Question about 2004 Lincoln Aviator

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2003 AVIATOR SHIFTS HARD FROM DRIVE TO REVERSE OR REVERSE TO DRIVE, SEEMS TO CALM DOWN ALITTLE ONCE THE RPM'S DROP BUT EVEN THEN SOMETIMES IT SHIFTS HARD

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A perception of a hard shift into to the drive or reverse gears can be due to a problem in the idle speed control system, the engine may not be fully warming up or doing so slowly, also excess play in the drive line can make this feel harsh, examples of the are a worn rear gear or bearings, this allows for excessive backlash in the differential and makes a clunk when shifted to drive or more often reverse being the worse of the two, have this done, have the drive-line checked for excessive play, this includes the transfer case (if 4 wheel drive) the universal joints and the backlash in the rear end gears, also have the transfer Case checked for a loose drive chain inside the case, there is a tool to check the play/slack in the chain, this can cause this harshness as well and is common "clunk" in 4X4's if all this checks ok have the engine idle speed control system tested and the engine cooling system thermostat checked to make sure the engine idle isn't stay a little to high due to a to cool running engine, this is very important, also have the system tested for active running problems, this is called a key on engine running quick test, a Ford/Lincioln dealer will need to do this test in most cases, all this can be very expensive, this slack that causes this noise will not get worse or will it cause a breakdown, left to me I would ignore it unless it is really bad, another thing that you can do is give the engine a few more seconds to slow down before engaging drive or reverse, I suspect reverse is the worst, this is what i have seen at the Ford dealer I have worked at for 25 years..

Posted on Sep 03, 2009

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Make sure the brake is on and the wheels are blocked and have a friend shift it back and forth while you look.
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Trans shifts very hard after 5 minutes of stop and go traffic


A reason for hard shifting could be a problem with many things with various degrees of seriousness. It could be your ATF( automatic transmission fluid) is low or broken down and old. This would cause the hardness and the reason for stop and go traffic effecting it. Another possibility is your transmission is just shot, and the timing gears inside are worn and not properly shifting at the correct RPM causing a **** during shifting.

Some possibilties, not all!

~Lucas

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just ram the shifter in your booty,.....duh

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