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Please email me your VIN number and I can check it for you. You can get my email by clicking on gmcustsvc. Thank you,
Mariah GM Customer Service
I was given a copy of the document describing the problem.
Document ID #2350684
#09-04-17-002 (Bump Feel / Clunk Noise at stop or from launch (Clean/Lubricate propeller shaft Slip Yoke Splines) - (Sep 21, 2009)
Models (2007-2009 Chevrolet Avalanche / Silverado)
(2009 Surburban, Tahoe)
(2007-2009 GMC Sierra)
(2009 GMC Yukon, Yukon XL)
That problem has been around since 1999.
start it up, let it warm up, drop it in drive and when it makes the first shift (1-2) it goes into neutral! has happened so many times. or the other situation when driving and making a SLIGHT turn,(usually left) take your foot off the throttle and it drops agian into neutral sometimes it recovers and continues, sometimes not. if it drops out, it sits either waiting for you to recycle the ignition (if you do it either wont respond, or drops into 1st and stays there, or third and stays there) or if you stand on the throttle waiting for it to shift, it goes BANG and back into gear. enough to bark the tires. once i drove it 40 miles at 30mph with the engine pegged just to warm it up! if the temp is hovering between 40 and 50 this happens a lot, if its colder forget it youre not going places. right now the service engine light is on and has been for over a year. 2 NSBU switches no fix, allison dealer wants $1500 just to diagnose the problem which they claim may be electrical in nature. personally i am waiting for this truck to be stolen, or a tree to fall on it , or recall, or Jesus to show up :>) im not paying for this any more! corrosion on the brakes are another issue and all the lines under are sh^t as well as the frame.. 50k for a POS
GMC! cant sell it or trade it.. stuck..
Unfortunately, I cannot diagnose your vehicle over the internet. Doing a flush won't hurt your system especially if it needs one to be done. Thank you,
Mariah GM Customer Service
Also, I snapped the head off a seized bolt on the pan (holds the shift linkage cable bracket in place -1 of 2 bolts. What's best? Heat? liquid wrench (could contaminate tranny fluid)? easy out tool (bolt is already seized, will it work?)? -any suggestions?
Please reply soon as the truck's in the driveway, the job is ready to go back together, and it's about to rain!
dirty
now with 4800 miles this one is doing it.
dealer says there is no problem. BS! unfortunately it is intermittent and hard to diagnose but, it definitely is not right. anybody heard of any solutions to this issue?
Got in one morning and no reverse.
Fluid was burnt.
Changed fluid and seal -still no reverse -nothing at all!
All other gears work perfectly.
I'm told the reverse band is fried, I'm hoping someone gives me a much cheaper solution.
If it is dead and I need to get a used one, I'm told by the local dealership that ONLY trannys from this list (no exceptions) will fit in my truck:
-2WD
-Chev/GMC
-1500/2500
-1995
-Ext. Cab
-6.5 Diesel (maybe a different sized diesel, I'm not certain on that)
From what I understand, it can't come from a suburban, van, or anything other than from above list.
Can someone confirm this for me?
Also, I know this is wishful thinking, is there anything in the steering wheel/column that electronically controls reverse. There's something loose, sounds like it's coming from the steering wheel itself, that's rolling around and klunking everytime I turn the wheel.
What problems are you experiencing with your vehicle? How long has the concerns been present? How often do the problems occur? Thank you,
Mariah GM Customer Service
I took it to the GMC dealership. The service advisor, who has always been very helpful, immediately diagnosed the problem as the "slip yoke". He explained to me GM has been having problems with the slip yoke not being properly lubed and they would lube it for free. If the problem was not solved, they would replace the slip yoke.
They had it for one day. They returned my vehicle to me, and as I drove away from the dealership after waiting on traffic, the loud clunk noise appeared in the shift from 2nd to 3rd. I immediately turned around and they had the mechanic ride with me. He said "yes that's a problem, and I don't know what it is, but there is something wrong. Bring it back Monday and we'll get our transmission guy to drive it."
I returned it 2 days ago, and they called me today to pick it up. They told me they couldn't figure it out and contacted Tech Support. Bottom line, they told me GM said it was normal and there is no solution according to the bulletin. Problem is that I bought a $42,000 truck, and I don't want to live with it. And if it is so normal, why hasn't it always done this, and why don't all GMC trucks do it? I asked and received a copy of the bulletin and this is what it said:
Document ID: 2394678
#01-07-30-042F: Information on 2-3 Upshift or 3-2 Downshift Clunk Noise- (Feb 5, 2010)
Subject: Information on 2-3 Upshift or 3-2 Downshift Clunk Noise
Models: 2010 and Prior GM Passenger Cars and Light Duty Trucks, 2010 and Prior HUMMER H2, H3, 2005-2009 Saab 9-7x with 4L60E, 4L65-E OR 4L70-E Automatic Transmission (RPOs M30, M32, M70)
This bulletin is being revised to ad the 2010 model year and 4L70E transmission. Please discard Corporate Bulletin Number 01-07-30-042E (Section 07-Transmission/Transaxle).
Important: For 2005 model year fullsize utilities and pickups, efer to Corporate Bulletin 05-07-30-012.
Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or 3-2 downshift.
During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be worse on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.
This is a normal condition. No repairs should be attempted.
***END***
Why not just fix the problem??? I am very upset and feel cheated because I actually switched back to GMC from a Ford that gave me zero problems.
Help me please. CAH
But when back to around 20 MPH it would catch again. Did it in Drive and 3rd, eventually got down to 2nd gear and was able to limp home.
Any ideas on why the transmission would not keep up with speed and disengage? Is whole transmission shot?