Question about 1991 GMC K1500

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Hard shifting i have a 1991 gmc sierra single cab, it shifts hard on 2nd gear only. It seems like it just takes long to go into gear!

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  • Anonymous Mar 23, 2014

    A flutter tone from the engine compartment. Noticeable from in the cab, but seems to go away when truck shifts to 2nd gear.

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U may have a dirty valve body passage, have u changed the trans fluid and filter in the last 60,000 miles,. if no do and use the new GM Dexron VI trans fluid, it has greatly improved shift characteristic's and has the best detergent property out there to keep the trans clean. I have personnel experience with this fluid in my 96, I was amazed.

Posted on Dec 24, 2008

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Posted on Jan 02, 2017

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1 Answer

I have a 1992 GMC Sierra 4wd single cab, is there a wire that needs to be plugged into intake in order for vehicle to shift into 2nd and 3rd gear?


Not a wire. Your transmission shift cable may be disconnected from the throttle. Or if you have a vacuum modulator the vacuum tube may be disconnected. Check your fluid level.

Jul 04, 2015 | GMC Cars & Trucks

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In my 95 GMC Sierra 1500 4x4 just had the transmission rebuilt 3 weeks ago I was driving down the road and it shifted 1st to 2nd fine but from 2nd to 3rd it reved up all the way to 4500 rpms before...


That could be a perfect reason to take it back to the shop where it was just repaired for repeat service. Either that or you spun out in the mud.

Nov 29, 2014 | 1995 GMC Sierra C1500

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Transmission slipping in 2nd gear


1 Ck A/T fluid level & quality
2 Scan/ck for code(s)
3 With scan tool connected,road test vehicle/Ck parameters....
....time for a pro !!

Apr 06, 2014 | GMC Sierra Cars & Trucks

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

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I have a 94 gmc sierra with 350 that has problem shifting to 2nd


Your problem likely resides with the hydraulic valve that operates the band for second gear, or lack of hydraulic pressure in the transmission. If the actuator in the transmission that operates second gear is getting sticky, then it will cause this. A filter change and flush may help, but it's likely time to start looking for someone to tear down your transmission, or replace it.

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1984 gmc sierra shifting hard in all gears


Your throttle valve on the transmisson is probley not adjusted to spec on this vehicle it runs from carb to right side of trans.


hope this helps

Feb 11, 2009 | 1991 GMC K1500

1 Answer

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Trans is in safe mode, you will have to get scanned to see codes.

Jan 10, 2009 | 2005 GMC Sierra

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