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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Differential Noise
This was found to be the diff sheared some teeth off of the ring and pinion. Just had to get replacement gears and was good.

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Working of a Manual transmission is explained in an illustrative and logical manner in this video with the help of animation. Here the working of Sliding mesh and synchromesh transmissions are well illustrated. This video also explains the working of a reverse gear.

Bad wrist pin is causing piston slap (dull knock under load)
2005 Hyundai Sonata with G4JS 2,4 I4 engine developed a dull knock when cold under load. Bad wrist pin is the main suspect. The engine knocks loudly under load after cold start, especially if oil level is low (the lower the oil level, the louder the knock). The sound is similar to piston slap, i.e. dull, tapping knock, like a piece of wood is hitting metal in the 1,200-2,000 rpm range. Also the colder the weather outside, the louder the knock is. The noise is somewhat quieter if higher octane gas is used. The engine doesn't knock at idle, however it produces a diesel like clatter when idling at operating temperature. The knock fades away when the engine is hot, but a little bit of it still remains. Recently did a compression test with the following results: 13.0 - 12.5 - 12.5 - 12.5 kg/cm2 or 180 - 175 -175 -175 psi. Engine spec according to manual is 12.2 kg/cm2 or 170 psi. The knock doesn't go away immediately after the engine reaches operating temperature, but after driving maybe 20-40 minutes. Even if the engine warmed up until op temp before drving, the engine still produces very audible knock. However, if I warm it up for about 15 minutes (reaching the op temp), and the let it sit for 20-40 minutes, it doesn't knock that loudly when driving. At that time, temperature gauge might drop even below the first mark, indicating cold engine, but it stops knocking loudly.

The Basic Parts of an Automatic Transmission (Part 1)
Visit me at: This is part one of my front wheel drive (FWD) automatic transmission dissection video. In this video I cover the operation of clutches, bands, accumulators, clutch drums, the oil pump, the valve body, valves, check balls, seals and 'o' rings, as well as the construction and function of many of the internal hard parts of an automatic transmission. To be honest a rear wheel drive transmission isn't much different as many of the basic components are the same. I guess what I'm saying is that you could use the information in this video to have a basic understanding of a rear wheel drive automatic transmission also. It is just a basic overview of the main components. I don't get into theory and operation so much. Just the general operation and identification of the parts. I may make more videos on this topic based on the comments I get so feel free to ask questions and perhaps I'll answer them in a future video on this topic. There will also be a separate video on the parts and operation of the torque converter as well. When that is posted I'll post links below to that video. Part 2: Torque converter dissection: Discussion about this video: -the-basic-parts-of-an-automatic-transmission#50371 Stay dirty ETCG Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information.  EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video.  Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result.  Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy.