Question about 1993 GMC Sierra K1500

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1997 GMC k1500 4x4 1/2 ton, hard shift from 1 to 2

I had the valve body changed this didnt make any difference. Keep in mind the transmission was completly overhauled in Feb of 2008. What else could it be?

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Check lock up solnoid

Posted on Sep 05, 2009

Testimonial: "Thankyou,you have been very helpful and where do I find this lock-up solnoid? Is it external or internal?"

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1 Answer

Hard shift low to second


In general-- a transmission that is failing

You can remove the valve body & clean it,
just keep in mind all the check balls fall out,
so you will need a diagram of it

After that-- you have to diagnose & replace any
shift solenoids that apply

Old vehicle & trans,I wouldn't change solenoids or
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This is real common on gm trucks. The valve body will need to be changed. Reman valve bodies are all over. Cost should be about 300-500

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I have a 1996 Jimmy 4x4 vortex engine, the tranny will shift from overdrive to a lower gear all by itself while going down the highway causing the rpms to go up over 3000. I pull over and shut the engine...


Hello,

A couple of things come to mind that can cause the issue you are having;

1. Make sure your transmission fluid level isn't low.

2. If your transmission fluid hasn't been changed in a long time, you could have some deposits
built up in the valve body, or the screening could be partially clogged.

3. You may have a faulty shift solenoid/shift motor.

Number 3 is most likely your problem.

I hope this helps you.

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The 1-2 /3-4 shift solenoid is located at the back of the valve body in the transmission pan. You don't have to drop the valve body, just the transmission pan and the solenoid is held on by a simple clip. Once the solenoid is accessible, disconnect the wire leads and undo the clip and the shift solenoid slides out from the valve body.
Good luck and thank you for using Fixya, Note that most of the time when there is a solenoid failure, it's caused by a faulty wire lead from the ECM to the transmission. The wire harness runs from the ECM on the passenger side fender to the passenger side of the transmission by the Catalytic Converter. Inspect the wire connection on the transmission first before trying to replace the solenoid to save you time and money.
Thank you for using Fixya and good luck

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97 yukon 4wd. Jerks and makes noise like its


Hi amberdawn_84

My 97 yukon did the same thing (I believe). The valve body in the transmisson wears out (design problem) and causes the transmission to shift really hard. My repair was about $500 (nondealer).
LOVE MY YUKON!

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1 Answer

2000 GMC 2500 4L80E hard shifting after warm up


1st and 2nd shift solenoids has sediment causing them to stick.or you got damage leaking seals. it might help if you put a little transmedic in transmission dont over fill. if your valve body full of sediment it causing valve in valve body to stick.this might help still might have to go in transmission.

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Where is my 1 2 shift sensor 2000 gmc jimmy


Inside trans. pan at the rear of the valve body. They have a wire clip which holds them in.

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