Why does my car shift hard after flushed transmission, new filter and synthetic fluid? Could I need a new modulator valve if so where is it located and how can I check it
SOURCE: Automatic Transmission
should be on the side of the transmission with a vacuum hose connected to it
SOURCE: 1995 buick century transmission trouble
Most likely causes is the OD shift solenoid or less likely the VSS
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).
SOURCE: 2003 BUICK REGAL TRANSMISSION PROBLEM.
This is a common problem on some GM cars. There is a pressure control valve in the side cover of the transmission that needs to be replaced. The transmission does not have to be rebuilt. You will need to get a side cover gasket also.
SOURCE: 2003 Buick Rendezvous Transmission Problem.
I would try changing the filter, I've seen some that should be changed every 20,000 miles. You might want to check for any DTC codes stored for the transmission. Auto Zone will do it for free. If there is a code that might point you in the right direction.
1. Add extra oil when replacing filter. After refill check oil level.
2. With engine automatic transmission operating temperature, shift through all gears.
Check fluid level in NEUTRAL and add fluid as needed.
3. 1984-1992 Models with command-Track, add 5 oz of 75W-90 GL-5 to shift motor housing opening.
TORQUES
Oil Drain Plug.....25 ft-lbs
Manual Transmission T176
Fill Plug.....15 ft-lbs
Drain Plug.....15 ft-lbs
Manual Transmission SR4
Fill Plug.....20 ft-lbs
1980 JEEP CJ-7 4.2L 6-cyl Engine Code [C]
CAPACITIES
Engine, without filter..........5.0 quarts[1]
Wix Filter..... 51522
Cooling System, Initial Fill..........11.0 quarts
Automatic Transmission, A904, 30RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, A999, 32RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, Total Fill
3 speed A999, 32RH..........8.4 quarts
3 speed A904, 30RH..........7.0 quarts
Manual Transmission, 4-SPD, SR-4..........3.0 pints
Manual Transmission, 4-SPD, T176..........3.6 pints
Differential, Front..........2.5 pints[3]
Differential, Rear..........4.9 pints
Transfer Case,..........4.0 pints
1. Add extra oil when replacing filter. After refill check oil level.
2. With engine automatic transmission operating temperature, shift through all gears.
Check fluid level in NEUTRAL and add fluid as needed.
3. 1984-1992 Models with command-Track, add 5 oz of 75W-90 GL-5 to shift motor housing opening.
TORQUES
Oil Drain Plug.....30 ft-lbs
Manual Transmission T176
Fill Plug.....15 ft-lbs
Drain Plug.....15 ft-lbs
Manual Transmission SR4
Fill Plug.....20 ft-lbs
1980 JEEP CJ-7 5.0L 8-cyl Engine Code [H]
CAPACITIES
Engine, without filter..........4.0 quarts[1]
Wix Filter..... 51258
Cooling System, Initial Fill..........13.0 quarts
Automatic Transmission, A999, 32RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, A904, 30RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, Total Fill
3 speed A904, 30RH..........7.0 quarts
3 speed A999, 32RH..........8.4 quarts
Manual Transmission, 4-SPD, SR-4..........3.0 pints
Manual Transmission, 4-SPD, T176..........3.6 pints
Differential, Front..........2.5 pints[3]
Differential, Rear..........4.9 pints
Transfer Case,..........4.0 pints
1. Add extra oil when replacing filter. After refill check oil level.
2. With engine automatic transmission operating temperature, shift through all gears.
Check fluid level in NEUTRAL and add fluid as needed.
3. 1984-1992 Models with command-Track, add 5 oz of 75W-90 GL-5 to shift motor housing opening.
