rear end swap, weird noise?

[carisma43086]

Hi, i have a 97 3.8L and i swapped my stock open differential with a posi out of an ss. also switched to 3:73 gears. the problem is when i back off the gas i get a weird whining type of noise? has anyone had this problem? can u offer any advice as to what it might be and what to do about it?

[hockeyman]

May be the pinion bearing telling you something. I had a 86 T/A with just the opposite problem. It would whine as I was accelerating, and go away on deceleration. The mechanic told me it was a pinion bearing going bad, and fixed it for me at the cost of $250 :eek: and this was back in 1992. I don't want to guess how much it'll cost now.
Good luck though.

-Marc

[FireShadow]

That happened to my car....it was very unfortunate. It was the pinion gear coming loose, it lasted to within sight of a transmission shop and WHAM! Ate up the whole rear end...... DEFINATELY have it checked out.