Originally Posted By: roadrunner1
The fluid, according to the owners manual, is a lifetime fill, as long as there is no water intrusion. As long as the limited slip, if equipped, is operating as it should the fluid was more than serviceable. Most of these changes are to satisfy the owner, not the piece of equipment in question.
Glad you got the plug loose without damage to yourself or the truck.
I've heard two different opinions on the gear oil. Lifetime and change at 100k. It may have been changed when we had the tranny rebuilt at 40k but I'm not for sure.
Reason for the change:
Wife started noticing a vibration when she pulled the horse trailer. I had to tow a small excavator a couple of weeks ago and really noticed it (rear end was shuttering.) Also noticed it while turning at slow speeds. This truck sits 95% of the time and is mostly used for towing the horses around.
Upon further inspection, I noticed what appeared to be a very, very slow leak. I'm guessing enough had seeped out and was causing the LS to shutter. I was hoping it wasn't the tranny. Took her for a spin today and it seems to have corrected the problem.