Question about 1999 GMC Sierra

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SHIFTS HARD FROM 1 TO 2 AFTER ABOUT 3/4 HOUR OF DRIVING

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This could be a lot of problems. There are a couple things ya have to check, the first being the condition of the transmission fluid, if it is dark brown then it means it is burned. You can do a transmission flush but it may do more harm than good. Second would be to see if the check engine light is on, and works. Turn the key to the on position making sure it comes on and then start the vehicle. If it stays on then you need to see what the code is because the sensors to the computer could be faulty and thus causing the problem. Those are two good starting points.

Posted on Jul 20, 2009

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Posted on Jan 02, 2017

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My Cadillac 2006 3.6 engine auto hard shifts between 55 and 60 km per hour


Solenoid problem or internal transaxle issue

Neither is an easy fix

Any time you have a trans issue stop using it
immediately until completely resolved

10 miles of driving can ruin a transmission

Don't over look a clogged gas filter or blocked
exhaust converter,trans may be okey,check those items

Sep 14, 2013 | 1997 Cadillac Catera

1 Answer

When trans. is warm after extended driving the up shifts are very hard. This only happens during extended driving periods. Around town everything shifts fine.


Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check Throttle Position Sensor (TPS) for smooth electrical response. If the response is jumpy or erratic at all, replace TPS. Good luck Auto Zone or Parts Source has this part and can be replaced with in 20 min. Both parts store will have the step by step instructions and i believe the cost is around $65.00 for the TPS which is better then a transmission replacement.

Nov 30, 2009 | 2000 GMC Yukon XL

1 Answer

95 buick lesabre shifts hard


1. There may be a vacuum leak anywhere under the hood.
2. The vacuum governor mounted on the transmission is broken (has a ruptured diaphragm). Easy to replace, has one bolt and a small (one inch) locking plate.
3. Replacement at AutoZone is around $12~~20.

Hope this helps!

Sep 07, 2009 | 1995 Buick LeSabre

1 Answer

VERY HARD SHIFTS AFTER ENGINE IS WARM.


Your going to have to get the car scanned for the DTC code. The Check engine light indicates that the ECM has detected an issue with the cars engine or transmission performance. Your hard shifting could be the failure to the Pressure control solenoid (PCS), that would be a DTC code P1811. The PCS is located under the trans axle side cover assembly. IF you go to Auto Zone, they can scan your car free of charge and can give you the step by step instruction to replacing the part that may have failed. Good luck and keep me posted, be glad to help.

Jun 12, 2009 | 2000 Buick Regal

1 Answer

Overdrive Problems


On top of engine as your facing it, there should be what looks like a temp. sending unit with a 2 wire plug on it, chg. that, it sends a signal to trans. when it gets warm enought to shift to overdrive. If trans shifts fine but won't go into overdrive thats most likely the problem.

Feb 19, 2009 | 1993 Chevrolet K1500

2 Answers

Tranny shifts really hard only when ive been driving for a long time but it doesnt take long or rev up the rpms and then shift it shifts right on time but VERY hard all i have two do is turn the truck off...


valve body could be sticking.if computer sees a problem with tranny it will go into failsafe mode which means full line pressure this causes a hard shift. there is a repair kit for valves in the valve body

Aug 10, 2008 | 1999 Chevrolet K1500

1 Answer

Monte carlo


You need to rebuild the transmission,it's over heating. May want to check your transmission cooler first .
Please rate this!

Jun 10, 2008 | 2001 Chevrolet Monte Carlo

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