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Message: <blockquote data-quote="stutaeng" data-source="post: 27824" data-attributes="member: 6175">Unfortunately, we don't have a (4L60e) transmission guru here, so I will try my best to offer advice:1. Start with the basics. Fluid levels okay? ATF and Tcase. Tcase are known to have fluid loss through the pump rub issue. Not uncommon for guys that just bought one of these truck to check and Tcase is dry.2. Has the transmission ever been serviced? You mentioned you just bought the truck, so I'm guessing you don't know on this?3. Check for codes. Many times you will have CEL codes being thrown if you have a mechanical issue. Try to get a mid-tier scanner that will also scan U-codes (for the transfer case). Also, these scanners will show live datastream, and you can see if parameter are showing up like turbine speed sensor RPM. Maybe you can determine where the powerflow is loss by doing so.4. Good idea to check driveshaft. Chock the wheels for safety.</blockquote>