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Old 10-11-2007, 03:21 PM   #1
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UPDATED: When the tranny goes boom...

Ouch...

Catastrophic tranny failure with Kenne Bell on dyno - ModularFords.com

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Quote:
Originally Posted by Psiperformance View Post
Pics will be up shortly but heres the sumation.

we just finished a kb stage 3 install on a gt-500 with 2100 miles.

the blower was runing a 2 7/8 pulley

after warmup and test driving the car around for driveability and doing a few short pulls to check air fuel we went to make our first full pull..

at 4800 rpm the transmission LOCKED UP in fourth gear and the resulting force snaped the transmission mount clean in half on both sides where it bolts to the body

ripped the spot welds out of the passenenger side sheet metal that the mount bolts to

completely ripped the bell housing into 4 pieces

the trany then droped down and spun in the trans tunel ripping the sifter off the floor

and when the trany fell down the drive shaft was at such a extreme angle in the rear that the u joint sadle was crushed by the back side of the shaft breaking the saddle and allowing the ujoint < wich is still whole and un broken > to drop out of the sadle.

The drive shaft spun violently in the tunnel beating the tunnel all to hell with huge damage to the floor pan.

At the moment we are trying to figure out just wth caused all this.

Seems like the transmission locked up transfering all the power into the case and twisting it in the body.

The transmission is confirmed locked in fourth gear you cant move the input shaft or the out put.

So far its the only thing that I can see or think of that could cause such a catastrophic failure.

Pics:

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Originally Posted by Psiperformance View Post
here we go pictures

this is the damage to the floor those are quarter inch thick steel plates they have gouges that go all the way almost through there are chuncks the size of larger grapes and one golf ball gone from the concrete area.


This is the transmission as it came out of the car .. bell housing is in five pieces the transmission mount in three.



here are the trany mounts wich sheared instantly and are still bolted to the body


here is the drive shaft u join flange showing where the angle of the shaft caused the drive shaft to crush the u join sadle when the trany dropped



here is the trans tunnel damage

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Old 10-11-2007, 03:23 PM   #2
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Re: When the tranny goes boom...

wow
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Old 10-11-2007, 03:35 PM   #3
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Re: When the tranny goes boom...

holy crap!
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Old 10-11-2007, 04:31 PM   #4
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Re: When the tranny goes boom...

perfect reason to run drive shaft loops and bulletproof belhousing
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Old 10-11-2007, 04:45 PM   #5
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Re: When the tranny goes boom...

Damn...Good luck getting Ford to do any warranty work with that...
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Old 10-11-2007, 05:20 PM   #6
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Re: When the tranny goes boom...

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Originally Posted by hottcobra View Post
perfect reason to run drive shaft loops and bulletproof belhousing
Exactly.... Imagine if the clutch would have exploded at 6500 rpm 2:2: "Feet, what feet?" People don't realize with great power, comes great responsibility.... or something.. In any car with more than 175 or more hp than stock, I would just not rely on stock supporting hardware.
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Old 10-11-2007, 07:18 PM   #7
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Re: When the tranny goes boom...

Now there's some owned sauce on your *****.
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Old 10-11-2007, 09:24 PM   #8
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Re: When the tranny goes boom...

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Originally Posted by bullitt482 View Post
Exactly.... Imagine if the clutch would have exploded at 6500 rpm 2:2: "Feet, what feet?" People don't realize with great power, comes great responsibility.... or something.. In any car with more than 175 or more hp than stock, I would just not rely on stock supporting hardware.
cwhen a clutch/flywheel goes out thats some pretty nasty carnage. dsm guy a while back lost a few toes to this, luckily for him he was shifting and his foot was up off the gas and got him in his toes or else it wouldve taken out an ankle. ive always told myself if i ever drop the tranny (in any of my cars) a scattershield would be a pretty justifiable buy, a "while im down there" item.
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Old 10-12-2007, 03:03 AM   #9
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Re: When the tranny goes boom...

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People don't realize with great power, comes great responsibility.... or something.. .

I feel ya. I'm surprised that wasn't a Honda.

Anyway, I have been thinking that next time I add some mods to my car that one would be a driveshaft loop, but after seeing that I think when I upgrade my clutch I will be getting a better bellhousing. People can hate on the GT500's all they want, but they can make a *** of power. Thats an upgraded(its got a different name than T-56) Viper spec T-56.
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Old 10-12-2007, 09:35 AM   #10
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Re: When the tranny goes boom...

Damn
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Old 10-14-2007, 10:07 PM   #11
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Re: When the tranny goes boom...

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Originally Posted by JROC View Post
Thats an upgraded(its got a different name than T-56) Viper spec T-56.
Are you talking about D and D performance's 6 speed or the TR6060??
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Old 10-14-2007, 10:45 PM   #12
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Re: When the tranny goes boom...

The GT500's come with the Tremec TR6060, I just couldn't remember the name. From my understanding its suppose to be a Viper spec transmission. I assume that means its as strong as the transmissions in the Dodge Vipers.

