Buick Rendezvous Transmission Gear Selector

When I Am Traveling On The Interstate Going 80 Mph And I Have To Go Up A Hill The Car Shifts Into High Gear And Then It Jerks, It Is A Two...

I Just Got The Car A Week Ago And Had To Bypass The Anti Theft Security. Bought It From A Auction So The Gps Security Device Was Attached....

Between 3rd And 4th Gear It Don't Want To Shift But Does If You Let Up On The Gas.

While In Park Then Going To Shift The Car Into Gear, It Doesnt Go, So The Last Time This Happened I Got Out Of The Car And Rocked The Car...