I could be wrong, but shouldn't we expect a little whine from a vehicle that has a mechanical LSD? I'm certain my '05 whines when it's cold.

 

None of my cars do.

 

Nor do mine, SE-R or M3

might want to change the fluid, perhaps to something synthetic

 

Do a quick search here and you'll find a lot of people who say their's whines.

 

just a little curious thats all cause if something is to go wrong i would not have the money to replace it thats all? after all i just pu a brand new factory rear end in my S

 

I had Rick's 4.56 and they were very noisy. They were also way too much with my current turbo. First and second hit redline in the blink of an eye. So I went back to a cryo treated stock gear set. No more whine. The 4.56 I took out had a perfect wear pattern on them, so I know they were installed right. I have heard other people who have used Richmond differential gears say that this is a common characteristic of them.

 

Fperra - everytime I see your sig I get jealous!

edit - I see you live in Addison. I live/work in Addison and would love to check it out and go for a ride.

 

In terms of gas mileage I think your only going to see the diff when you go on the freeway. I usually cruise around in 5th so going 45ish is like 3500rpms? I am not sure what 4.77's would put you around 45 but you can always just use 6th gear while cruising the streets.

Ive also read the whine is common for the 4.77's and the Rick's gear set, I dont think it will hurt if you take the diff apart and see if anything is out of place. After a year or so the gears should show signs of damage IF they were installed wrong.