Has any of you used Dr Diff's complete center section? If so, did it have any whine or was it quiet? My existing rear end ( with only 400 miles) had noise so I had the gear set and bearings replaced and within 1500 miles it also developed noise (whine). The work was done by different shops. The second shop has the car back and has used 3 different gear sets and are not pleased with the noise. I don't know weather to spend $ 800.00 on an NOS gear set or $1400.00 on a new diff. I just want to stop the whine.