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

[pat schulte]

One thing to watch for as well, I have not seen anyone but the Transtec
piston kits have a new D "piston" All the others I have seen did not carry
it.

On Wed, Feb 19, 2025 at 11:02 AM Chris and Cathy Kershaw via trnw2 <
trnw2 at trnw.net> wrote:

> I just watched this transtec video using their tool. Looks to me like it
> could be done without the tool, maybe get an old piston to make a jig for
> drilling the rivets. We haven't seen but a few with gear ratio or other
> internal problems. The vb/tcms have been on intergalactic backorder
> everytime I check. Used units seem to cheap & plentiful.
> https://youtu.be/_npBS3W3dgI
>
> On Wed, Feb 19, 2025 at 11:47 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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-- 
Pat Schulte
AAMCO Transmissions
Temecula, Ca.
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