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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Transmission, Truck
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#632 of 1484 transmission troubles
Jun 06, 2010 (12:00 pm)
I have a 2007 GMC Sierra 1500 Z71 with 48,000 miles on it. The transmission has some sort of glitched as I approach or depart a light or stop sign. Instead of a smooth shift either up or down I feel a sudden locking of the transmission or something of the sort resulting in a "sudden jerk". This has nothing to do with the locking differential which works well in slippery road conditions
When I purchased the truck apparently it came with a yoke that was not sufficiently greased as many times this manifested itself as though I had been rear-ended lightly when stopped at a light. The GM dealer greased the yoke and this helped. But now I have this problem. Could it be that the yoke has to be greased again ? Does the yoke have to be greased several times over the life of the vehicle ?
I have checked the fluid level and it id right within specs and the color is still bright red. I've never used the truck to tow anything. Any Ideas ?
#633 of 1484 2007 2500 hd trany issue
Jun 09, 2010 (3:57 am)
i have a 2007 sierra 2500 hd two wheel drive when coming to a stop the trans down shift hard and cause the truck to lunge forward . also was traveling at apx 45 miles an hour went to pass a car stepped on accelrator hard and the trans slipped causing the engine to rev but no increase in speed wondering if this is commom in the 6 speed transmission on these gmc thanks for any input
#634 of 1484 Re: 2007 2500 hd trany issue [epphonehome1]
Jun 10, 2010 (6:14 am)
I apologize that you are having issues with your vehicle. Can you please email me more information about your situation so I can look into it further? You can get my email by clicking on my name. Thank you,
Mariah GM Customer Service
#635 of 1484 Re: 2007 Sierra Hard Downshifts [kelsan1]
Jun 10, 2010 (10:17 am)
First thing that would come to my mind, if its intermittent would be pressure control solenoid. High line pressure would cause it to be loud and hard maybe thunk.
#636 of 1484 01 4.3 1500 misfires
Jun 10, 2010 (10:43 am)
Hi, I am going to say what a pain.
I have a 01 1500 4.3 po300 flashing engine light. let me say I have a scanner and consider myself to be somewhat knowledgeable. but I am looking for ideas.
I have po 300 right bank 2 4 6 misfires engine obviously lacks power. barely runs . I have -35 degrees cam retard. Wont run long or fast enough to do crk learn. I think it is symptom of misfire not cause. I have pulled exhasut off pass side to eliminate the cat. doesnt change it without cat c onected. I got it to run long enough to set o2 code but it was for the heater circuit. I have read that the injectors should have 11-14 ohms resistance if checked at the pins in the upper plenum Anyone heard that. Mine do not have between 5 - 8 ohms. on the 6.. Is it likely all 6 injectors went bad at once. the fuel trim is being cut off on the even bank -25% while odd side is dumping +25%. I want to believe its come down to pcm ,spider,02's, possibly maf but it doesnt change and has comparable readings to my v8 burban. i am open to ideas distributor, but that would explain timing but not dumping of fuel
fuel pressure is koeo 62psi, and 58 barely running. Thanks
#637 of 1484 99 Silverado 1500 Z71 Tranny Issue
Jun 13, 2010 (8:00 pm)
My '99 Silverado has suddenly lost reverse. All the drive gears work fine & the tranny fluid is OK so what would cause this? At over 225,000 miles is this the beginning of the end for my tranny?
#638 of 1484 04 Chevy Silverado Z71
Jun 15, 2010 (9:17 am)
I have a 04 Silverado and right after my truck passed 70,000 miles, it began not engaging in reverse. This doesn't happen every time but probably 3-4 times a month. One thing that does happen every time is it shifts really hard when I put it in reverse. It also makes a loud noise, like it's hunkering down. This is very frusting because I bought this truck hoping that I would not have to worry about making expensive repairs! I am thinking I will have to buy a new transmission by the end of the year! Does anyone have any ides what is causing this? I really don't want to trade my truck in if this is a sign to other things that might be coming! Thanks everyone!
#639 of 1484 2003 Silverado 250HD Transmission problem
Jun 17, 2010 (10:50 am)
Just happened today. 2003 Silverado HD 6.0L 4sp overdrive transmission with 92,000 miles. Parked it a week ago and had absolutely no issue. Went to drive it 1 week later and the transmission kicks real hard going from 1st to 2nd; kicks very hard going from 2nd to 3rd, kicks hard going from 3rd to 4th. When I started it up, put it into reverse and usual it begins to move on its own; this time it sat until I fed it gas. Is this transmission or rear end? Any suggestions?
#640 of 1484 Re: transmission troubles [myale]
Jun 17, 2010 (6:48 pm)
Please see my post from a couple of weeks ago regarding the drive line/rear spline grease repack. The dealer told me that it could help from 6000 to 30000 miles but no set guarantee. It has stopped the hard downshift completely for now, it was about $100 to drop the driveline and grease it and replace the driveline back. Hope this helps you.
#641 of 1484 Re: 04 Chevy Silverado Z71 [ftosrod]
Jun 18, 2010 (10:15 am)
Don't mean to discourage you, but in case you did not read all the Chevy transmission problems: We bought a 2500HD new in 2002 and the transmission has gone out twice. We do not drive many miles and we do not tow anything except a very small livestock trailer. The only time we use the trailer is to haul maybe one or 2 cows a couple of times a year to our pastures with a round trip of about 6-7 miles. We hire a truck for anything more. When the transmission went out again a couple of months, ago the specialist asked how is it we "trashed" 2 so fast? Then he researched and found this is a re-occurring issue on these transmissions. So much for being loyal GM owners for 45 years!