Hello Rene Figueroa,
50 is the perfect speed to get wheel shimmy from unbalanced tires & wheels... (even loose wheel nuts).
Mere wear, a lost wheel weigh or even foreign material in or in the wheels can cause balance... and some pretty good shaking...
Less likely but certainly more
PROBLEMATIC...
(when these get loose enough to cause "SHAKING" you are on the verge of a
SERIOUS FAILURE...
(
URGENT life-safety issues to yourself & others + $$$$$).
Any of your flex couplings in your front drive line...
Check the drive shafts first... EASIEST & most OBVIOUS...
Next check for any cracked or open boots (dust covers) at both ends of your "half shafts" (see parts below).
ANY free-play (bad thing)...
and possibly chocolate looking (iron-oxide) anywhee means you are looking at a U-joint or CV-joint replacement...
Not a tough job... just heavy & dirty.
The parts a suprisingly in-expensive (see below).
Hope this helps.
2008 JEEP COMMANDER 5 7L V8 CV Half Shaft Assembly RockAuto
More Information for 1 CARDONE 653007
http://www.rockauto.com/en/catalog/jeep,2008,commander,5.7l+v8,1441541,drivetrain,drive+shaft,2308
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