Rear diff oil change/check

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504DusterIR

504DusterIR

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Hey how are y'all doing, I was going to check my rear diff fluid an possibly change it but I'm having a problem. I have watched videos on how to check an change fluid but the videos show there a plug you pull but I don't see a plug in mines I did see this squared shape bolt in the side ,just trying to make sure this is it before I unbolt something I shouldn't thank you any advice would be great

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The square plug you see is where the gear oil goes when its filled. To drain the oil the rear diff cover needs to be removed by taking all the bolts out holding the cover on.
 
Fill it until the oil just starts to dribble out of the square plug hole. Don’t forget the limited slip additive if it has limited slip.
 
Ok ..I'm not sure if it has limited slip, how would you tell
 
504DusterIR said:
Ok ..I'm not sure if it has limited slip, how would you tell
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Jack it up and spin the tires if they rotate opposite of each other it's an open diff. It they spin the same direction it's limited slip, sure grip or posi or whatever term you want to call it.
 
I personally prefer the pull the cover and drain method just so I can inspect the diff. And clean it out before adding new fluids. But the pumping out method works well too.
 
Dartfreak75 said:
Jack it up and spin the tires if they rotate opposite of each other it's an open diff. It they spin the same direction it's limited slip, sure grip or posi or whatever term you want to call it.
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In neutral.... and spin by hand. (Both rear tires off the ground)
I agree with above. Pull the cover off to change the fluid, and find out for sure whether limited slip or not. (If you don't already know otherwise... 95% chance it's open.)
 
I think it's open , I did post here before about finding out if I had posi , did a burn out an only the right rear tire smoked
 
33IMP said:
In neutral.... and spin by hand. (Both rear tires off the ground)
I agree with above. Pull the cover off to change the fluid, and find out for sure whether limited slip or not. (If you don't already know otherwise... 95% chance it's open.)
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Yes! This is what I ment. Thanks for clearing up my post!
 
504DusterIR said:
I think it's open , I did post here before about finding out if I had posi , did a burn out an only the right rear tire smoked
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Dartfreak75 said:
Yep it's open then.
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There IS a small chance that it is a cone sure grip, with completely wasted cones.... but that's maybe 1%. And that one percent is usually the guy asking..... "I've got a posi, how come only one tire spins?"
 
33IMP said:
There IS a small chance that it is a cone sure grip, with completely wasted cones.... but that's maybe 1%. And that one percent is usually the guy asking..... "I've got a posi, how come only one tire spins?"
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Very true
 
33IMP said:
There IS a small chance that it is a cone sure grip, with completely wasted cones.... but that's maybe 1%. And that one percent is usually the guy asking..... "I've got a posi, how come only one tire spins?"
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Awww man lol I hope im not that 1% , I was trying to find out in the past post if I had posi or not , so this come you speak about how would I tell ?
 
People have filled until the oil drools out the fill plug hole for decades, but that's actually incorrect and could lead to an overfill situation. The factory service manual has a spec for the quantity of gear oil to fill it with. That's what I would follow.
 
504DusterIR said:
Awww man lol I hope im not that 1% , I was trying to find out in the past post if I had posi or not , so this come you speak about how would I tell ?
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Im having an issue with my limited slip when my tires spin it always kicks me sideways I believe I have one side slipping more than the other. I got to dig into that eventually
 
Dartfreak75 said:
Im having an issue with my limited slip when my tires spin it always kicks me sideways I believe I have one side slipping more than the other. I got to dig into that eventually
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If it always drifts to the right, it's likely the road crown. Go to a parking lot and try it. It'll still probably drift a little but I bet it's a lot less.
 
RustyRatRod said:
If it always drifts to the right, it's likely the road crown. Go to a parking lot and try it. It'll still probably drift a little but I bet it's a lot less.
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It goes both ways tends to go left more violently when it goes right it's more controllable. If that makes sense




You see in the 2nd video how much I'm counter steering to try and keep it in the road and I eventually let out of it.
 
Dartfreak75 said:
It goes both ways tends to go left more violently when it goes right it's more controllable. If that makes sense




You see in the 2nd video how much I'm counter steering to try and keep it in the road and I eventually let out of it.
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I thought you looked familiar, I've watched your videos on YouTube
 
Dartfreak75 said:
It goes both ways tends to go left more violently when it goes right it's more controllable. If that makes sense




You see in the 2nd video how much I'm counter steering to try and keep it in the road and I eventually let out of it.
Click to expand...

Both of those were due to road crown. It drifted to the same side of the road.
 
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