2012 4500 Chassis Cab 68rfe cooler upgrade? - Dodge Cummins Diesel Forum
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post #1 of 3 (permalink) Old 04-14-2019, 10:42 AM Thread Starter
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I just realized my mistake. It is the Aisin AS68RC trans. Did several searches but didn’t find exactly what I am looking for. I have a 2012 4500 Chassis Cab that I use for hotshotting pulling a 40’ gooseneck. I am looking for some options for better cooling on my Aisin 6-speed. I haven’t seen any terrible temps per se but I did hit 205 towing a shipping container through some slow winding, hilly, backwoods roads. Also seems I couldn’t get 2nd to lock up. Had to drop to first. Is that normal too?

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post #2 of 3 (permalink) Old 04-26-2019, 04:20 AM
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I've had more than one person tell me from firsthand experience the 11-12 trucks have a habit of running hot or issues overheating. One individual I know swapped the thermostat to a heavier duty towing one (??) and didn't have any further problems.

2nd not locking up seems to be a bit out of place, how many miles are on the truck? Issues with other gears?

1995 RCLB 2500, 4x4, NV4500, 4.10's, 4" FASS 95GPH, 202K.
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post #3 of 3 (permalink) Old 05-22-2019, 02:46 AM
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I just bought a RevMax thermal bypass that goes in place of the factory thermostat on the cooler lines. Made a massive reduction in temps. Your thermostat may have failed already.

2015 3500 DRW Laramie CCLB 68RFE 4.10 4x4. CM SS flatbed. Cooper LT255/70R17 ST Maxx and 2" Stahl Steel spacers. Thuren 2.5 springs/shocks. Carli track bar Mag-Hytec rear cover with 75/110 Amsoil.
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