Tips on Buying a Differential Mount Bushing
The differential mount bushings are often the most common parts of the car's differential to be replaced. Constant exposure to heat and vibrations can cause the bushings to deteriorate. Replacing differentials will also require changing the bushings even if they appear to be in good condition. But whatever the reason, the bushings must be changed immediately or else the differential will not be mounted properly.
Luckily, finding a replacement differential mount bushings isn't that hard to find. In this guide, we will share some tips on buying a differential bushing for your car.
Should you choose OEM or aftermarket?
Both OEM and aftermarket differential mount bushings are widely available in stores, and each one has its own set of pros and cons. Replacement OEM bushings, which are made by the same manufacturer that supplied the original bushings in your car, are the safest choice for beginners. OEM parts are designed to fit and function as the stock bushing, so compatibility. However, OEM differential bushings are quite expensive compared to aftermarket ones and may not be available for older models. What's more, if the stock bushing is of low quality, replacing it with an OEM bushing may not be the best course of action.
Aftermarket bushings, on the other hand, are differential mount bushings made by companies not affiliated to the original manufacturer. The quality of these bushings vary wildly, with some aftermarket bushings made of poor quality materials to cut costs to high-performance bushings designed for racing applications. Also, they also do not have the same degree of compatibility as compared to OEM bushings. Either way, aftermarket bushings are usually cheaper than their OEM counterparts, making them a preferred choice by mechanics and insurance companies alike.
Rubber vs. polyurethane
Differential mount bushings are usually comprised of a steel outer ring and an inner core that's made of either torsional rubber or polyurethane. Torsional rubber is commonly used in OEM bushings and is known for being softer of the two. The rubber's softer cushioning properties often leads to less stress on the differential even when driving on uneven terrain, but it is also highly susceptible to degradation from a lot of factors including extreme temperatures and polyurethane.
Meanwhile, polyurethane differential mount bushings are commonly found in aftermarket bushing kits (although several cars today have stock polyurethane bushings) and are much harder than their rubber counterparts. While this leads to less vibration dampening characteristics, polyurethane bushings are much more durable and are highly resistant to the elements. This makes polyurethane differential mount bushings a recommended choice for vehicles that are often used in heavy-duty and performance applications.
Always check the part number
Whatever your preferences are for a differential mount bushing, you should always make sure that it is compatible with your car. Each car uses its own respective type of bushings which can be identified through its part number. If the part number of the bushing does not match that of the vehicle, it will not fit properly on the differential. So when buying a differential mounting bushing, make sure that the part number matches.