TRNW-2: 6r140 valve body and sonnax tooling

[Justin Merritt]

I justify one reamer set up for every overpriced valve body that I can
save.  The valve bodys are 800+ now, so if I buy a reamer set up for 500,
then that justified itself instead of buying the valve body.  Reamers
dont fix the solenoid issues on this particular transmission also.  So I
have to take into account replacing certain or every solenoid also.  I've
got 2 farm trucks here from the same farmer both needing transmissions.  So
in my mind, buying 2 reamers over valve bodys would make sense.  Looks like
sonnax makes a reman valve body for these that I can get.  They are cheaper
than ford OE, so that is a route i am looking at also.  It would be nice to
know if the sonnax reman has all the oversized valves already installed,
but they don't tell you that.  I guess I could buy one and take it apart to
see what they are doing.  And do a little vacuum testing on my original.

Justin

On Wed, Dec 31, 2025 at 7:14 AM Steve Everett via trnw2 <trnw2 at trnw.net>
wrote:

>   I think you'd have to see a lot of these units in order to justify the
> cost of all the reamers necessary,  the reamers are extremely expensive,
> I've only ever built 2 or 3 of these units,  some parts of the country
> obviously they would be more popular in , probably around the oil fields
> and similar areas .  but the investment in reamers would be prohibitive in
> my mind !
>
>     Steve
>
> On Wed, Dec 31, 2025 at 6:47 AM Fred Whitaker via trnw2 <trnw2 at trnw.net>
> wrote:
>
>>   Just a "Bump" for Justin. I too am wondering if anyone has a better
>> Mouse trap. I have fixed a number of these by just slapping on a Ford valve
>> body ,never really looking into just what might be causing problems. I have
>> always leaned towards blaming solenoids with no proof.
>>  Looks like Transgo still has nothing. Not much to the Sonnax Zip kit. I
>> have my doubts about their Oringed end plugs they seem to put in EVERY Zip
>> Kit.
>> ------------------------------
>> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of
>> Justin Merritt via trnw2 <trnw2 at trnw.net>
>> *Sent:* Tuesday, December 30, 2025 1:45 PM
>> *To:* Technical Discussion Forum <trnw2 at trnw.net>
>> *Subject:* TRNW-2: 6r140 valve body and sonnax tooling
>>
>> Hello all,
>> I am starting to see more and more 6r140s hit my bench.  I am comfortable
>> with working on them with great success.  I have always just replaced the
>> valve body with a ford OEM, but it seems these valve bodys are getting
>> priced to where I may need to look at repairing them vs replacing them.  I
>> do not mind investing in sonnax tooling that is needed to fix
>> transmissions.  However, I don't believe in needing to ream and oversize
>> every valve just because there is something available.  What are the high
>> wear areas that will need to be addressed if I decide to tool up and repair
>> these valve bodys?
>>
>> Thanks Justin
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