omgitsoop

just recently replaced my diff fluid with mobil 1 at 30,000 miles, bought the car with 20,000 miles so not sure if the fluid was replaced before. at first it felt smoother than before, but now shifting feels much clunkier than before, i can feel more while shifting than i would like to, and 3rd gear is giving me problems that ive never really had before. should i use something a little thicker? what feels the most like the stock diff fluid? am i just being a baby? you decide

blackout

The transmission and the diff are 2 totally different things. Perhaps the clunkiness but 3rd gear giving you problems should have nothing to do with the rear end. Sounds wierd to me, ever change the tranny fluid?

Rusted_nailz

To my understanding, changing the diff fluid would not affect how the tranny shifts. Unless you ment you changed the tranny fluid...

blackout

im changing out my fluid tomorrow and got the mobil 1 so i was hoping on some more input

omgitsoop

i didnt think it had anything to do with it either, it was just wierd how after i changed it if immediately felt different, so i thought maybe, but i guess not. i have honda mtf i just havent had the time to change it yet, probably this weekend and ill post how it is then.

replica

Mobil 1 in my diff, everything's jus fine

OCMusicJunkie

If you ONLY changed your diff and expected things to feel better, that explains why 10k later, the shifting feels lousy. Tranny fluid is what determines shift feel on our cars, and for *perfect* feel, it needs to be changed every 10-15k miles. Given thats about 3x more often than the owners manual suggests, and about 5x more often than people change it in most cars, but you WILL feel a difference with brand new synthetic fluid.

MitsukillinS2K

LE 607 is what i got in my diff and havent had any problems with it. im suprised i beat Fish22 to this post

chuhsi

Is this thread about diff fluid or trans fluid??

Mobile 1 in the diff is fine and I use it. 75w90.

90crvtec

This thread is stupid. You start it off by dissing a product that is in a part of your car that has absolutely no effect on the quality of your shifting. You then later mention that you didn't bother to change your MTF...hmm, I wonder if maybe THAT could cause clunky shifting? Ya think?

Now if your differential started making clicking sounds after the switch to M1 gear oil, then maybe I could understand your frustration. But trying to relate differential fluid to rough/notchy shifting is just stupid. That's like changing your transmission fluid and saying that your engine revs smoother.