TRNW-2: 2017 6r140 diesel trans temp

[Fred Whitaker]

 As was said the aux coolant tank is first place to look. I have had 3 come in overheating that took around a gallon to top off,which is about what I believe the aux cooler holds.  I could find no real leaks on any of them.  No one ever checks the aux level,and they don't have a level sensor (which they certainly need one)!
________________________________
From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of Justin Merritt via trnw2 <trnw2 at trnw.net>
Sent: Friday, October 3, 2025 3:11 PM
To: Technical Discussion Forum <trnw2 at trnw.net>
Subject: TRNW-2: 2017 6r140 diesel trans temp

Does anyone know what normal transmission temp should be for a 17 f250 diesel 6r140?

I have a new job show up today, and customer states temps run 230ish on 2 lane roads 50-60mph. If he runs interstate normally around 220.  He says trans works just fine, but he is concerned of high temps.

Justin
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