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reman 4l60e damaged at dyno question

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Old Apr 5, 2014 | 01:29 PM
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Default reman 4l60e damaged at dyno question

During a recent visit to the dyno shop, I broke/bent/twisted my driveshaft. When I went under the car for repair, I found other parts damaged. The tail housing cover was in 2 pieces. Also I noticed a crack in the cover area around the output shaft just behind the tail housing cover. Not sure what that part is called. My question is how should I go about repair? Is the cracked part a separate part that can be removed and replaced or is it part of the full outer cover? Any help would be greatly appreciated!!
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Old Apr 5, 2014 | 01:30 PM
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Close up of crack
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Old Apr 5, 2014 | 01:35 PM
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Driveshaft slapped the wall inside the driveshaft tunnel. I think that's what caused the crack. Probably was a pretty violent side shock to the output shaft.
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Old Apr 5, 2014 | 02:11 PM
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Hate to say it but you're in for a case. It's all one piece back there. Might want to replace the output shaft as well. Looks like it took a beating and might be bent.
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Old Apr 5, 2014 | 02:39 PM
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Step 1: Remove 4L60e
Step 2: Insert 4L80e
Step 3: Win.
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Old Apr 5, 2014 | 08:15 PM
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Yeah, the trans case is toast.
I have always been very satisfied buying large parts from ebay seller "powertrainpartsplus". They have a few late-model 4L60E cases available right now for $60 plus shipping. Output shaft is $33. They also have tail housings.

You should try to determine what broke first - was it a U-joint?
I have heard of the torque arm cracking the tail housing which might have started a chain reaction.

If you are looking at 600+HP in the future, JoeNova's suggestion should be seriously considered; there are lots of threads here on that subject.
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Old Apr 6, 2014 | 10:16 PM
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Originally Posted by mrvedit
Yeah, the trans case is toast.
I have always been very satisfied buying large parts from ebay seller "powertrainpartsplus". They have a few late-model 4L60E cases available right now for $60 plus shipping. Output shaft is $33. They also have tail housings.

You should try to determine what broke first - was it a U-joint?
I have heard of the torque arm cracking the tail housing which might have started a chain reaction.

If you are looking at 600+HP in the future, JoeNova's suggestion should be seriously considered; there are lots of threads here on that subject.
From the looks of it, the problem started where the stock torque arm attaches to the tail housing. I think it was because of worn bushings in the connection point. The clasp type mechanism. It was an original piece that I didn't change when I did the conversion. The car had 280,000 plus miles on before I swapped the 3800 for the 6.2. I'm just imagining that the worn bushing gave more than it was suppose to which allowed the rear end to reach a dangerous pinion angle which caused the driveshaft to fail. Could be wrong.
does that sound possible?
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Old Apr 7, 2014 | 04:41 PM
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I don't own a car with a torque arm and therefore cannot give you an experienced answer. It does sound "possible"; in any case repairing/replacing the driveshaft, trans case, trans tail shaft, torque arm and bushings should get it fixed. Of course all that is a very expensive fix.
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Old Apr 8, 2014 | 02:35 PM
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The stock steel driveshafts are prone to this, especially
when overspun (anything over 2.73 gears got aluminum
driveshaft from the factory). Don't know how a V6 drive
shaft relates to what came behind the V8 with 2.73s,
but expect no better.
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Old Apr 11, 2014 | 10:31 PM
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wouldn't the steel be better than the aluminum ones?
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Old Apr 12, 2014 | 12:16 PM
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A well engineered steel driveshaft would be better.
A "cost engineered" one, plenty of examples say is
not.
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Old Apr 12, 2014 | 04:06 PM
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Damn because my car just took a **** on the aluminum shaft and was gonna throw in a steel one i had here.
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Old Apr 12, 2014 | 05:13 PM
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I just had a custom aluminum one made by shaftmasters.com (local to me, but recommended elsewhere on this site). They said it is good for 3000 ft/lbs which equates to 1000 ft/lb engine and a 3.0/1 1st gear trans ratio.
The car is super smooth with it; I suspect my previous custom steel one was a bit out of balance. Cost about $325.
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Old Apr 12, 2014 | 09:43 PM
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Custom Chrome-Moly driveshaft from Strange Engineering . . .

http://www.strangeengineering.net/dr....html?limit=48
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