My 06 has a little over 75K miles on it. I have been having this problem for about a month or so now. When I am driving, at random times the truck with feel and sound as if I am going over the entire road full of those rumble strips. I took it in the shop, told them about the radiator/tranny issue. They test drove it for a while and felt nothing. Checked the fluid and said it smelled funny. So they ended up replacing the radiator and flushing the fluids. I get the truck back yesterday and it seemed okay. Today the problem seems like it may be worse than before.
I am not sure but it seems like it happens when the truck downshifts but I am not certain on that. Any ideas, suggestions?
Thanks for the help