Just wondering how often you guys change certain things.. Universal joints, manual tranny fluid, rear end fluid, Transfer case fluid,etc,, And what other things and intervals you use.. I just replaced all the u joints and fluids in my truck and people said it was a waste.. the u joint shop said the joints were fine can go for 100k plus with out worries ? I figured better safe than sorry.. ?? The truck only has 65K miles on it but pulls a 6500lb trailer every day, plus if it has clippings in the bed .... Thought it was reasonable preventitive maintenance.. What do you think ?