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Dropped my trans pan check everything, on my 90 GMC Sierra 3/4 ton 4wd but still wont shift out of 1st

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Either dirty valve body and or wore clutch drums. Rebuild it.

Posted on Dec 13, 2014

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1994 k2500 4x4 wont shift in to 3 and overdrive


This year of GM Transmission doesn't have a vacuum modulator, it is all electronically controlled. And yes a shift solenoid can cause this but that should turn the check engine light on and set a fault code.

Mar 13, 2014 | 1998 GMC Sierra

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The transmission is shifting hard going from 1st to 2nd and from 2nd to 3rd on my 1998 GMC sierra 1500 4x4 5.7 liter. This does not happen until about 15 to 20 minutes of driving. Before that the...


rec check fluid first. If trans fluid hasn't been changed in last 30,000 miles change fluid, filter and pan gasket. At that time inspect for foreign materials in bottom of pan or on magnet if you have one. If truck has over 100K and fluid was never changed you may have more problems if changing the fluid.

Jun 17, 2010 | 1998 GMC Sierra

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I have a 1996 GMC Sierra with an automatic transmission and just recently as i had been driving for about two hours it dropped out of overdrive for about ten minutes or so then re engaged. then i noticed...


The filter has nothing to do with your issues.

Check for a loose or misadjusted brake switch, for the OD issues.

Maybe Electronic,Sensors or Selenoids,on the shift issues.

May 05, 2010 | 1996 GMC Sierra

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2005 gmc sierra. Manual shift 4wd. After using


When you are finished with your 4 wheel drive,put the transmission in neutral, disengage 4 wheel drive and shift to reverse then back up a couple feet before shifting to forward gear.

Jan 15, 2010 | 2005 GMC Sierra

1 Answer

4L 60E - 2001 k1500 will not shift into 3-4. Oil is not burn't and stifts great into1-2


  • No 3rd or 4th gear: “3-4” clutches are worn out. R&R. The car is safe to drive (in 2) until you can get it fixed.
  • Trans shifts into gear harshly, car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmission is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the under hood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.
  • No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : Shift A solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.
Check to see if your transmission is in the limp mode, which would only give you 2nd, 3rd and reverse gears. No 1st or 4th gear.

Nov 19, 2009 | 2003 GMC Sierra 1500

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Will a 1994 chevy 4l80e 4wd swap into a 1995 GMC


Yes they will swap out nicely, the years where they made the change is in 1997 and the only difference is the transmission end housing has a different bolt pattern but has the same internal parts. You may also want to swap out the servo's with a corvette servo. The cost is around $45.00 and can be done without dropping the transmission pan, this will make your transmission shift firmer and will have less clutch slip[ between gear shifts. Good luck and hope this information helps. 

Aug 19, 2009 | 1995 GMC Sierra

1 Answer

89 gmc sierra screwed up while driving


Sounds like you may have broken your timing chain. Try doing a compression test. You should get pressures no less than 90-100 psi. If you find extremely low pressures,you probably lost the chain. This could have caused valve train problems. Good luck

Apr 25, 2009 | GMC Sierra 2500 Cars & Trucks

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