TRNW-2: 6t70 case condition

[Fred Whitaker]

 Yea,I had that problem years ago. I ruined more than one 440 case screwing up the accumulator bores., I was using Zep soap.
 But it can still happen without Zep soap if you let the parts washer go way to long.


________________________________
From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of jbockus--- via trnw2 <trnw2 at trnw.net>
Sent: Tuesday, January 21, 2025 10:35 AM
To: Chris Kershaw <kershawservicesllc at gmail.com>; Technical Discussion Forum <trnw2 at trnw.net>
Subject: Re: TRNW-2: 6t70 case condition

I've personally never had that issue in my shop but have built a few
units that have been rebuilt that had the gray tint to the aluminum and
it's caused from the parts washer water not being maintained properly.
It plays havoc on molded rubber pistons! I too use the Zep soap in my
washer and have never had problems with it, but we clean our machine
regularly too.

On 2025-01-21 10:29 am, Chris Kershaw via trnw2 wrote:
> Post ID: 21288 [1]
> Date: Tue Jan 21 8:29:13 PST 2025
> Subject: 6T70, 6t70 case condition
> We have a 6t70 here that was originally built by another shop,
> essentially with no warranty. Customer brought it here, we corrected
> several build issues and did all the usual work. Trans worked good and
> it left. It's now back for the second time with p0756 & a loose molded
> piston in the case. We decided to get another case after reading the
> fixes in the data base. Now I'm wondering what ruined the case. They
> don't look like this coming out of our cleaning machine. Top is the
> bad/old, bottom is the new/used. The customer owns tractor trailers,
> he said looks like polished aluminum on a big truck that was sprayed
> with purple power or zep.
>
> Chris Kershaw
> Kershaw Services Llc The Gear Box
> Mechanicsville, Maryland USA
> kershawservicesllc at gmail.com
>
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