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Exploding 4l60

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Old Jan 13, 2011 | 11:29 AM
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Default Exploding 4l60
I recently had a 1995 4l60 rebuilt w/ some upgrades cosisting of a sun shell and a better sprag. I was on the tollway and on the 17th mile of the new trans it exploded, broke the bellhousing, converter, driveshaft, torque arm, crossmember, exhaust, output shaft, front sleave that goes into converter and put a hole in the floor!

This trans went back in with the same driveshaft as it had before, same converter,same everthing and it was fine before the rebuild.

The pump blew out of front of trans and started the carnage, anybody have any idea why this trans came apart?
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Old Jan 13, 2011 | 05:56 PM
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end play was too tight most of the time with the beast you will have to change the washer on the back of the drum to a thinner washer to correct endplay which is nominal at about .012. if its too tight when the trans grows from heat it will blow the front pump right out of the case
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Old Jan 13, 2011 | 06:34 PM
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Originally Posted by Predator T/A
end play was too tight most of the time with the beast you will have to change the washer on the back of the drum to a thinner washer to correct endplay which is nominal at about .012. if its too tight when the trans grows from heat it will blow the front pump right out of the case
When you say Beast you are refering to the shell?
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Old Jan 13, 2011 | 06:39 PM
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yes the "beast" sunshell as i assume that was the sunshell upgrade.
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Old Jan 13, 2011 | 07:01 PM
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Wow dude what a ******* nightmare. Sorry to hear
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Old Jan 13, 2011 | 07:36 PM
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Pictures?
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Old Jan 13, 2011 | 08:21 PM
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Did you have a warranty?
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Old Jan 13, 2011 | 08:22 PM
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Hope someone is reimbursing you..
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Old Jan 13, 2011 | 08:37 PM
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The TC not being properly seated can cause this.
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Old Jan 13, 2011 | 10:55 PM
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Glad your alright, hope you can get it sorted out with the rebuilder.
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Old Jan 14, 2011 | 12:10 AM
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Holy **** I bet that was a WTF moment.
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Old Jan 14, 2011 | 11:52 AM
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Originally Posted by 01ssreda4
Holy **** I bet that was a WTF moment.
Hell yea it was!

The Trans guy said he will replace the trans
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Old Jan 14, 2011 | 11:59 AM
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You say a hole in the floor dude? I have to see this!
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Old Jan 14, 2011 | 12:07 PM
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had this happen before as well...

when it goes back in, get a decent driveshaft for good measure...stock ones are garbage and nearly always bent/out of balance
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Old Jan 14, 2011 | 12:10 PM
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Originally Posted by Anthony Williams
The TC not being properly seated can cause this.
+1 to this its happened to me rushing before.
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Old Jan 14, 2011 | 12:11 PM
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When i blew my pump out i just lost all gears nothing else happened didnt break a thing. besides the guts in the pump
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Old Jan 14, 2011 | 05:12 PM
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if the converter was installed improperly it probably wouldnt have made it 17 miles.
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Old Jan 14, 2011 | 10:11 PM
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Originally Posted by Predator T/A
if the converter was installed improperly it probably wouldnt have made it 17 miles.
Exactly what I was thinking, I was really careful about seating the convertor
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Old Jan 14, 2011 | 10:22 PM
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17 miles was just enough for the trans to get good and hot and push the pump out thats what front endplay does when its too tight.
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