i have a 06 3830 GST 4x4 that has developed a slight buck when going from N to F or R. It does it 3-5 times then stops till you have to change drives again. i did find i was a little low on hydraulic fluid even though i can not locate a single drip. i did not have anymore fluid to fill back to up, but i know someone's went through this and may shed some light in case that does not clear it up. Possible pressure sensor or anything. There is no sounds and the weekend before ran like new. i did change the filter about 2 months ago and replaced the fluid i lost then, but no issues till now.