I have a sub 300,000 mile ‘04 3500 5.9 HO with a stock 48re. I live in Utah and recently it’s been getting pretty cold here and thus starts my issues with the tranny. Typically my 48re OD locks up at around 50mph when driving normally, not going up a hill, or throttling it hard. But, whenever the truck is cold or tranny is below about 140 degrees, it won’t lock up. It’s really irritating and concerning since I typically have to get on the highway going 70mph+ after only a few miles of driving. I always let the truck warm up about 15 mins or to 100 degrees for the ECT before driving and then 180 degree ECT before driving hard. The issue I’m seeing is that my 48re won’t lock up until 50mph or at least 140 degrees trans temp. So I’m usually stuck going 65 mph on a 70 mph rated highway at about 2500 rpm sucking all my fuel and feeling like the transmission is gonna explode. Anyone have this issue or a remedy for it? I don’t have a lot of knowledge concerning the mechanical background of a diesel but any info would be great as it’s only going to get colder. Don’t know if a NV5600 would be the better choice because right now I’m really wishing it was a manual for this reason. Thanks guys!
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