I will describe as best as I can. You know when you drive over the rumble strip on the edge of the highway, this is exactly how the car feels. The vehicle was well maintained and I’m the original owner. A little history, I was rear ended a few years ago multi car accident and I was the first vehicle the Mercedes C300 behind me was totaled. I only felt a little bump to be honest. The rear bumper had some damage as well as the quarter panel and a flat tire but no damage to the rim.
I think a short time after is when this started but not right after. I’m thinking that the rear diff was damaged, but I’m not sure how the car feels or what does it do when the diff is going bad. The oil in the diff was changed every 30k. The engine and the transmission seem to be fine. This shudder hits around 40 and sometimes at 60 and it is an awful shake and when I let off on the gas it goes away and sometimes comes right back. Some days it doesn’t do it and then some days a lot.
Ive been to a Honda forum and they were clueless. I’ve been on this site for a few years and I know there are a lot of knowable people on this site. Also, the tires and brakes are new.
Thanks for your input.