The Universal Joint in Mercury Grand Marquis is used to link the driveshaft to the axle assembly thus requiring independent joint movement whenever the car's suspension cavorts to conditions on the road. This joint consists of a cross with needle bearings located in hardened steel cups; it enables the power to be transmitted while at the same time angling up and down in response to the movement in suspension. Generally, Universal Joints arrive at the purchaser pre-lubricated and U Joints contain grease zerks for relubrication. In the past decades the Grand Marquis has incorporated several types of U Joint designs mainly with reference to their strength and serviceability for ease of overhaul. Worn 'U' Joints are clearly for example described as making gear shift noise and vibration at speed, which suggest that it has to be inspected and possibly replaced. Due to the subject's exposure to wear through the use it receives periodically, the condition of grease seals and clips should not be overlooked as this determines the efficient running of the U Joint.
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