My new 06 SCrew has a steering shimmy at 70 to 75 mph.I have the 20 in. stock Pirelli tires.Has anyone else had this problem?

 

i have the same problem in my 04 scab fx4 at around 70 mph but when i bought it bout 2 months back i had to put 2 new back tires on it an the tire place was suppose to rebalance the front tires so im thinkin it might be the tires are outta round

 

My 05 had 2 bad Generals. Took it to Ford and they replaced them free.