This may seem like an odd questions, but is it possible for the transmission fluid to run too cold after installing a cooler and bypassing the radiator? I did the tru cool 4588 and in VA winter, the gauge sits around 1/4 city driving and 1/8 on the highway at 80mph. I looked around and found some fluid temperature controllers that can be installed on the cooler lines and will open up at 180F.
Here's a pic of where I mounted it, it fit well behind the horns.
I would think so since it is not having the hot antifreeze from the radiator to warm up the fluid. Also, with it being cold in winter I bet you would not get up to temp unless you were towing.
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2004 Armada SE Smoke 4x4, 2 Degree Advanced Timing, Air-Box Mod, K&N Drop In Filter, Active Tuning Grounding Kit, 6000K HID's, LED Interior and Exterior illumination, Chrome OEM Grille, Front Windows Tinted To Mach Back, V8 Emblems, LE Emblem, Big Tow Package, Prodigy Brake Controller, ScanGauge II, Microfilter, Qx56 Chrome Wheels/Steering Wheel, OEM Fog Lights, Back-Up Camera!
1976 Apache Trailer Hard-side Pop Up