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Transmission case condition

Forum: C3 Engines, Driveline and Handling

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Transmission case condition

Posted: 2/24/07 4:27pmMessage 1 of 4
w
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Joined: 12/10/2005
Posts: 81
Vette(s): 78 White/Oyster all original. Purchased from original owner
I started cleaning my transmission to do a rebuild.  As I cleaned it I noticed the case is very, very orange peeled.  The case looks like aligator skin.
 
The reason for the rebuild is because of transmission was leaking.  I thought it was traditional seals and gaskets.
 
Should I be concerned about porosity.  Or is the scaling normal? 
 
I have not finished taking the transmission apart so I don't know what it looks like inside.
 
Thanks
 
Tom
 
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Transmission case condition

Posted: 2/24/07 4:37pmMessage 2 of 4
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
I'm assuming you have an automatic. Some of the cases were really nasty when new. It has to do with the amount of leftover aluminuminum in the molds when the cases are cast. When the molds are clean, the cases come out super nice, and smooth. Once the molds build up a little "s l a g" on them, the outsides of the cases start to get really rough. It's not a problem at all, as far as usability, or functionality. It's all cosmetics.
(I hate handling those cases...they are so rough, they hurt my beautiful, dainty hands. )
There should be no issues with the porosity of the case, due to the molding s l a g. I've seen some that actually had pieces flake off, like a bit of oyster shell. It's still not a problem...they just look like crap. Not something you would want to put in a T-bucket, or show car, that's for sure!


Wow...when did "s l a g" become a derty werd? The software changed it!!Adams' Apple2007-02-24 16:46:40

Joel Adams
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Transmission case condition

Posted: 2/24/07 4:59pmMessage 3 of 4
w
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Joined: 12/10/2005
Posts: 81
Vette(s): 78 White/Oyster all original. Purchased from original owner
Thanks for the information. 
 
Your right a couple of thin layer pieces did flake off.
 
 
I will continue with the rebuild.
 
Thanks again
 
Tom
 
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Transmission case condition

Posted: 2/28/07 4:33pmMessage 4 of 4
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Waterford, MI - USA
Joined: 9/13/2002
Posts: 1795
Vette(s): 1973 Red coupe
One of the amin reasons I got rid of my TH400 was the pan area was real bad. The porosity was so bad that no gasket would seal for more then a couple of weeks. I have changed filters in many trans through the year and never had the problem I had with that trans. The guy I gave it to is still having the same problem with it. The only thing I didn't try was recutting the surface but thats all history now. Hope yours is a lot better then mine was.

Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans
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