Search DW1 transmission fluid (or something in that line). You should find many posts.I've searched for a while and i know I've seen a post before but i cannot find it. Normal driving conditions, around 40-45mph the transmission will lag and grind making an awful noise. All i have to do is let off the gas or give a little gas to downshift and its fine. Can someone point me in the right direction please? Thanks.
The early Ridgelines came with a transmission fluid that was replaced by DW1 in later years. This fluid solves MANY problems (such as you described about the 40 mph "clunk" "grind" "lag").
If you have not changed to DW1, you will have to do multiple drain/fills to get the old fluid out.
As a side note... how often do you change the fluids in your truck (trans/differential, etc.)?