TORQUES
Manual Transmission T176
Fill Plug.....15 ft-lbs
Drain Plug.....15 ft-lbs
Manual Transmission SR4
Fill Plug.....20 ft-lbs
Oilman
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Car wont downshift
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http://schematicsdiagram.blogspot.com/2011/12/car-wont-downshift-sometimes.html
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Shift indicator
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Third gear missing
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http://schematicsdiagram.blogspot.com/2012/01/third-gear-missing-and-engine-losing.html
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Vehicle has whining sound in gear?
http://technoanswers.blogspot.com/2012/01/chevrolet-silverado-has-whining-sound.html
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Hard to shift gears on Manual
transmission?
http://technoanswers.blogspot.com/2012/01/hard-to-shift-gears-on-manual.html
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Car hard shift at slow speeds?
http://technoanswers.blogspot.com/2012/01/car-hard-shift-at-slow-speeds.html
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Automatic transmission shift lever
hard to move on cold mornings?
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
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Gear shifts hard?
http://schematicsdiagram.blogspot.in/2012/02/2000-nissan-maxima-shifts-hard.html
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Vehicle noticed sluggish
delayed shifts while driving?
http://schematicsdiagram.blogspot.in/2012/03/vehicle-noticed-sluggish-delayed-shifts.html
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This will help.
Thanks.
http://repairhelpcenter.blogspot.in/2012/02/car-will-not-move-when-in-gear.html
----
transmission sticks in first gear?
http://technoanswers.blogspot.com/2012/01/mercedes-benz-transmission-sticks-in.html
-----
Transmission not engaging in first
gear?
http://technoanswers.blogspot.com/2012/01/mercedes-benz-not-engaging-in-first.html
-----
Vehicle only goes
in First gear?
http://howtobyme.blogspot.com/2011/11/chrysler-pt-cruiser-only-goes-in-first.html
----
Car is stuck in park
and the shift will not move?
http://howtobyme.blogspot.com/2011/08/car-is-stuck-in-park-and-shift-will-not.html
----
Engine will not go out of park mode?
http://technoanswers.blogspot.in/2012/02/2002-nissan-sentra-will-not-go-out-of.html
----
Car stuck in park?
http://technoanswers.blogspot.in/2012/02/nissan-sentra-stuck-in-park.html
-----
Car will not come
out of Park?
http://howtobyme.blogspot.com/2011/11/car-will-not-come-out-of-park.html
-----
Automatic
transmission will not go into high gear?
http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html
---
Car wont downshift
sometimes?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-downshift-sometimes.html
----
Transmission
will shift into drive?
http://schematicsdiagram.blogspot.com/2011/12/buick-park-avenuetransmission-will.html
-----
Auto wont shift
from park?
http://schematicsdiagram.blogspot.com/2011/12/ford-taurus-wont-shift-from-park.html
----
Car Transmission
will not go into Park mode?
http://schematicsdiagram.blogspot.com/2011/12/car-transmission-will-no-go-into-park.html
-----
Shift indicator
directly goes to 2nd when key is turned ON?
http://schematicsdiagram.blogspot.com/2011/12/shift-indicator-directly-goes-to-2nd.html
----
Third gear missing
and engine losing power?
http://schematicsdiagram.blogspot.com/2012/01/third-gear-missing-and-engine-losing.html
-------
Vehicle has whining sound in gear?
http://technoanswers.blogspot.com/2012/01/chevrolet-silverado-has-whining-sound.html
-----
Hard to shift gears on Manual
transmission?
http://technoanswers.blogspot.com/2012/01/hard-to-shift-gears-on-manual.html
------
Car hard shift at slow speeds?
http://technoanswers.blogspot.com/2012/01/car-hard-shift-at-slow-speeds.html
---
Automatic transmission shift lever
hard to move on cold mornings?
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
------
Gear shifts hard?
http://schematicsdiagram.blogspot.in/2012/02/2000-nissan-maxima-shifts-hard.html
-------
Vehicle noticed sluggish
delayed shifts while driving?
http://schematicsdiagram.blogspot.in/2012/03/vehicle-noticed-sluggish-delayed-shifts.html
-------
This will help.
Thanks.
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