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What is cause of a brief squeak noise at 900 RPM when accelerating or in Park as raised. 1999 44 AT with 100K. sounds simaler to bearing only very short and goes away above 1000 RPM?

Squeaking Noise at 900 RPM in 1999 44 AT:

Potential Cause: Insufficient Transmission Fluid:

* Cause: Insufficient transmission fluid can lead to a whining, squealing, or grinding noise when accelerating or in Park. Fluid depletion compromises lubrication and leads to heightened wear on transmission components, causing noises.

Investigation and Solution:

* Check the transmission fluid level using the dipstick. If it's low, add the recommended type and amount of fluid as specified in the owner's manual.

* If the fluid is at an appropriate level, consider changing the transmission fluid and filter. Replacing old, worn-out fluid can rectify noise issues and improve transmission performance.

Note: This information is general advice, and it's always recommended to seek a proper diagnosis from a qualified mechanic to identify and address the specific cause of any noises in your vehicle.