I am on my second ranger Supercab 4.0L 4x4 1st was an '01 now an '04 one was high mileage and one is low mileage. Upon starting out from a dead stop there are 2 noticable small bumps or jerks. I have tightened the spring shackles. I have had my hand on the motor mounts and noticed no problem. HOWEVER when it has been through a car wash or driving on a rainy day the bumps and jerks disappear and is as smooth as can be.

What in the world could this be?

Thanks!!

My only thought is possibly suspension bushings might be binding up, probably on the rear springs, try spraying silicone into the bushings, it might help.

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2002 Edge Super Cab 3.0, 2wd, air box mod ,3.73
L/S,Torsion Lift, 31x10.50x15 Tires, Leer Bed Cap