xjbomber

97 xj country 4wd

I guess I will be removing the differential cover. Any pointers? Whats recomended for fluids? Do I need a gasket?

That Jeep Guy XJMJ

... gear oil, and some people use a gasket.. some people use silicon or RTV sealant...

I personally use a gasket... felpro typically.... make sure the surfaces are clean and some people don't think its necessary but i do a cross installation on the bolts when putting the cover back on.

xjbomber

should I buy the fluid at the Jeep dealership or can I just go to pick it up at Advance auto, any particular brand?

nickxj94

i run royal purple syntheic in both and just rtv sealant. it gives me a little better fuel milage and gears last longer..

That Jeep Guy XJMJ

cheaper to go with fluid from the auto store down the road and it works just as well.... Valvoline is what i run


the difference in the consistency of your gear oil has such little effect on your gas mileage that you would not be able to tell the difference... maybe... MAYBE fractions of a single mpg. It doesn't matter what you run if it be full synthetic or not full synthetic. As long as you keep up on fluid changes your gears will last just as long.

nickxj94

it may not but i like syn fluids lol even run syn in my engine, everyone has there own opinion this was just mine..

xjbomber

Is this what you use, how many are needed? seems expensive.

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Max-Gear-75W90-Royal-Purple_7070082-P_N3242_T|GRP2035_____

whats the best RTV sealant I can buy at advance auto. They have so many different options.

http://shop.advanceautoparts.com/web...p2HomeClicked=

beefmobile

I use mobile 1 oil and ultra black RTV. Works great and keeps a solid seal.

xjbomber

How many qts. should I buy?

xjsnake

Front takes 2.5 pints
Rear takes 4.8 pints (assuming you have an C8.25 rear end)

Any name brand 75W-90 will work.

If you have a Limited Slip Differential you will need to add 4-5 ounces of Friction Modifier in place of 4-5 ounces of gear oil.

nickxj94

it is a little pricy you can use what ever you want valvoline is great too i just like the purple stuff lol, i think 2.5 qts for front about 4 for the rear maybe a little less,rtv just get the red or orange for high heat..

xjsnake

Pints, not quarts. See my above post.

hidetheid

I miss not havin to pull the cover to change the fluid

92XJGuy

I have to change my differential oil too, and might as well to t-case while I'm down there. I haven't done this since I picked my Jeep up last year. I have a D30/8.25 combo, with an Aussie in front. Will any name brand 75W-90 be fine for front and rear? Then what is recommended for the T-case? Dex III? And then how much would I need all together?



Cheers!

LYKOS

Synthetics are awesome! And yes, they do help a wee bit with mpgs.

How long have you been running Royal Purple? How often do.you.change? I use Lucas.