civicsidude

I have a s13 and I just installed a j30 differential that I purchased from someone here. I used royal purple oil "almost 2 bottles" when I installed it the thing runs fine grips hard.

The issue is now i have a loud whine coming from that area that you can hear when ever you press on the gas. If i am coasting you do not hear it only when pressing on the gas. this noise is lound and i cannot figure out what it is. Any ideas would be appreciated.

1337240sx

shims in the diff not put in right?

civicsidude

thanks for the suggestion, i looked when I had the cover off and did not notice any shims added


the noise sounds like a honda transmission in reverse but just a little louder

Empire

wheel bearings going bad.

axels going bad

diff itself going bad

not shimmed properly.

tranny taking a crap on you.

those are the only things I can think of.

EfWorld

i have a welded diff that wines but its been doing it for 3 years now. when i first got it it was very loud. i changed the fluid (what came out was very clean) to a thicker lucas gear oil and it quieted down alot. still wines a bit

Empire

that's because it is welded.... I have never heard a welded diff that didn't whine...

1337240sx

mine didnt whine. drove on it for 2 years. but its one of the things posted in this thread...

civicsidude

Thanks for the input, replaced both axles last night no change I am going to swap it out with a open tomorrow and see if the noise is there. That should narrow it down some more.

EfWorld

lol it would be funny if someone welded it thinking it was an open diff

civicsidude

replaced with a open diff, and there is no noise so its def the j30. After searching around i noticed that are all j30s supposed to use bushings in the front to bolts?