IRS Rear Diff Delrin Bushing

IRS Rear Differential Delrin Bushing

After searching for the cause of an ever-increasing driveline vibration over a year-long period, the culprit was finally identified. The rear differential bushing was gradually disintegrating. While on the car, the actual degradation of the rear diff bushing was difficult to see. However, with the use of a small pry-bar, excess displacement of the bushing was readily exhibited with relatively little applied force. With the bushing mount removed, the damage was immediately apparent. In this particular instance, the bushing was collapsed, nearly completely separated from the center sleeve and was shreaded in several places.

It should be noted that this bushing is NOT bonded to the metal bracket, thus allowing it to be pryed from the bracket once the bracket is removed from the chassis. It should also be noted that the entire pumpkin must be lowered to allow the bushing assembly to be removed. This requires pulling both halfshafts from the pumpkin and detaching the ABS sensors.

Rather than replace the failed bushing with another OE bushing that would likely fail at some point down the road, a Delrin bushing with aluminum center sleeve was fabricated. As a reference, the part number of the OE bushing is XR3Z-4B425-AA.

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