... JMO
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: mopar65]
#1058746
08/21/11 07:17 PM
08/21/11 07:17 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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Hi man,I broke 3 just like that,turn out my driveshaft was 1" to long.~~~ bentwheel43
Section 8 Racing We are nuts about racing.
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: bentwheel43]
#1058747
08/21/11 09:08 PM
08/21/11 09:08 PM
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Joined: Dec 2007
Posts: 10,542 BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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When my diff broke it did cause the tail shaft to break in about the same place. It was on the launch off a T brake so it was instant and a little more violent then yours was.
I would suspect that yours was cracked when your diff broke then just took a little longer for it to come apart.
FWIW, my output shaft was OK and just needed a new tail shaft housing but definitely get your checked.
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: DaveRS23]
#1058749
08/21/11 10:29 PM
08/21/11 10:29 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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They all break in the same place... through the speedo hole... its just the weak point of the tail shaft... its a matter of what causes it... I have a buddy that has a quick car that went through 3 tail shafts in 4 weekends... his was a bit different but he has a front plate, mid plate and he was running a solid trans mount... I told him the first time to get rid of the solid trans mount... he didnt... then after the third he finally did... since then its been fine.... you cant tell how much flex a car will have
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: mopar65]
#1058750
08/21/11 10:32 PM
08/21/11 10:32 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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sometimes it hard to say what broke yours? i know of allot of them that racers i personaly know , and race with have broken so many and with diffrent trans in same day that now they carry couple as spares, now for me , i have never broke a 1 not a single one ,, one can blame a previous breakage, etc, i have even heard that tires being out of balance will do it to? ring pinion gears , lose pinion nut,, so i wouldnt say could be all the above, i waiting for someone to mount a camera on that area, and look n see what type of flex is going on in that area during launch and de-accelleration, and what type of forward/rearward movement get involved as well, during a run? just a thought
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: mopar65]
#1058754
08/21/11 11:23 PM
08/21/11 11:23 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
thanks for the replys guys.I am still runing the 8-3/4 in my dart. dont have the money for the dana yet.I am running the 318 to big block coversion motor mounts and the stock tansmission mount.I will have to check to make sure. but i think i have over a inch of the yolk sticking out of the tail shaft.how much are you soposed to have? i know stuff breaks but this is a frist for me.yes i would like to find one out of a van or a truck. i have heard they are stronger.I have another tail shaft i am going to put on it.for no so at least i can move it off the shop floor if i need to and have to wash all the trans fluid off the bottom of the car.i might just find another trans to build up and use this one for spare parts. or if you guys think i will be ok to just put a new tail shaft on this one and try it again?thanks Mopar65
Should only have 3/4" on the drive shaft length... so bottoming out sure wasnt the problem
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: MR_P_BODY]
#1058755
08/21/11 11:51 PM
08/21/11 11:51 PM
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Joined: Dec 2007
Posts: 10,542 BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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When mine broke I went through the trans to check everything and it was all good so I put a new tail housing on and let er rip.
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: Dart1031]
#1058757
08/22/11 11:40 AM
08/22/11 11:40 AM
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Joined: Mar 2007
Posts: 12,008 Finally a HUSKER again
Moparnut426
I Live Here
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I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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Quote:
Am I seeing things, or is the bushing in that mount junk?
I agree, Looks like all the weight is smashing it down almost grounded to the bolt going through it.
That could be it. If its a motor plate car, its putting stress everywhere.
Kasey
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: dennismopar73]
#1058762
08/22/11 01:30 PM
08/22/11 01:30 PM
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Joined: Mar 2009
Posts: 1,058 bigfork mn
dragram440
super stock
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super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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I thought if you ran solid engine mounts you had to have a solid trans mount?
67' charger 499 RB
10.57 at 127
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: dragram440]
#1058763
08/22/11 01:41 PM
08/22/11 01:41 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I thought if you ran solid engine mounts you had to have a solid trans mount?
I sure wouldnt... reason why is flex in the car... if you have 2 points solid (now thats a straight line) it can pivot BUT if you have a front plate, mid plate and a solid trans mount, now you have 3 points which doesnt mean its still a straight line, specially when you induce flex... I always use a rubber trans mount and I have never broke a tail shaft.... some guys use the solid trans mount as a engine limiter... I prefer to put a engine limiter on the engine(I happen to use 2 of them)
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: rickraw]
#1058766
08/22/11 08:42 PM
08/22/11 08:42 PM
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Joined: Jul 2009
Posts: 694 Michigan
Super Scamp
mopar
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mopar
Joined: Jul 2009
Posts: 694
Michigan
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With mulitable good answers on this post, I'm going to throw my in the mix. 1. you see the shaft and the cast aluminum is almost completely sheered off in a complete circle. 2. stress from the axle twist in the upward movment pulling the drive shaft out of the trans as the motor is twisting the tork monster. 3. Time for a front plate, or solid mounts. 4. Poloy mount on the trans. 5. Snubber on the twisting 8 3/4 I have see a friend break his tale shaft in the speed "O" area and he locked up his trans and hurt the 8 3/4 to the ponit of putting in a Dana, and 2500 dollar trans.
