I took my 05 DC up a fairly steep 4x4 mountain trail the other day and about 10 minutes into the climb that i noticed a burning smell. I pulled the vehicle onto a level spot, kept the engine running and lifted the hood. I noticed a slight wisp of smoke and quite a bit of heat. I let it idle for a few more minutes and continued the climb to about 8,000 msl with vehicle rest breaks every 10 minutes or so. I did not get any strange sounds or overtemp lights. Also gauges were normal temps. Should I be concerned about the stress I put on the Transmission? Should I have it checked or serviced? I was in Lo 4WD during the climb.