Rear diff question
Rear diff question
Hey guys, so i removed my transfer case about a week ago now. Just waiting on the replacement (shipped today w00t!). I have an '03 evo 8. All evo's came equipped with a locking rear diff correct? If that's the case, when I turn one wheel one direction with the car up on stands, the opposite wheel should turn the opposite direction correct? I'm a little confused, because when I do that, the other one doesnt move at all. But if I spin the drive shaft, both turn the same direction. Does that mean it's an open differential? I'm a little confused here. Help! haha
p.s. I searched I promise!
also, if it's an open diff, are there any reasons I couldn't run an lsd in the transfer case? That shouldn't cause any problems that I can see, because it would only affect the front wheels, but I would rather be safe than sorry.
p.s. I searched I promise!
also, if it's an open diff, are there any reasons I couldn't run an lsd in the transfer case? That shouldn't cause any problems that I can see, because it would only affect the front wheels, but I would rather be safe than sorry.
All evo 8s have a clutch type lsd in the rear. You can actually rearrange the disks to match the shop manual because they are out of order from the factory and don't grip as much because of it.
There are also options for locking or more robust rear differentials out there. It eliminates a lot of the understeer you get with the stock unit. I am actually in the process of pulling mine out because I managed to break it finally after 100k miles (not common).
As far as spinning direction goes, I am fairly certain open differentials spin wheels in the opposite direction when they are not on the ground.
http://www.howstuffworks.com/differential2.htm
That should be a good visualization. Basically shows you why both spin forward in the same direction when turning with the driveshaft, versus one of the wheels. Because the main ring gear is stationary when turning via one of the wheels, the pinion gears are doing the rotation so the other wheel will go the opposite direction. When spinning with the driveshaft, the main ring gear is doing the rotating so they both move as you would expect.
There are also options for locking or more robust rear differentials out there. It eliminates a lot of the understeer you get with the stock unit. I am actually in the process of pulling mine out because I managed to break it finally after 100k miles (not common).
As far as spinning direction goes, I am fairly certain open differentials spin wheels in the opposite direction when they are not on the ground.
http://www.howstuffworks.com/differential2.htm
That should be a good visualization. Basically shows you why both spin forward in the same direction when turning with the driveshaft, versus one of the wheels. Because the main ring gear is stationary when turning via one of the wheels, the pinion gears are doing the rotation so the other wheel will go the opposite direction. When spinning with the driveshaft, the main ring gear is doing the rotating so they both move as you would expect.
Last edited by fre; Feb 17, 2012 at 05:20 PM.
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