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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  • 60,691 Answers

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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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.

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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.

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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....
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Apr 06, 2014 | GMC Sierra Cars & Trucks

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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.

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I have a 2000 GMC sierra 2500 truck. The guy I bought it from had a new transmition put in it. After driving a while I noticed that the tranny wouldn't shift into low gears 1st & 2nd on comand. and...


-----check possible tps [throttle position sensor ]circuit for damage or faulty sensor----if good check the fuses and trans harness for shorts damage or disconnection,check o2 sensors wiring possible ground to exhaust ,or internal leak 2nd gear apply circuit[servo assembly or 1-2 accumulator] or poor pump pressure

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hope this helps

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1 Answer

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