TRNW-2: 8L90 Check ball controversy

[tucker tuckertrans.com]

Thanks Robert.  We just put it like the manual says (non-ESS=One Large ball and one small ball on the upper Vb).  ESS= 3 large balls and one small ball.
Dan Tucker

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________________________________
From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of Robert Moreau via trnw2 <trnw2 at trnw.net>
Sent: Thursday, November 13, 2025 5:44:43 AM
To: Technical Discussion Forum <trnw2 at trnw.net>
Subject: Re: TRNW-2: 8L90 Check ball controversy

Dan, we get that question someehat regularly. No idea why GM sometimes out one or both large balls that are needed for stop start units in non stop start units but they sure do it. It makes no difference if they are there or not on non stop start so it is not a problem, but is is indeed odd that they do that.

Robert Moreau
Lake Forest, CA
tranibob at gmail.com
Sent via Samsung Galaxy S24 Ultra

________________________________
From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of tucker tuckertrans.com via trnw2 <trnw2 at trnw.net>
Sent: Wednesday, November 12, 2025 7:14:52 PM
To: pat schulte <zzyzxpat at gmail.com>; Technical Discussion Forum <trnw2 at trnw.net>
Subject: Re: TRNW-2: 8L90 Check ball controversy

No Pat I sorry I wasn’t clear.  I’m talking about the upper valvebody that has the big balls.  It usually has 1 big no ESS OR 3 big balls with ESS.  These 2022 and 2021 had 3 big balls and it is not ESS.  No electric pump.  Then the other one has 2 big balls also not ESS.  I ASK ATRA and they sent me pictures that are from MOD AND spent help.  While I realize the ball could have worn out my point is they should have been in there to start with.  We are confused.  Which seems to be the normal quite often.

Dan Tucker

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________________________________
From: pat schulte <zzyzxpat at gmail.com>
Sent: Wednesday, November 12, 2025 6:55:00 PM
To: tucker tuckertrans.com <tucker at tuckertrans.com>; Technical Discussion Forum <trnw2 at trnw.net>
Subject: Re: TRNW-2: 8L90 Check ball controversy

Seen it Dan. I just put back whatever it had, not sure of the reasoning. I have also seen the lower VB with either 2 or 3 balls. It was explained to me that if it had the "cat eye" on the plate , it didn't matter whether the ball was there or not.

On Wed, Nov 12, 2025 at 2:54 PM tucker tuckertrans.com<http://tuckertrans.com> via trnw2 <trnw2 at trnw.net<mailto:trnw2 at trnw.net>> wrote:
Group,

We have seen this 2 times this week.  We are working on 2022 8L90 4.3 with NO ESS.  Both of these have never been worked on.  According to everything I seen it only takes 1 large check ball on the upper VB.  One of the units had 3 large balls and the one today has 1 large ball in the middle and 1 by the pump.  So does anyone know what the deal is?

Dan Tucker

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--
Pat Schulte
AAMCO Transmissions
Temecula, Ca.

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