Question about 2008 Buick Lucerne

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Shifts hard lower gear 2008 buick lucerne

From stop or coast when accelerating tran shifts hard

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

StormStrikes
  • 104 Answers

SOURCE: transmission sometimes shifts hard into next gear.

Typiclly this is caused by a failing Pressure Control Solenoid. Now in some cases, since you are in the 1996 model year you may have a vacuum modulator that controls the shift firmness that can be replaced as it is externally mounted. I dont know how best to describe what it looks like, but look down on your transmission, on the front side facing the radiator and if you see a canister like device that has a vacuum line running to it, that is the vacuum modulator and you could start by replacing that and see if it helps.

If you do not have the vacuum modulator and have instead the electronically controlled version of your transmission then you will have a Pressure Control Solenoid and it, unfortunately, is located on the inside of the transmission and cannot be easily replaced without dropping the whole transmission.

The pressure control solenoid is a common issue with your transmission (4T65) and Im leaning more towards you have the electronically controlled version (4T65E).

Posted on Feb 02, 2009

skidoorev
  • 11 Answers

SOURCE: 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

Posted on Mar 27, 2009

soc21610k
  • 215 Answers

SOURCE: 2004 Buick Regal. Hard tranny shifts.

Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems

Posted on Jun 02, 2009

  • 811 Answers

SOURCE: Buick LeSabre 2000 limited jerks when it shifts into a 2nd gear.

run scanner for trouble codes, some auto parts stores will do this for free, change plugs and wires

Posted on Oct 04, 2009

  • 7 Answers

SOURCE: cannot locate the battery under the hood

The battery in my 2007 Lucerne is under the rear seat. Just pull up hard on the fornt of the rear seat bottom.

Posted on Jan 12, 2010

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Does it down shift appropriately when accelerating? Normally when you stomp on the gas while in a high gear (travelling at 40mph), the transmission will downshift to a lower gear giving the car much more torque. This can cause the car to jolt or jerk forward and accelerate suddenly.



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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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The battery in my 2007 Lucerne is under the rear seat. Just pull up hard on the fornt of the rear seat bottom.

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