This video shows you how to tell if your rear wheel drive car or truck has a limited slip differential, and also what gears it has. It is quick and all you do is read the tab on the differential pumpkin, or lift the rear and spin the tires... While moving one tire by hand, If the tires move in the same direction (or one doesnt move), it means that it is most likely a limited slip (posi traction) rear end. A limited slip rear uses a special additive to the gear oil when you do a gearoil change, and it is necessary or damage could occur. An open differential (like the one in the video) does not use the special additive and the tires spin in opposite directions when one tire is spun.

How to Change the Differential Fluid:    • How to change rear Differential Fluid...  

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Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.