Just One Man's Opinion
Mopar Mafia Racing
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: Super Scamp]
#1058767
08/22/11 09:22 PM
08/22/11 09:22 PM
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Joined: Nov 2003
Posts: 4,027 Dearborn Hts, MI
Sledge_57
master
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master
Joined: Nov 2003
Posts: 4,027
Dearborn Hts, MI
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Have that DS checked again. When I broke mine it was "supposedly" good too. Brand new from Mancinis balanced and all.
After it took out the tailshaft housing I took my shaft to a GOOD DS shop (Dynotech) not only was my "NEW" DS not balanced worth a damn, it was bent like a banana.
Doug
1967 "Pedal Car" 500" low deck , TF 727, 4.30 Locker Best to Date: 11.67 @ 114.9 1.64 60ft
"Kids in cars cause accidents. Accidents in cars cause kids..."
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: mopar65]
#1058771
08/22/11 10:28 PM
08/22/11 10:28 PM
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Joined: Jun 2004
Posts: 6,780 Alabama
Mopar-Al
master
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master
Joined: Jun 2004
Posts: 6,780
Alabama
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Quote:
Quote:
Just to clarify the wording a bit more here. You pushed the yoke into the tailshaft all the way and then pulled it out 1 inch for clearance? As Mr P had said, it needs 3/4 inch to travel. not 1 inch sticking out. If you didn't have this travel, it will bind and break. Many a person has fallen to this mis hap before. [/quote
]
I guess i am not following what you are saying. but yes if i remember right.i pushed the yolk in all the way and pulled it out a inch and then measured for my drive shaft lenght. are you saying that was the wrong way of doing it? if so what is the right way? thanks mopar65
that's the right way
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: Mopar-Al]
#1058772
08/22/11 11:22 PM
08/22/11 11:22 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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We had our first break like that in a car with elephant ears, stock trans mount, etc and when we finally welded in a limiter to control fore and aft movement of the engine it never happened again--just my 2 cents worth--good luck getting her fixed
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: Sledge_57]
#1058773
08/23/11 12:30 AM
08/23/11 12:30 AM
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Joined: Jan 2003
Posts: 1,090 Saskatchewan, Canada
barracudabob
super stock
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super stock
Joined: Jan 2003
Posts: 1,090
Saskatchewan, Canada
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Quote:
Have that DS checked again. When I broke mine it was "supposedly" good too. Brand new from Mancinis balanced and all.
After it took out the tailshaft housing I took my shaft to a GOOD DS shop (Dynotech) not only was my "NEW" DS not balanced worth a damn, it was bent like a banana.
Exactly the same thing happened to me. I bought a really good (expensive) driveshaft. Second run, broke the tail housing. Sent the driveshaft to a driveline shop, and it was bent, and poorly balanced. They rebalanced and straightened it, no more problem.
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: MR_P_BODY]
#1058776
08/23/11 02:24 AM
08/23/11 02:24 AM
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Joined: Oct 2003
Posts: 2,537 PORT ALBERNI , BC., CANADA
superwrench
master
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master
Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
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Quote:
Quote:
I thought if you ran solid engine mounts you had to have a solid trans mount?
I sure wouldnt... reason why is flex in the car... if you have 2 points solid (now thats a straight line) it can pivot BUT if you have a front plate, mid plate and a solid trans mount, now you have 3 points which doesnt mean its still a straight line, specially when you induce flex... I always use a rubber trans mount and I have never broke a tail shaft.... some guys use the solid trans mount as a engine limiter... I prefer to put a engine limiter on the engine(I happen to use 2 of them)
Solid mount the engine...but never solid mount the trans...use the Poly bushings. Something needs to give a bit.
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Re: !!!Broke my auto trans tail shaft!!!! what cause it
[Re: superwrench]
#1058777
08/23/11 03:02 AM
08/23/11 03:02 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Yeah bobby, have the DS checked, When i built my Duster i had them build a custom DS & never broke a TS, I remember bringing in a DS that looked fine on another build, luckally i did, it was bent "bad", couldn't tell by looking at it, but once on there machine i was shocked at what i didn't see .
Last edited by joedust451; 08/23/11 03:05 AM.
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