I have a 2011 Ram 2500 diesel. The manual states that the front drive shaft needs to be lubricated after every oil change. I have searched the internet, looked at posted you tubes etc...and then been under my truck to try and find the points where I can insert the needle point to lubricate the u joints...they are simply not there. The shaft is clean (no mud etc...). Is it possible that my model of the truck has a front wheel drive shaft that does not require periodic lubrication?