pm26
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Everything posted by pm26
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Cutting of helical gears:
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Loaner, LOL
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I do not know exactly what they meant by backwards either. It is clear however, that the gear/axle supplier to GM has cut the quality control to a bare minimum and is most likely using poorly trained personnel to assemble the differentials. Helical ring and pinion differential gears, because of their geometry develop forward thrust. Therefore it is imperative to preload the pinion bearings correctly and to properly torque the pinion nut. if the pinion shaft is loose, the pinion gear can exert excessive loading on the ring gear, causing rapid tooth wear and possibly vibration.
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Your diagnosis is correct. Gears machined wrong and meshing improperly would make horrible high pitched whine and would get ruined very quickly.
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Is that from a stainless egg?
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What bothers me about this is that the shaker is a 2015 model. Which means that GM has installed the same defective parts in the 2015 trucks. I will not even consider buying a 2015 GM truck at this point. I have been following this thread closely, looking for a confirmed and positive resolution of this issue. I guess I am wasting my time.
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Hopefully they will get it fixed the fifth time.
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Made in Mexico, China, etc., with nonexistent milling machine operator training and nonexistent quality control. That's how.
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I replaced worn metal gears in the gearbox of one of those Kitchenaid batter mixers (a 6 quart model). One of the replacement gears they sent me had a wrong pitch on the teeth to match with the drive gear on the motor shaft. After I carefully assembled everything and generously greased the gears, I turned the machine on. I heard this horrible high pitched whine, which immediately alerted me that something is very wrong. Sure enough, after I got the right gear and installed it, everything was nice and quiet immediately. Just a little example to illustrate that even when small size gears are mismatched, there will be a lot of noise associated when they start turning at full speed.
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It cannot possibly vibrate. This condition is so rare that only those with a severe case of OCD notice it.
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It is important to emphasize that not all people perceive a vibration problem the same way. Those who are less mechanically inclined may ignore minor vibration issues and live with it and consider it normal. I happen to know a mechanic who specialized in expensive European import repairs (BMW, Mercedes, Audi, Porsche). He told me quite a few stories about vehicles with very noticeable vibration problems simply because wheels needed to be rebalanced due to normal tire wear and owners simply ignored it and did not make a big deal out of it. I suspect this is the case here with 2014 GM trucks. A lot of people never complain because it does not bother them that much. This does not mean this is a rare problem and that those who complain should be ridiculed or marginalized in any way.
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Is 30 days the magic number?
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That would be redundant. GM is already using pitchforks when assembling these trucks.
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I saw this posted in another thread in this forum recently: "Hmm well I was going to really brag on how good GM is doing but the construction company that I work for just bought a brand new 2015 3/4 ton WT today right off the lot and the driveshaft fell out before we could use it for anything." It is obvious that GM has some quality problems to resolve.
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Post an update a week later. Hopefully it will still work fine.
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GM has two proven repair methods to resolve these vibration issues. First method: CANNOT DUPLICATE Second method: NORMAL (OPERATING AS DESIGNED) And the best part is that these repair methods work well and also happen to be the cheapest. What's not to like?
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Did you expect a machined titanium brace in there?
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Yes, they certainly did an extensive research how to make the cheapest possible seat frame and charge the highest possible price for the truck.
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It most likely isn't a factory option, but if the dealer installed it on a new truck before the truck was sold, then such mod is approved by GM and the truck should carry the same warranty as a stock unmodified truck. The same is true for customized vehicles (e.g. vans) when the work is done by a GM approved company on a new vehicle before sale. At least this is what a GM salesman told me about such vehicles several years ago.
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Something similar to magnetic resistance on exercise equipment like stationary bikes and elipticals?
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I bet that even a new model A Ford you could buy new for $ 385 eighty years ago did not need hose clamps to keep the seat from moving around. How has technology progressed! Now GM trucks costing more than 100 times as much need them.
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There is a lot more junk parts on these trucks than just tires.
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We were discussing vibration problems only. The other 10% is other issues like bad seats, radio problems, starting problems, bad paint, etc.
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All I have to say is that if he bought three 2014 trucks and they all have vibration problems, then this defect must be a lot more frequent than 1 in 10 trucks. If only 1 out of 10 trucks was defective and the defect was randomly distributed, then the probability of buying three trucks in a row with the same defect would be 1/10 X 1/10 x1/10 = 1/1000. Yes, one in a thousand. if you were to choose a truck from a lot of one thousand trucks where only one truck was defective, the chances of picking the bad truck would also be 1 in a thousand. Either the guy had really bad luck picking these trucks, or, more credibly, the defect is quite common, especially in certain lots that probably received certain defective assemblies and/or tires. (I am using 1 defective truck in 10 based on the statement of the local dealer tech that about 10% of the trucks sold there are coming back to service with vibration problems).
