Question about 2003 Buick Century

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Transmission When in normal operation trans shifts hard from gear to gear?

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Verify tranny fluid when engine has reached normal operating temperature. U know when u reach that temp when the coolant fans start.
Centuries have a weakness on the 2nd gear valve, but that doesn't seem to be ur case.
Check that and get back to me.

Posted on Sep 09, 2008

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Sounds like one of the vehicle speed sensors is bad. Either that or ABS unit might have a problem. Auto trans normally use the main speed sensor, but shiftronic/sportronic/etc. usually also use the ABS unit to monitor all 4 wheels to be able to make the best shift possible when you ask it to. So check sensor operation, wires and whatnot, if everything is fine, try to get a friend or someone who can do datalogging from OBD2 port to see if the sensor are being read correctly by the ABS and ECU. If readings in datalog don't seem right and sensors are all good, then you will know the ABS unit or ECU will need replacing.

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When going from park to reverse or drive it is hard or going back to park. I have to use a lot of force to get it into the right gear. Also one time it wouldnt go into park. I had it checked out and there...


Hi. this is a common issue with this dodge transmission design. there is an issue concerning the factory shift solenoids that are in the trans pan. First, make sure your tranny fluid is at a proper level, Once you have inspected the tranny fluid and filled to specs, i would next move on to a basic transmission flush and filter change as well.

Once the flush has been initiated, you should notice a deference in the shifting. If the shifting is still hard and not normal after the flush and filter change, this will confirm a more serious issue within the transmission itself. At this point, i recommend dropping the trans and taking a look at the transmission control module. test the module for its operational value and test all shift solenoids as well.

Please rate and god bless:)

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hi . yes you can add a tran cooler.and most cars have them. they are usely in front of the radeater.it would be a good i dear to chang the tran oil . and when you do add louc tran oil trement it will halp with the tran shifting ok.and heating up . good luck

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1 Answer

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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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I know you don't want to hear this but theis transmission has failed, the clutch pack for gears 3&4 has failed, the trans will need an opverhaul.

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