The other axle/wheel is sort of just there, cruising along not really doing much of anything, almost like a training wheel. The driveshaft mates to the rear differential, rotation is changed and fed through just one axle/one wheel. Open: Pretty simple to grasp and found often in lower horsepower applications. On “our” cars, there are essential two different types of rear differentials – limited slip and “open”. To keep it short, I am going to generalize a little here. As I mentioned, most of you readers are rocking a HEMI engine or at least a RWD Dodge hot rod. At the end of the day, however, they all convert the rotation of power from the driveshaft into a perpendicular rotation to turn the rear wheels. There are many types of rear differentials out there that have special features or do things slightly different or have a different method of operation. Something must take that rotational power from running longitudinal down the driveshaft and change direction of it so it can turn the rear wheels. It doesn’t take much to notice that your driveshaft runs from the front to the back of your car, and your axles run side to side. It’s pretty simple: Your engine turns your transmission, which turns your driveshaft, which turns the rear end, which turns the axles, which turn the rear wheels. Changing the fluid is incredibly easy and you really don’t need to have an engineering understanding of the pixie dust inside the rear end. It wouldn’t hurt to make sure you have good fluids in your rear diff just like you would engine oil. And at the track, and in empty parking lots, and anywhere there is pavement. All you HEMI ® engine-powered vehicle owners out here, I know EXACTLY how bad you beat the heck out of your cars. You may notice your SRT Hellcat owner’s manual may not say much about scheduled maintenance. But it might be smart to stay on top of your maintenance and tune-ups to keep things performing their best for the entirety of your vehicle’s existence. The ZF rear ends in Dodge Brand vehicles are strong as an ox and require very little upkeep over their lifespan. Most rear-wheel-drive (RWD) performance cars these days feature a limited slip differential. How many factory transmissions and rear ends are out there taking over 1,000 horsepower straight to the guts and standing strong? I’ll wait while you think about it. Especially on the SRT ® Hellcat versions. Right around 2015, Dodge switched from using the old made-over Mercedes Nag1 5-speed automatic trans and Getrag rear differentials and put in the beautiful ZF 8-speed transmission and matching ZF rear differential. Lucky for us owners, Dodge has given us a wonderful drivetrain in our modern-day muscle cars.
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