It feels like someone is hitting me from behind when it downshifts from I believe 2nd into 1st gear. Its a hard down shift. I was told by a mechanic at Bavarian Auto in Bakersfield Ca. His name is Sal and he is the owner. I told him when I took my car in that I wanted the transmission fluid changed. He told me it’s a lifetime transmission and it never had to be changed. Now I’m pretty sure I’m having a problem with my transmission because of it needing the oil changed.