Zip 3.54 Diff & question (pics)
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,710
Likes: 1
From: Green Bay WI
Zip 3.54 Diff & question (pics)
Well, here it is - just arrived today. :D Only thing is this... I noticed some small cracks at the back of the housing (you can see them in the front and closeup shots). :( Are these normal for a reconditioned housing or should I send 'em back and get a replacement?
Front (notice cracks in back)
Second Front shot
Back
Left Side
Right Side
Top
Those cracks I was talking about
Front (notice cracks in back)
Second Front shot
Back
Left Side
Right Side
Top
Those cracks I was talking about
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Re: Zip 3.54 Diff & question (Ramrod92)
I had the same question when I bought mine. I took it to a buddy of mine who rebuilds transmissions (to get the yokes installed, and by the way have fun doing that) and he said it was casting marks. The one I took out of the car had them as well. But just to be safe I would get hold of Justin as well.
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
Re: Zip 3.54 Diff & question (cprgmr)
Only thing is this... I noticed some small cracks at the back of the housing (you can see them in the front and closeup shots). :( Are these normal for a reconditioned housing or should I send 'em back and get a replacement?
Tom Piper
Drifting
Joined: Jan 2001
Posts: 1,669
Likes: 1
Re: Zip 3.54 Diff & question (93LT1)
Those are casting marks in the housing. You can't do anything about them and all of them have them. They will not hurt anything and that housing is not any weaker because you can see them. It is just the way that Dana cast them.
Justin
Justin
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,710
Likes: 1
From: Green Bay WI
Re: Zip 3.54 Diff & question (cprgmr)
Sounds good guys - thanks for the info. I emailed Andy (guy who I coordinated the purchase through) just to make sure. Now for those yokes...
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Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,710
Likes: 1
From: Green Bay WI
Re: Zip 3.54 Diff & question (cprgmr)
Sounds good guys - thanks for the info. I emailed Andy (guy who I coordinated the purchase through) just to make sure. Now for those yokes...
Drifting
Joined: Nov 1999
Posts: 1,502
Likes: 12
From: Yorktown Heights NY
Re: Zip 3.54 Diff & question (cprgmr)
This is a direct result of the casting process. When you take a molten metal and inject it into a mold under pressure, the mold is alot cooller than the molten aluminum, thus the aluminum literally freezes to the interior of the mold. These are normal surface shrinkage cracks that are very superficial (not deep). This is removed in the machining process where a part has a tight fit-up tolerance, and is therefore never seen in a machined part. The interior of the differential case, however, whwre you have noticed the casting surface shrinkage cracks is a non-machined location. This is a perfectly normal condition in an unfinished surface of an aluminum casting :)
Melting Slicks
Joined: Mar 2002
Posts: 2,526
Likes: 104
From: Stafford Va
Well, here it is - just arrived today. 
Only thing is this... I noticed some small cracks at the back of the housing (you can see them in the front and closeup shots). 
Are these normal for a reconditioned housing or should I send 'em back and get a replacement?
Front (notice cracks in back)
Second Front shot
Back
Left Side
Right Side
Top
Those cracks I was talking about
Only thing is this... I noticed some small cracks at the back of the housing (you can see them in the front and closeup shots). Are these normal for a reconditioned housing or should I send 'em back and get a replacement?Front (notice cracks in back)
Second Front shot
Back
Left Side
Right Side
Top
Those cracks I was talking about
any chance to repost the pics, I just leaned up my housing and I have what looks to be a hair line crack
Thanks
Last edited by vstol; Apr 24, 2014 at 11:00 AM.