TRNW-2: AX4S, o-ring the o-drive servo pin

[pat schulte]

Ideally you would want an oring on both sides of the feed hole if the case
is worn. You would just need to measure to be sure it doesn't contact the
feed hole in the case.  I have the servobore kit to sleeve that bore I
could send to you to use and send back. I couldn't send until Tuesday, I
don't know how much time you have. I am in SoCal so it would probably take
5 days or so to get to you.

On Fri, May 23, 2025 at 9:27 AM Lee Hughes via trnw2 <trnw2 at trnw.net> wrote:

> Thanks Wayne, Fred and Pat,
> can you look at this photo and tell me exactly where I need to cut the
> groove?
>
> On 05/23/2025 10:06 AM EDT Wayne via trnw2 <trnw2 at trnw.net> wrote:
>
>
> Lee, I’d mimic the servo of sonnax’s 4r70 for the width and depth, and use
> that o ring. There are several width inserts, to cut grooves, and it’s
> quite easy to do. Do you need a pic of the holding tool and insert? (Only
> applicable if you’ve got a lathe).
> Sent from my iPhone
>
> On May 23, 2025, at 6:52 AM, Fred Whitaker via trnw2 <trnw2 at trnw.net>
> wrote:
>
>   I used to do this with a hacksaw as Pat said. I did it before we all had
> battery drills,and servobores.com.  Chuck the piston pin in a drill and
> put the drill in a vice and lock the trigger on (you now have a lathe,and
> something to steady your hands on).  You should be able to see on the pin
> where it has been riding on the case. Cut a groove just above the feed
> hole.  I used to use one of  those white 700 servo pin rings. (You will
> have to cut it to size) Cut the groove just deep enough to barely bury the
> ring.
>
> ------------------------------
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of Lee
> Hughes via trnw2 <trnw2 at trnw.net>
> *Sent:* Thursday, May 22, 2025 8:55 PM
> *To:* Wayne <wagarrick at yahoo.com>; Technical Discussion Forum <
> trnw2 at trnw.net>; pat schulte <zzyzxpat at gmail.com>
> *Subject:* Re: TRNW-2: AX4S, o-ring the o-drive servo pin
>
> Thanks Wayne, never done this before so trying to be cautious. where
> exactly on the pin does the groove cut go and how do you know how deep a
> groove cut needed? parts for these are getting scarce! thanks For any
> advice Lee
>
> On 05/22/2025 9:00 PM EDT Wayne via trnw2 <trnw2 at trnw.net> wrote:
>
>
> It’d be easy to do with a lathe and groove cutting insert.
> Sent from my iPhone
>
> On May 22, 2025, at 4:03 PM, pat schulte via trnw2 <trnw2 at trnw.net>
> wrote:
>
> I have cut oring grooves in pins before with a hacksaw blade or
> cutoff wheel.
>
> On Thu, May 22, 2025 at 12:57 PM Lee Hughes via trnw2 <trnw2 at trnw.net>
> wrote:
>
> *Date:* Thu May 22 12:56:45 PDT 2025
> *Subject:* AX4S, o-ring the o-drive servo pin
>
> Hello Everyone , I would like to add an o-ring to the 0-drive. servo pin.
> I looked everywhere for chuck stansy # to get in touch with him as he said
> he has done this several times any way has anyone else ever done this
> modification that I could ask a few questions to. The trans is in the car
> and I would like to avoid pulling it. Thanks have a nice day! Lee
>
> Lee Hughes
> Hughes Precision Automotive
> Martinsville, Virginia USA
> TRNW Member Since: 9/14/2007
>
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>
> --
> Pat Schulte
> AAMCO Transmissions
> Temecula, Ca.
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-- 
Pat Schulte
AAMCO Transmissions
Temecula, Ca.
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