Transmission noise?

I cant figure out what this noise is i accelerate to 40 mph then let off the gas and around 35 mph it happens for a couple seconds only happens when the car is in gear sounds like it could be front diff or input shaft bearing i could use some help!!!!!

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Transmission whining/grinding noise on a 97 740iL
UPDATE: Resolved the issue in June 2012 by performing a transmission fluid change, replacing the Febi filter the shop installed with a Genuine BMW Filtran filter. No noises at all in the last two months. Whining noise my 740iL makes when accelerating with a cold engine. Check this link on BimmerBoard with the correct fill procedure: http://bimmerboard.com/members/brian/original/ZF%205HP30%20Oil%20Change.pdf





HOW IT WORKS: Car Transmissions (720p)
This technology video describes how a transmission is structured and works. In physics, a transmission is a mechanical device that uses gears to improve mechanical efficiency, employing the ancient technology of the lever. Its a machine that requires a power source and a power transmission system, which provides controlled application of the power, automatically or manually. Often the term "transmission" refers simply to the gearbox that uses gears and gear trains to provide speed and torque conversions from a rotating power source to some other kind of mechanism, such as a differential, which would apply that power to the wheels. For more information on transmission technology, please goto: https://en.wikipedia.org/wiki/Transmission_(mechanics) HOW IT WORKS playlist: https://www.youtube.com/watch?v=4rIHdcwlvlk&list=PLCIsViWU6sLkATemOAURLlP0G K4-dyHRm FOLLOW on: https://www.facebook.com/documentarytube.net https://twitter.com/DocArchive





Transmission No Shift Case Study (P0888)
To learn more of testing procedures shown in this video, go to www.scannerdanner.com This is a 2002 Dodge Caravan that is stuck in second gear. This is known as limp home mode or transmission limp mode. In this video I cover the following: How to test a computer controlled relay How to do a loaded circuit voltage drop test How to determine if a relay is power or ground side controlled. How to test for an open circuit Why the computer enters limp mode P0888 Flow Chart Transmission wiring diagram overview Transmission solenoid power For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!





How a CVT works! (Animation)
This animation explains the basic principle of CVTs (continuously variable transmission). Here, we look at the Variomatic and the Multitronic. 1) Input shaft, output shaft, metal belt 2) Continuously variable RPM 3) Pulleys and sheaves 4) Cogged v-belt, metal belt, CVT chain 5) Variomatic with centrifugal weights 6) Use of hydraulic oil pump




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