TRNW-2: 6r140 valve body and sonnax tooling

[Tod Chretien]

We did one in a cement truck that has been back 3 times with the 
converter clutch slipping. Each time another converter has fixed it. 
Factory converters to boot! I figured it was because they aren't 
standing the transmission up on end to install the converter, but it 
didn't look like the seal was damaged on the last one. It may be that 
the customer is simply hauling too much weight. The truck is loaded to 
the gills and they probably tow one of those asphalt rollers.

BTW: We also go with new Ford valve body on these and this truck got 
two. The second valve body didn't fix the converter slip (on the 2nd 
visit) so we went with another converter after not finding anything else 
wrong. On the last visit I recommended a pump and converter but I think 
they only replaced the converter.

-- 
Best Regards,
Tod Chretien
TRNW Inc.
https://www.trnw.net

On 12/30/2025 11:45 AM, Justin Merritt via trnw2 wrote:
> 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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