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Difficulty Shifting: 2001 GMC Sonoma
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gigem12
New User
Oct 19, 2012, 3:30 PM
Post #1 of 9
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Difficulty Shifting: 2001 GMC Sonoma
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2001 GMC Sonoma
4 cylinder
5 speed manual
135,000 miles
Hello,
I am having difficulty shifting gears while my truck is running. If the truck is off I can shift through all of my gears completely fine. However, once the car is running it becomes difficult. If the car is not moving and I try to get into first or reverse it is especially difficult. Also the truck seems to want to move forward very slightly when in first with the clutch down all the way. Once moving it becomes slightly easier to shift through the rest of the gears but it is still very rough. Any help would be appreciated. Also, I tried pumping my clutch to see if there was air in the lines (hydrolic clutch) and it did not seem to help. The hydrolic fluid is full too. I replaced my clutch about 20-30 thousand miles ago.
Thanks you for your help
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nickwarner
Veteran
/ Moderator
Oct 19, 2012, 4:36 PM
Post #2 of 9
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Re: Difficulty Shifting: 2001 GMC Sonoma
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You either have air in the lines that isn't fully bled out (some can be a real demon to get bled right) or a master cylinder whose seals aren't able to keep up against the pressure. By the fact that your clutch never fully disengages shows it to be a hydraulic issue, especially on a new clutch assembly.
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 19, 2012, 4:37 PM
Post #3 of 9
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Re: Difficulty Shifting: 2001 GMC Sonoma
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Obviously the clutch isn't releasing. The hydraulic system has to be the culprit. Could be a master that is leaking internally allowing pressure to bleed off. If the slave is leaking, you'll see brake fluid leaking and low level in the master reservoir.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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nickwarner
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/ Moderator
Oct 19, 2012, 4:38 PM
Post #4 of 9
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Re: Difficulty Shifting: 2001 GMC Sonoma
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Beat you to it by 1 minute DS. O'Doyle rules!
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 19, 2012, 4:43 PM
Post #5 of 9
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Re: Difficulty Shifting: 2001 GMC Sonoma
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I had to get up and grab a beer. That is my story and stickin to it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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nickwarner
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Oct 19, 2012, 4:57 PM
Post #6 of 9
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Re: Difficulty Shifting: 2001 GMC Sonoma
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Yet you didn't grab me one? I see how it is. Now you're just making it harder on my girl since she has to go do it.
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 19, 2012, 5:02 PM
Post #7 of 9
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Re: Difficulty Shifting: 2001 GMC Sonoma
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Tell her I am really really sorry. 
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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gigem12
New User
Oct 19, 2012, 6:15 PM
Post #8 of 9
(6159 views)
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Re: Difficulty Shifting: 2001 GMC Sonoma
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So do you think i should start with the master or slave cylinder or both? My boss said he would help me install it. How difficult is it to access normally. Thank you for all the help
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nickwarner
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Oct 19, 2012, 8:03 PM
Post #9 of 9
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Re: Difficulty Shifting: 2001 GMC Sonoma
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Most likely the master and you better hope I'm right. Here's the procedure for the master.
- Disconnect the negative battery cable.
- Remove the master cylinder rod from the clutch pedal.
- Turn the master cylinder 45 degrees clockwise to unlock the master cylinder.
- Disconnect the wiring harness from the clutch master cylinder start switch.
- Remove the clips securing the clutch line to the dash panel and heat shield.
- Remove the clutch master cylinder from the dash panel.
- Raise and support the vehicle.
- Using J42371 clutch line release tool, remove the clutch line from the concentric slave cylinder.
- Lower the vehicle.
- Remove the clutch master cylinder.
  
Fig. Turn the master cylinder 45 degrees clockwise to unlock/lock the master cylinder
To install: - Install the clutch master cylinder.
- Raise the vehicle.
- Pull back on the connector sleeve and connect the clutch line to the concentric slave cylinder.
- Lower the vehicle.
- Install the clips securing the clutch line to the dash panel and heat shield.
- Position the clutch master cylinder into the cowl panel hole.
- Turn the master cylinder 45 degrees counterclockwise to lock the master cylinder.
- Connect the wiring harness to the clutch master cylinder start switch.
- Connect the master cylinder rod to the clutch pedal.
- Bleed the clutch.
- Connect the negative battery cable.
And here is what you're looking at if its the slave.
Print
Removal & Installation
- Disconnect the negative battery cable.
- Remove the transmission.
- Remove the 2 bolts securing the concentric actuator cylinder to the clutch housing.
- Remove the actuator cylinder from the transmission input shaft. If required, the bearing can be removed from the actuator cylinder for replacement.
Fig. Concentric actuator cylinder location on the transmission
To install: - Position the actuator cylinder to the transmission input shaft. Ensure that the bleed screw and the coupling are positioned toward the transmission ports.
- Secure the concentric actuator cylinder to the clutch housing with 2 bolts and tighten to 71 inch lbs. (8 Nm).
- Install the transmission.
- Connect the negative battery cable.
If you're not leaking at the slave, which you would need to look through the hole at the side of the trans very closely to be sure, its the master. Since you had to replace the clutch not long ago, I don't know why you didn't change it then. If it was in my shop or a vehicle I owned I wouldn't put that trans back in without a new one.
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