Dealership is telling me the whinning noise that I thought was coming from my transmission is actually a bad timing chain needing replacing on my 07 Nissan Quest that has 65,000 miles. I have never heard of one going out that soon. Does that sound correct and would that be under warrenty? They want $1600 to replace it.

Timing chain controls the valve timing and causes running issues. It sounds like the chain and or chain guides are bad and you should NOT drive it that way as you can cause much more damage. Get it fixed and you should be fine. If it is a high mile car have them do a complete inspection of the vehicle before you spend any more money so you know if there are more issues.

sound like transmission oil pump noise if you hear noise when vechicle accelerating moving.

Timing Belt or Chain? Just an idea, don't know what would cause a clicking noise in alternator. Another idea is the valves and rack, may need adjustment aka Running the rack

i would bite the bullet and trade it off on the other hand try another shop and get a second opion.

May be a bad bearing on belt tensioner or idler pully

you have a wheel bearing going out. see if it gets quieter if you turn one way or the other that will tell you what side it is on

Thank you for getting back to me. I would like you to check your transmission fluid. start the engine and let it warm up at idle speed for about 15 min and check the fluid. It sounds like you do not have enough in it, there for the whining noise with increase of speed since your transmission is speeding up with the rate of your vehicle. If this does not help and the problem persist please let me know. If the noise you were hearing was coming from the u joints of the vehicle it would not make a whining noise with increase of speed. The u joints will only make a noise when they are going bad when the vehicle is shifted into any gear from the shifter( EX: park to drive, park to reverse ECT.)

is the belt glazed? between age and miles it would be a good choice to replace it any way. i would also replace the tensioner. as far as the timing belt goes, i thought they suggested that one a 100k, but it sounds like a good price at least here in california.

That is correct. If your engine is whinning at about 2000 rpm's and its a high pitch whine, you need upper timing chains and chain tensioners. aka plastic gizmo as you called it. The timing chains ride off the plastic portion of the tensioner causing the noise, basically the chain is riding on steal stub from within the tensioner, that's where the noise is coming from. Waranree on this is 5years or 60000 miles which ever comes first. And the new tensioners are updated parts.

Get ready for a overhaul. Ask the transmission companies and they will tell you that us Dodge owners are their best customers. Your torque converter is getting toasted. You have about 10k before it goes. Sorry for the news. Got mine done and now at 213, ooo so it was worth 1700 to get it fixed. got an extra 60 k and going strong.