So Im fixing to pass 20,000 miles from when I bought my truck from the dealer and Im curious about what fluids need to be changed and what kind of fluids you guys use. I just had the transmission fluid flushed right after I got it because we were trouble shooting some shifting problems which turned out to be the computers fault. Is there anything else besides the Oil/Oil filter, Transmission fluid/transmission filter/ Transmission pan gasket (I have a small leak also), and the rear differential fluid? Is the fluid in the differential the only thing that needs to be changed or is there something else? Also I have a small leak on the front of the rear axle. Its where the drive shaft connects to the axle. Could it be a seal busted or something similar. I looked around on autozone.com and I couldn't find the seal for it, but I dont know what its correct name is haha so I might have passed it up. Thanks.