WOW how does this happen!!!! Cracked transaxle case - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-27-2008, 11:02 PM   #1
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Default WOW how does this happen!!!! Cracked transaxle case

I sold my bonneville to a good friend, so i help him out with any problems,

Today on my way home i started to follow a trail of fluid going to my drive way
there he was waiting, he said he was just driveing and herd a clunk then the car started to pull to one side, Its leaking trany fluid BAD!!

So i looked and seen this!!!!





Is the trany fucked??
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Old 04-27-2008, 11:08 PM   #2
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That looks like the diff case. That'd take some serious abuse to do that. Some one wheel burnouts would definitely do it. If he was abusing the car, I highly doubt he deserves free help fixing it. I don't think I've ever seen a blown diff on a THM440T4 with only an LN3 in front of it...

Opinions aside, As far as fixing it...it would be best to just grab a JY trans and replace it.
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Old 04-27-2008, 11:24 PM   #3
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Sorry this needs to be moved, the car is a 93 not a 91
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Old 04-27-2008, 11:27 PM   #4
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That is a classic symptom of cutting the wheel hard, and doing burnouts around corners numerous times.
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Old 04-27-2008, 11:30 PM   #5
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He said it hapend when he pulled into a gas station,

Its on the passenger side, where the axle plugs into the trany, It looks like the brokeing part bolts off. its just hanging by the trany mount.

Is the Diff replaceable? he dont bet the car could a bad axle do this? The trany mount broke off with half the diff case, Maby that trany mount was bad?
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Old 04-27-2008, 11:57 PM   #6
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Better pic'*



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Old 04-28-2008, 02:14 AM   #7
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These score marks on the inside of the extension housing (diffy cover):
Name:  DiffScore.jpg
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Indicate that the roll pin holding the spider gear pinion came out, and the pinion came loose, scoring the inside of the housing and eventually breaking it. This is a far-too-common failure mode on 4T6x, (and is accelerated by one-wheel burnouts and general hard-pounding the trans).

EDIT: It'* also possible that a spider gear cracked, or the pinion itself wore down and cracked, but anyway any of these things lead to what you see, and all are accelerated by burnouts / hard launching.

Drop the pan and see what'* in there and inside the filter (cut it open) before deciding what to do next.
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Old 04-28-2008, 11:11 PM   #8
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I will post some pic'* of the pan and filter when this rain stops,

The car is a 93 Im sorry i posted in the wrong forum,

Can a Moderator plz move it to 1992-1999 forum.
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Old 04-28-2008, 11:33 PM   #9
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That is a classic failure. Ask Willwren. Same thing happened to his trani a couple of years ago.
It can be fixed by simply replacing the differential cover, I think without replacing the whole trani but now would be a good time for a total rebuild. Hope you have $2,500 saved up.
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Old 04-30-2008, 01:49 AM   #10
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your better off getting a low mile JY tranny for $200 and putting that in
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