How To Change Rear Diff Fluid

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nvycrmn

nvycrmn

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dont you worry dgray. im hoping to have new gears put in next month. goin with some 4.88's i think. when i do that, i will put a locker in the rear.
 

panda24619

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panda24619

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so heres a question. i dont have a lsd. ive checked my book and the haynes manual. it says add friction modifier if i have the lsd. i dont. should i add it anyways? and my dad didnt buy the gasket. so i gotta go get it and an extra bottle of gear oil.
 
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you dont need the gasket, you can just get the RTV. as for friction modifier, i would just do it anyway. not going to hurt anything. its only a few bucks.
 

Extortion

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i didn't add any friction modifier to mine should i go back and get some?
 
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if you didnt use the fully synthetic (royal purple for example) then yes, go get a 4 oz bottle of friction modifier and put it in or you will destroy those gears.
 

99 Expy

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Hey guys, how many miles, or years do you usually change your diff fluid? I think my rear was done about 2 years ago when the seals were replaced, but I'm not sure about the front. I'm guessing there is a plug in the front?
 
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yes, there is a plug in the front as well. not as easy to do as the rear so hopefully you dont have to change the gasket on the front. i think its supposed to be every 60k miles for the fluid change. cant remember. i always do it after a good day of offroading in mud and water.
 

battmanf16

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this will save you about $40 or so from taking it to a shop. It just cost you $75 and about 1hr (drain time, wait time on RTV, and fill time) to do the same job that most places charge $110+tax.

This entire post is fantastic. It saved me many $$. The Ford dealership quoted $139 to suck out and replace the diff oil. To remove the cover and replace was $259 (which needed doing because of a leak). So, you saved me many more than $40. Thanks!

Bob
 

David C Bruner

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In case you don't know, at least Valvoline already puts a friction modifier in their 75w140 grease, so if you add more you may go from limited slip to never...
 
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