With normal driving there is no leakage. When it happened the first time, after topping of the fluid, sitting there 30 minutes or so for someone to bring me transmission fluid, & unhooking the trailer, it took about 2 miles before all the fluid smoke stopped ( I think it was just the remaining fluid from before I shut it off). When I got home 30-40 miles later the fluid level seemed unchanged.
I was able to reproduce the leak & smoke but only by pulling the trailer up a 2 mile grade just steep enough the truck downshifted to 3rd while holding the throttle steady and getting trans temp to 195 degrees.
I was able to top the hill, let the truck up-shift back to overdrive, temp fall back to 180 and finish the 8 mile trip back home without any more smoke or fluid loss.
I have checked closely and the fluid is coming from inside the bell housing. It is not coming from a trans vent or the dipstick tube.
Saturday, January 4th, 2014 AT 5:55 PM