Hello all, i realy need your opinion...after a rebuild of the GM 5l40-e (torque converter and all clutches package) i remained with a very strange noise coming from the transmission area. When oils are cold i have a noise (like the wind under the door) wich i hear also when the car is roling at 60km/h in neutral with the engine off. I hear it when i accelerate , also when decelerating/braking, but with different tones. Can you tell me what is this about ? I have changed the transfer box because the mechanic sayd that the problem was there, but it wasn-t...also the bush+bearing from the rear side of the driveshaft and the noise is still there. Now the mechanic that repaired the gearbox says that the problem is the front diff but i8`m not willing to change all my car-s parts because of the word "I think" . So , please give me some advices
PS. Here`s my driving short clip url , please rise the volume up
https://www.youtube.com/watch?v=fVCnQLVLNmM