98 GT - whining transmission noise after motor mount replacement
 

98 GT - 116,5 K miles

When the car starts (mostly cold) starts, I start hearing this whining noise in the front like a supercharger noise. The noise gets a little bit louder when I accelerate in 1st and 2nd but it rapidly increases in pitch when past 2k rpm and when I get the foot of the gas pedal in 1st. I stop hearing in when I accelerate in 2nd and upwards, either because of the exhaust or it disappears entirely. After driving for about 10 min the sound becomes milder and eventually stops ( especially when idle while engine warm) What could it be?

It idles well. It does not cause any performance issues. The sound does not increase when I turn the wheel. This sound started after my visit to the mechanic. I replaced the transmission mount and motor mounts and put new caster camber plates. The transmission was not disconnected from the engine, the engine just got lifted a little bit to replace the mounts. Also, the bolts on the rear u-joint were tightened because they were very loose but the sound is coming from the front even in neutral.


I have a new t/o bearing (6 months old), the alternator is 2 years old. I believe the power steering pump is stock. I have not started troubleshooting stuff so I am just looking for some advice. After listening to the engine while warming, up I realized that the sound is not coming from the drive belt or the alternator. The power steering pump also does not make any sounds. The sound is the loudest near the firewall, I suspect it is coming from the bottom though I have jack up the car to double check. Once I again , I suspect it's the transmission but again it was not taken away from the block and I am trying to figure out how a motor mount replacement could affect the transmission. Any advice would be appreciated.

The only thing I can think of is the fluid is a bit low, but the trans mount was bad and maybe the fluid was sitting more towards the back of the tail and keeping that bearing lubricated, and now its more level so the bearing is whining a bit untill the fluid warms up and gets thrown up on it. Check the fluid level, top it off if needed or better yet just change the fluid out for new.