Changed my rear diff oil today.

[ZMagnum]

I just got done changing out my rear diff oil. I used Mobil 1 synthetic 75w140. My Magnum only had 17,945 but according to the 2008 owner's manual you are supposed to check your diff oil at 18,000. I figured if I'm going to go through all the trouble of buying a 14mm hex bit, lift it and open up the fill plug I might as well take it one step further and just change out all the oil while I'm under there.

I didn't have any problem. Easy job. I drove the rear up on ramps and then put the front up an jack stands. I put a level under the car and it was perfect. I don't know how I did it. I guess I just lucked out.

I drained it and then I blew some compressed air in the fill hole. A lot more old oil came out the drain hole. I highly recommend this procedure with clean compressed air from an air compressor (canned air probably won't do anything). The old oil looked pretty good BTW. I guess 17,945 miles is probably too soon to change it but oh well.

I ended up using my oil transfer pump to get the fresh oil back in. I filled it until oil came back out and then quickly put the fill plug back in.

I didn't end up using any teflon tape as some have recommended. There wasn't any teflon tape on there from the factory so I figured it would be fine without it. No leaks so far. I tightened it to 37 ft/lbs.

When I first removed the fill plug it started dripping diff oil pretty good. I don't know how they fill it at the factory but it seemed a little high.

[ZMagnum]

While I was under the car I sprayed my bushings with silicone as well as the front rack boots and the rear CV boots.

I took the car out on the road and I swear it's got more power. I'm chirping 2nd in 81 degree weather and I'm lighting up the rear tires like crazy.

[Tdola]

Do you need to add the Mopar Rear Differential Additive to the rear differential when changing the fluid?

[Tbird100636]

Do you need to add the Mopar Rear Differential Additive to the rear differential when changing the fluid?

For 2005-2008 LX, no, because they don't have LSD. 2009's with LSD need it.

[ZMagnum]

I was just going to say that. I have LSD on my 2000 Durango and it needs the friction modifier additive.

I wonder if it's the same as what the 2009 LX's with LSD use?

[Tdola]

For 2005-2008 LX, no, because they don't have LSD. 2009's with LSD need it.

What about if I'm installing a Quaife (LSD)?

[Tbird100636]

What about if I'm installing a Quaife (LSD)?

Consult Quafire about this, the Quafire kit probably comes with a bottle.

[Tdola]

Consult Quafire about this, the Quafire kit probably comes with a bottle.

It came w/nothing but the unit itself.

[Tbird100636]

I was just going to say that. I have LSD on my 2000 Durango and it needs the friction modifier additive.

I wonder if it's the same as what the 2009 LX's with LSD use?

It appears to be from what I can see in the info I have.

[ZMagnum]

It appears to be from what I can see in the info I have.

That's cool. Thanks. At least my dealership is more likely to have it in stock.