TRNW-2: 850RE, 1-2 issue

[pat schulte]

Thank you all, thanks Dan. This has me buffaloed, I haven't had any issues
with otter ZF8s, but the 850s seems to be an issue. I may try a VB, but
I can see nothing wrong with the original so it is hard to pull the
trigger on a VB. $$$

On Wed, Feb 26, 2025 at 6:29 PM tucker tuckertrans.com via trnw2 <
trnw2 at trnw.net> wrote:

> Pat,
>
> I would be wanting to try a VB if I were you.  Is it possible that it's
> taking off in 2nd?  A 2nd gear start might trip a 1st gear ratio error.
> The bummer part is the PIDs even on the WiTech STINK on this unit.   I have
> 85RE band new in the box valvebody in stock if you are desperate, as I know
> they are VERY hard to come by.  It has to be programmed also.
>
> Dan Tucker
> ------------------------------
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of Fred
> Whitaker via trnw2 <trnw2 at trnw.net>
> *Sent:* Wednesday, February 26, 2025 4:18 PM
> *To:* Chris and Cathy Kershaw <kershawservicesllc at gmail.com>; Technical
> Discussion Forum <trnw2 at trnw.net>
> *Subject:* Re: TRNW-2: 850RE, 1-2 issue
>
>   My thoughts are throw a valve body at it,which I'm sure you have already
> looked into.  Googling tells me used ones are almost as much as a whole
> core,which sort of says they are having valve body problems. They sure
> ain't cheap.  I'm also sure you have already tried it,but are their any
> adapt resets?
> ------------------------------
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of
> Chris and Cathy Kershaw via trnw2 <trnw2 at trnw.net>
> *Sent:* Wednesday, February 26, 2025 3:38 PM
> *To:* Pat Schulte <zzyzxpat at gmail.com>; Technical Discussion Forum <
> trnw2 at trnw.net>
> *Subject:* Re: TRNW-2: 850RE, 1-2 issue
>
> First thing that comes to mind is software updates, second would be valve
> body wear.
> On Wed, Feb 26, 2025 at 4:28 PM Pat Schulte via trnw2 <trnw2 at trnw.net>
> wrote:
>
> *Date:* Wed Feb 26 13:28:31 PST 2025
> *Subject:* 850RE, 1-2 issue
>
> 850RE out of a Dodge, actually 2 of them that I built that seem to have
> the same issue, but since I only have one of the vehicles here, I will
> discuss that one. The vehicle will attempt to make a 1-2 shift, it feels
> like it may change ratios for a split second then will command back to
> first and set a 1st gear ratio code, after that no further gear changes.
> The only things that happen on a 1-2 shift is the C clutch comes off and
> the E clutch applies. This unit has new C and E drums, they are correct
> size, proper clearance, they will aircheck tight through the shaft and when
> assembled, aircheck through the case. A scanner movie shows the C solenoid
> coming off and the E solenoid coming on at the proper time. I have
> confirmed by my own pics from last year and also from ATRA pic, the VB is
> correct. It has the white and orange solenoids which I cannot test, but I
> swapped solenoid positions which changed nothing. I have been into this
> unit twice and can find nothing wrong. The E ! drum was stripped when
> originally built. I am concerned that I maybe have built something into
> this unit but can find nothing. Any thoughts would be appreciated, sorry
> for the long post. Pat.
>
> Pat Schulte
> Aamco Transmission Temecula
> Temecula, California USA
> TRNW Member Since: 4/11/2008
>
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-- 
Pat Schulte
AAMCO Transmissions
Temecula, Ca.
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