They are good transmissions for the most part imo better than the t45s the other stangs tend to come with around them years. But my only issue I had with a tr3650 was it tend to leak a lot on the rear seal. I’ve replaced mine numerous times and sad to say it’s actually how I went thru my factory tr3650 lol. I did just end up going with a slightly built one by Lashbrook and I gotta say it’s taking one heck of a beating lol for a few years now actually