Changing fluids in transmission

[ronald pantelas]

I have a butler truckmount with 15,300 miles on the 2007 gmc 3500 van. Someone posted to change the tranny fluid yearly. Is this correct? Should I also get the radiator fluid changed. Will be at gmc within next 2 weeks for inspection. Thanks Ron

 

[starrett]

Pay attention to the radiator. The brown crap that is stock GM will eventually plug the radiator. Replaced my raidiator at 38k miles, just out of warrenty on a 04. Butler is aware of this issue, but changing to a different type of coolant may void your warrenty on the van. Check with your GM dealer. As for the trans. mine developed a clicking and proved to be a torgue converter at about 40k, another 700 bucks.

 

[Chris A]

I think GM requires Dexcool for their warrantees, could be wrong though.