TRNW-2: ZF8HP45 (850RE & 845RE) P0733

[pat schulte]

Know that there are several of those repair tool kits depending on which
trans you have. You can repair without the kit but it's not fun.

On Wed, Feb 19, 2025 at 10:19 AM Mark Puccinelli via trnw2 <trnw2 at trnw.net>
wrote:

> Dan,
>
> Common problem. It's the 'D" clutch that is in trouble. Yes, complaint is
> on 3-4 but it sets 3rd gear ratio code.
> The drum has a riveted piston housing similar to very old Mercedes units,
> that housing fails. There are $1000.00 repair
> kits available for the drum, and I know off an alternate method of
> repairing the drum.
>
> Mark
>
> On Wed, Feb 19, 2025 at 8:46 AM tucker tuckertrans.com via trnw2 <
> trnw2 at trnw.net> wrote:
>
>> Group,
>> Does anyone know what the common cause of P0733 (gear ratio error in 3rd)
>> on the ZF845 is?  Many times it is intermittent and works perfect on a test
>> short drive but the P0733 comes back quite often.  We have put in about 5-6
>> used and rebuilt transmission, but have not rebuilt any for this common
>> concern.  We did buy a NEW 850RE valvebody and put on one that had 60,000
>> miles and it did NOT correct the problem.   It also seems like the
>> 2016-2017 are the most common years to see the code.  As for driving it
>> here is what's weird, is the transmission has a bad shift from 3rd to 4th cold.
>> It flares.  Reman units from Chrysler are around 2,900, so they are almost
>> not worth rebuilding, however now they are on backorder.  I find it odd too
>> that Jasper, Certified, and ETE have them listed as not available.  So what
>> are you guys doing, and what is the cause of the P0733.
>>
>> Dan Tucker
>>
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>>
>
>
> --
> *Mark Puccinelli*
> *Product Support Technician*
> *TransGo*
> *mark.puccinelli at transgo.com <mark.puccinelli at transgo.com>*
>
>
> *Adjunct Driveline Professor*
> *Skyline College*
> *San Bruno,CA*
> *puccinellim at smcc <puccinellim at smccd.edu>d.edu <http://d.edu>*
>
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-- 
Pat Schulte
AAMCO Transmissions
Temecula, Ca.
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