Tremec TR-6060 transmission - Wikipedia, the free encyclopedia
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Old 10-14-2007, 11:22 PM   #13
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Re: When the tranny goes boom...

what numbers was this certain GT500 putting out? perhaps there is a dyno sheet of said catastrophic run?

i nary hear of KB Cobra guys blowing trannies, or anyone really blowing T56's in general. would be nice to have a pretty definitive rule of thumb as to when your tranny is on borrowed time.
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Old 10-15-2007, 10:57 AM   #14
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Re: When the tranny goes boom...

There were just starting to tune that car...they don't have any numbers on it. They had just installed the KB before that run. So nothing is known.
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Old 10-15-2007, 11:23 AM   #15
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Re: When the tranny goes boom...

holy schneikies...
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Old 10-15-2007, 12:16 PM   #16
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Re: When the tranny goes boom...

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There were just starting to tune that car...they don't have any numbers on it. They had just installed the KB before that run. So nothing is known.
so the car was moving on the dyno but they were not logging anything?
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Old 10-15-2007, 12:30 PM   #17
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Re: When the tranny goes boom...

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so the car was moving on the dyno but they were not logging anything?
No, the car was moving on the dyno and all hell broke lose and it became a non-run.

If you read most of the posts, you see that the car had about 200 5-6k rpm launches....and it is believe that may have chipped a tooth or teeth off first gear which worked its way back in the tranny and happened to lock it up. It wasn't a matter of the car making too much power...it was a matter of something breaking due to excessive abuse.
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Old 10-15-2007, 01:30 PM   #18
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Re: When the tranny goes boom...

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No, the car was moving on the dyno and all hell broke lose and it became a non-run.

If you read most of the posts, you see that the car had about 200 5-6k rpm launches.

Was he still on the stock clutch? I have heard that some people are having problems with the stock GT500 twin disk clutch.
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Old 10-15-2007, 01:35 PM   #19
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Re: When the tranny goes boom...

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Originally Posted by JROC View Post
Was he still on the stock clutch? I have heard that some people are having problems with the stock GT500 twin disk clutch.
Read the writeup. I don't remember all of the details.
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Old 10-20-2007, 02:56 PM   #20
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Re: When the tranny goes boom...

They tore down the tranny...here is what it looks like inside...I think we now know what cause the boom....

Quote:
Originally Posted by Psiperformance View Post
For those who questions my diagnoses and tried to blame the drive shaft.

please explain how a broken drive shaft does the following to the gears inside the trany







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Old 10-22-2007, 12:09 AM   #21
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Re: UPDATED: When the tranny goes boom...

umm how the hell would a driveshaft cause a tranny to grenade?

looks like a simple tranny failure, cut and clear to me. overstress a part past its design tolerances and you might get away with it for a while, but one day you will find out where the weak spot is.
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Old 10-22-2007, 05:18 AM   #22
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Re: UPDATED: When the tranny goes boom...

bet that made quite a bit of noise. They definitly should have upgraded some of the stockers if they planned on doing that many high rpm launches. just stupidity. they are lucky nobody got seriously injured w/ the driveshaft and other maetal parts flying around violently under the car.
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Old 10-22-2007, 08:51 AM   #23
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Re: UPDATED: When the tranny goes boom...

I think the answer is quite obvious...

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Old 10-22-2007, 02:32 PM   #24
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Re: UPDATED: When the tranny goes boom...

^ nice
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Old 10-22-2007, 10:39 PM   #25
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Re: UPDATED: When the tranny goes boom...

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bet that made quite a bit of noise. They definitly should have upgraded some of the stockers if they planned on doing that many high rpm launches. just stupidity. they are lucky nobody got seriously injured w/ the driveshaft and other maetal parts flying around violently under the car.
i dont think you do high rpm launches on a dyno.........
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Old 10-23-2007, 01:19 AM   #26
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Re: UPDATED: When the tranny goes boom...

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i dont think you do high rpm launches on a dyno.........
He's refering to the fact that the owner has about 200 passes at the track...where he launches very high in the RPM range...don't remember exactly, but it is somewhere in the thread or the text I copied.
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Old 10-23-2007, 01:41 AM   #27
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Re: UPDATED: When the tranny goes boom...

ah. no wonder his tranny just loves him to death.
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Old 10-23-2007, 01:50 AM   #28
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Re: UPDATED: When the tranny goes boom...

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ah. no wonder his tranny just loves him to death.
And yet he, and several forum members on that thread, were trying to point the finger at the dyno shop as being to blame. Um...don't think the tranny was designed to take that kind of abuse. If it was, it wouldn't have 1/8" thick aluminum mounts...all the connection points would be steel.
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Old 10-23-2007, 07:20 AM   #29
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Re: UPDATED: When the tranny goes boom...

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i dont think you do high rpm launches on a dyno.........
I thinks thats a little obvious...

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Originally Posted by PureVenom View Post
He's refering to the fact that the owner has about 200 passes at the track...where he launches very high in the RPM range...don't remember exactly, but it is somewhere in the thread or the text I copied.
TY
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