Let start out by letting all of you guys know that i have two car. My first car was a 93 civic with a gsr swap. I just bought MY00 S2000 about two week ago. I decide to go ahead and change the oil, tranmission fluid, and the rear diff fluid. well i picked the GM Syncomesh for the Tranny. I put almost two qt. into the tranny. Went on to the rear diff. fluid. put mobil 1 75w 90 on it, almost 1qt in there before it started to drip out. After that the oil change was done without a problem too. i feel happy about what i did. I took out my 18s and put back on my stock wheel to park for the winter. well after everything was done. i started up the car for about 10 minute to check for any leak. No leak. looked great. on the test drive, the car was warm already. but then the shifting feel wrose then before. and when i was on the high way, the car shake. so i figure it was to stock wheel. took it to a tire shop to air up the tires to 35psi because there were at 22psi. and on the way there. i feel like my rear diff. wasnt running smooth. so now my question is 75w 90 the wrong type for my rear diff. The honda dealer told me that its soppose to be 80w 90. but i found someone saying 75w 90 so yeah; that was why i put those on. And everytime i turn. i feel like my rear diff is going to slip away like a broke axle. so i took the car home and parked. i need some help fast. i dont want to drive it more because i dont want anything to break. the car has 98900 mile on it. Please help if you could.

updated: well its was because of my tires blance was off. but now all is fix. so no more worry. thanks for all the help.

 

I use that Mobil1 75w90 gear oil so thats not your problem.

 

I use Mobil1 75w90 also.

 

i have mobile1 75w90 + lucas...

 

huh. maybe i should look into the tires again. maybe it could just be the vibration on it. thanks guy for the given info.

 

yeah, i used the gm syncho fm in mine too, same amount. also 75w90 in diff, same amount. sorry, something else is messed up.

try dismounting then remounting all the wheels, and torque them correctly (i do to about 90ft/lb.) my friend's car shook, but redoing the wheels helped.

 

Maybe you just need to have the wheels balanced.

 

I agree ..... but also check the wheels and ensure they are installed on the lugs correctly.

 

will try back on my 18s to see how to car feels like. i tq them down to 80lb. with the oem lug too. but i will let you know how its goes..

 

i might just put back on the 18s to see how it goes.