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Chevy Silverado and GMC Sierra Transmission Problems

503 messages,  Last post on Nov 10, 2009 at 5:28 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Transmission, Truck


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#118 of 503
2005 SILVERADO TRANSMISSION PROBLEM by kylec65
Jul 17, 2007 (7:51 am)
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#119 of 503
2005 SILVERADO TRANSMISSION PROBLEM by kylec65
Jul 17, 2007 (7:51 am)
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Has anyone else had any problems with a 2005 silverado transmission?? Mine went out yesterday at 44K miles and just over 2.5 years old. Just my luck that it happens after the 36K warranty has expired. Has anyone had any experience with GM's Goodwill policy \ Secret Warranty program? I'm hoping they will give me some sort of assistance in fixing this as I have owned 3 other silverados, all of which were driven to at least 130K without any major problems aside from routine repairs. Thoughts or recomendations for proceding with GM???
#120 of 503
Re: 6-speed transmission problem [treehuggerjake] by mdsxs4
Jul 19, 2007 (6:55 pm)
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Replying to: treehuggerjake (Jul 19, 2007 2:34 pm)

I have a 2007 crew cab with the 5.3 the tranny has been out 2 times in 28000. I will probably not buy anither chevy. i had a 2005 crew cab that the 4x4 system was always showing service 4x4.
#121 of 503
A 2007 Silverado = A 1977 1/2 Ton Chevy by thereisnospoon
Jul 23, 2007 (11:35 pm)
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hey gmctruck - if GM actually REDESIGNED their "redesigned" trucks then maybe they wouldn't have the same problems that they had 5, 10, 15, or 20 years ago. Instead, they are being only further put into the stone age by the developments that Ford and Toyota have made on their trucks, which is making GM the laughingstock of trucks. Although Toyota has a good engine/tranny combo if it wasn't for the camshaft failures, the design of the F150 is still 5 years above every other truck on the road. I wasn't very partial - as a matter of fact, I was a chevy man - until my 2002 Silverado caught fire on the freeway at less than 10,000 miles. My buddy's 1999 Sierra had 120,000 miles on it, but he's easily put $10K into that truck (transmission TWICE, alternator twice, maybe three times, fuel pump). I laugh when I see new Silverados out there that STILL have piston slap!!!! I put 140,000 miles on a 2002 4.2L V6 F150 with no service other than factory scheduled maintenance. I kept denying my grandfather's desire to buy only E350's and F150's and F350's for his construction business. He would buy them, run them to 300,000 miles and trade them in on new ones. Very rarely did he ever have a problem with any of those trucks or vans. Strangely it seems the people who have "long lasting" GM vehicles NOWDAYS are the people who drive them only on the weekends for less than 50 miles each way. I just got through purchasing a Fusion and this car is worlds above the Camry or Accord. See, Ford is using Mazda's marriage to their advantage as well as DEVELOPING their new line of vehicles. I haven't seen anything truly NEW from Chevy in a LONG, LONG time.
#122 of 503
Re: 07 transmission [bumperdude] by 1offroader
Jul 24, 2007 (5:55 pm)
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Replying to: bumperdude (Jul 19, 2007 3:11 pm)

bumperdude
 
What was the problem with your tranny? I also have the 6.0L w/super duty trans. No problems w/mine, but just in case, what was the problem with your tranny? How did they fix it?
 
1offroader
#123 of 503
Re: 6-speed transmission problem [skytop1] by 12ozcurls
Jul 24, 2007 (6:14 pm)
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Replying to: skytop1 (Jul 18, 2007 4:33 pm)

yeah i don't know what is happening with car companies these days. The new Tundra 6 speeds are having similar problems...
#124 of 503
Re: 6-speed transmission problem [12ozcurls] by 1offroader
Jul 24, 2007 (7:45 pm)
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Replying to: 12ozcurls (Jul 24, 2007 6:14 pm)

Here's a theory on why the new 6 speeds might be having problems. It's just a theory, so don't flame me. I do have some experience with automobiles, but none at all with electronic transmissions. But I generally know how they work.
 
An auto trans is designed to operate over a relatively wide range - from a standing start to cruising speed. That range is segmented into the number of gears that the trans has - 4,5,6, whatever. There is an operating range assigned for each gear. Each of these operating ranges has some overlap into the range above and below it. These ranges can be programmed, esp. on the new electronic transmissions. Other factors that determine the operating range of each gear are the engine vacuum, throttle position, rpm, etc. On top of all that, throw in emission controls.
 
If there is too much overlap between these programmed ranges, the trans can "hunt" for the gear it wants, causing erratic shifting, etc. If there is not enough programmed overlap, response can be sluggish because the trans will not downshift when you want it to.
 
Does your trans have "tow mode" button? That just re-programs slightly the operating range of each gear for better performance (but worse fuel mileage).
 
Now, the more gears that a trans has, the narrower each of the ranges. It's like slicing a pie into more pieces - they become smaller, but the pie, i.e. the overall operating range of the vehicle, remains the same. More gears require better programming to get a good mix of upshifting, downshifting, economy, etc. without the "hunting" for the proper gear. Imagine a 20 speed - what gear should it be in at any particular time? 14th? 15th? 18th? Who knows?
 
Clearly, the new 6-speeds have not been programmed yet to get this optimal response. This is a case where less, i.e. fewer gears, is better until GMC and Toyota come up with better programming. Auto makers have been building 4 speeds for just about ever, so they have it figured out. In a few years, they will probably get the 6 speeds corrected. Unfortunately, they will make some unhappy customers in the meantime.
 
That's my theory and I'm stickin' to it, until someone has a better explanation.
 
1offroader
#125 of 503
throttle positioning sen by tdscriner
Jul 25, 2007 (5:53 am)
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Would the electronic throttle positioning sensor cause my transmission not to shift int 3rd & overdrive? I have reverse, 1st, & 2nd but no 3rd & OD. Goes into Neutral when trying to shift into 3rd.
                           Thank-you
#126 of 503
Re: throttle positioning sen [tdscriner] by obyone
Jul 25, 2007 (11:26 am)
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Replying to: tdscriner (Jul 25, 2007 5:53 am)

Nope
#127 of 503
Re: throttle positioning sen [tdscriner] by 1offroader
Jul 25, 2007 (5:57 pm)
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Replying to: tdscriner (Jul 25, 2007 5:53 am)

I had a 1968 Mustang that wouldn't go into 3rd (3 speed trans). Although that trans was nothing like the new electronic transmissions, that problem was due to a faulty vacuum shift module. Your problem could be similar.
 
1offroader

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