Question about 1990 GMC Sierra

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1990 gmc sierra automatic transmission won't shift into 2 different gears

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 16 Answers

SOURCE: 1998 GMC SIErra

Check your transmission. Look underneath the truck and see if you see moisture around the transmission pan. If you see any indication of that, you may have a huge issue on your hands. Your reverse gear is seized to the Drive Gear. However hopefully it's something like needing a new clutch or a clutch adjustment

Posted on Aug 23, 2009

outdoorsman5
  • 631 Answers

SOURCE: GMC 1500 Auto, will not shift back into park?

Climb under your pickup and look where the cable connects to the side of the transmission and make sure there is not any mud around the cable or around the shift linkage hookup. If so clean it off and see if it will shift. We have found many of these with mud caked around the shift linkage or a lot of ice buildup and wont allow it to shift into park.

Posted on Dec 11, 2009

  • 8404 Answers

SOURCE: I have a 1992 Gmc sierra manual transmission, the gears are hard

It is an adjustment or clutch replacenment issue. Manual transmissions rarely have a lube issue unless you have seen a big puddle of very thick oil in the driveway.

I think I'd be looking at the clutch of this 16 year old vehicle. Unless you have the tools, time and skill to change the clutch, this is probably a job better left to a professional. Adjusting the clutch mechanism might help for a while but I think you will soon need a clutch job on your GMC.

Thanks for your question at FixYa.com

Posted on Jan 14, 2010

  • 3640 Answers

SOURCE: Brake lights won't come on

check for a bad brake light fuse! if not the fuse, the brake light switch operates brake lights and if bad you will not be able to shift it out of park, as well as the brake lights not coming on.! because you have to put foot on brake to do so. if bad switch, it wont let it out of park. it could be just out of adjustment also!! good-day !

Posted on Aug 28, 2011

  • 693 Answers

SOURCE: My 1993 Gmc Sierra 2500 automatic first gear shifts hard also from park to drive others gears are smooth i have overdrive

The gear shift lever indicators tell you what gear you have an automatic transmission in on your vehicle. The shift solenoid tells the transmission when to shift gears and what gear to shift into. Newer model automatic transmissions have electronic shift solenoids that are activated and change gears based on the speed the vehicle is traveling. Troubleshooting either one of these transmission components is relatively easy if you know a little about automobile mechanics. With the right tools, you can determine whether the transmission shift solenoid is having a problem. Gear shift indicator problems can be determined simply by moving the gears into their designated position.
Transmission Shift Solenoid

  • 1 Raise each corner of the vehicle up with the car jack and place jack stands under the frame. Make sure the car is raised high enough so you can work under the car freely.
  • 2 Slide the drain pan under the transmission fluid drain plug. Remove the drain plug with a ratchet and socket, and let all the fluid drain out of the transmission. Remove the transmission pan bolts with a ratchet and socket. Pull the pan away from the bottom of the transmission, revealing the transmission shift solenoid.
  • 3 Wipe off the shift solenoid with a shop towel. Disconnect one of the two plugs that attaches to the shift solenoid. Turn the knob on the volt meter to the ohms setting, so resistance can be measured. Set the volt meter on 200.
  • 4 Take the black lead of the volt meter and touch the negative battery terminal wire. Take the red lead of volt meter and slide the tip into the terminal plug you just disconnected from the shift solenoid. Look at the reading you get on the digital display of your volt meter. Determine if the reading is between 12 and 25. Readings below 12 or above 25 tell you that the shift solenoid is not working. Reattach the plug to the shift solenoid and pull the second plug attached to the solenoid. Perform the same procedures on this plug wire. Replace the transmission shift solenoid after determining it is bad.
Gear Shift Indicator
  • 1 Move the gear shift into the desired gear. Look at the gear labels and the arrow, or other indicator, to see if the gear shift indicator lines up with the selected gear.
  • 2 Move the gear lever to another gear and look to see if the indicator lines up with the selected gear. Misalignment of the arrow will tell you if there is a problem. Moving the gear shift to "neutral" but having the indicator show the transmission is in "drive" tells you the gear shift indicator is not working properly.
  • 3 Try each gear position to determine how much misalignment is in the indicator. Slide under the car and check for a loose gear shift cable. Check all the gear shift cable connections to ensure they are all tight and are not missing. Tighten any loose gear shift cable clamps or bolts. Replace the gear shift cable if you find that this is causing the misalignment with the gear shift indicator.

Posted on Feb 02, 2012

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How do I fix automatic transmition in 2002 GMC ENVOY 4x4 shifts hard into third will not shift into overdrive already replaced the two solenoids in front before it would not shift to third


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Nov 24, 2015 | GMC Cars & Trucks

1 Answer

If my 1990 gmc sierra 1500 2wd automatic 5.7 wont shift past 2nd is it possible that if I just replace the torque converter that it will be good as new or do I have to change the whole transmission


neither
the torque converter has nothing to do with the gear shifting and unless the transmission is making weird and funny noises , there is every possibility that it is still good
the procedure that you should be following here is to have the fault codes read as it may be a servo/ solenoid that is faulty , a VSS ( vehicle speed sensor) that is faulty or a TCM ( transmission control module ) that is faulty
All of these pieces control gear shifting so the second gear or 3rd gear servo may be out or the TCM is not shifting the ratio
Best thing is to find an accredited transmission specialist shop ( not you local garage or it will be a new transmission for sure) and get it diagnosed properly first and then get quotes

Nov 10, 2015 | GMC Cars & Trucks

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I have a 1993 GMC Sierra automatic that won't go


sounds like maybe the switch I have seen go bad in the steering colume.

Jun 07, 2012 | Cars & Trucks

1 Answer

I have a 97 gmc Sierra v6 automatic and when I start it in the morning it does all the shifts fine and after driving it for about 10 min it struggles to shift into last gear. Don't know what it could...


You don't have a clutch in that automatic, check your transmission fluid first. Make sure you run your truck for 10 min. or so before you check the fluid level. If your fluid is correct then take it to a mechanic, they can check your transmission with their computer and see exactly what is happening when it can't find 4th gear.

Dec 17, 2011 | 2000 GMC New Sierra 1500

1 Answer

My 1990 automatic GMC Sierra wont shift out of 2nd, it just revs higher and higher. Any advice? (It will shift from 1st to 2nd when I take my foot off the gas)


Check your transmission fluid, if it is low, the transmission cannot shift into the correct gear from lack of hydraulic pressure. Be sure to check it while the truck is running.

If it is full, you may need to change the fluid and filter; over time the fluid will break down and trash the filter leading to low pressure problems which is why your truck fails to shift any more than 2nd.

Another problem may be that the torque converter is failing to lock yet again from lack of hydraulic pressure or its just worn out.

Feb 10, 2011 | 1999 GMC Sierra 3500

1 Answer

1990 gmc sierra 1500 4x4 shifts late through all gears


Check the TV cable to the transmission that is hooked to the throttle body. Sounds like it needs adjusted or hooked back up. Sometimes they also stick in the transmission, Try adjusting it first. You need to make it longer to lower the shift points. If this doesn't work let me know. It is likely stuck in the transmission and there is a trick to getting it unstuck.

Jul 18, 2010 | 1990 GMC Sierra

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