Hi Mike, I'm pleased to assist you. When your 2007 Cadillac SRX vibrates every time you drive at 50-70 mph, it is most likely that your wheels are out of balance. The vibrations will emanate from the steering wheel across the seat and through the vehicle's floor. On the other hand, worn tie rods can make your steering wheel feel loose and cause degraded handling performance. You may also experience excessive "play" in the wheel and a much bigger dead zone where you can turn the wheel slightly before the car actually begins to turn. We suggest having the vehicle checked by a certified mechanic to determine what parts need replacements. If interested in this tie rod kit, use the link below to place an order while supplies last. Your order will come with a 30-day post-purchase price match guarantee. I hope this is helpful. Enjoy your CarParts.com online shopping experience! https://www.carparts.com/tie-rod-end/truedrive/set-repc282142-4?can=CPGG4850_CSQA_20221108