1999 Dodge Ram veh vibration when brakes applied

I got a 1999 dodge ram 2500 2 wheel quad cab drive 5.9L I recently replaced the rear brake shoes, wheel cylinders, brake spring kit, drums, now when i apply the brakes i have a vibration in the veh (there was no vibration in veh before replacing brakes) there is no pulling left or right, no brakes locking up, no shimmy in the steering wheel, no pulsing of the brake pedal. what i did notice is when i removed the rear shoes the linings were all the same length. i could not get those at my local auto parts store what could be my problem.