I recently changed the trans filter and fluid on my 2002 Concorde. Now it seems to make a whining noise when I first start the car and put it in gear. It's worse when it"s cold. I used ATF+3 on the advice of the auto parts guy. Would this cause the noise? It shifts well and there are no other complaints than the whine, but it didn't do it before I did the change.
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The most common whining noise from that tranny is the transmission pump. Sometimes they have a high pitch whine noise yet nothing wrong its normal. Sometimes its an indication of the pump being over-worked due to a dirty filter or fluid low. Turn engine on and check tranny fluid level. If low add to cold mark on dipstick, check for leaks under vehicle. If fluid appears very black or burnt smell, recommend flushing fluid and replacing filter (located inside tranny pan) yours will be a 4L60E type tranny.
Those metal flakes are normal wear and tear within the trans. You may try having it flushed (this may/may not work), The transmission may need a rebuild if you have serviced it already and is experiencing the same issues...hopefully this helps
if you never changed the trans fluid yet, don't
the shavings that are worn mixed with the trans fluid must be retained in your trans to keep the trans shifting smoothly
I have seen plenty of people changing there trans fluid for the first time with 50,000 miles then the trans will slip
If the trans has a whine and shifts a little hard then you need to take if to a service center and have the trans flush and filter changed this might correct the problem. But if you have never had the trans fluid change and have 100,000 on it trans might be going bad. Trans fluid and filter should be changed every 40,000 miles.
the whining noise you hear is the pump in your transmission sludge builds in the trans pan it stops the filter up pull the pan off your trans you will see the sludge you probably need a new transmission.
there are several issues that need to be addressed. I imagine that the trans oil and filter have not been changed in a while so that is a first step in fixing the problem. trans oil and filter should be changed every 50,000 miles for atf oil and 75,000 for synthetic oil. old trans oil and clogged filters are #1 reason for trans slippage. another reason is the trans controle cable is out of adjustment and there fore the trans doesn't shift like it should this is something that needs to be looked at by a mechanic. third possibilty is either the check valves inside the trans valve body are gummed up or you have a failing torque converter. try and get that oil and filter changed and see if this helps solve it if not than you need to takeit to a shop and have the trans rebuilt.