Not sure why my 01 Kaiser's doing this... its only got 15500 miles on it.

When i let off the gas (red lite, stop, whatnot) and touch the brake, it revs a little high, almost as if it's searching for a gear, and then comes down to normal as it finds one. I understand this from previous posts to be the auto tranny switching from mechanical mode to fluid mode. Correct me if I'm wrong.

The problem is, as i'm coming to a stop w/ my foot on the brake, I can feel the tranny shifting from 4th... to 3rd.... and when it gets to 2nd I can really feel it -- as if I was in a manual transmission vehicle -- then when i'm almost stopped and it goes from 2nd to 1st gear, I REALLY feel it... i can feel the truck jerk a little, just like if I did the same in a vehicle with manual transmission. Sometimes I can also hear a single mechanical 'knock' as it goes from 2nd to 1st. Any suggestions? Have not checked fluids or anything yet -- been really busy. It IS due for a transfer case fluid change though... doubt that would cause this situation.

Thanks fellas....
Scuba