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Grinding in drivetrain

Grinding in drivetrain when backing uphill

Grinding in drivetrain

Postby SteveT99 [OP] » Dec 02 2010, 1:50am

Alright, I have a 1999 Silverado, 5.3 with the auto trans, the truck has about 215000 miles, synthetic oil changes every 3k, a couple months back when I was backing up into a driveway with a lightweight trailer (less than 1500lbs) and heard a grinding noise coming from what sounded like the area of the trans. I took it to the dealer, they kept it a week, dropped the trans pan, no debris, no debris in the differential, and could not find the noise. I'm not noticing any debris in the engine oil either. Fast forward a couple more months, and I'm backing up a fairly steep hill with no trailer and no load in the bed, and I hear the grinding noise again. I am able to recreate the noise only when backing up a fairly steep hill or on a hill when holding the break and accelerator, or when backing a trailer up a driveway threshold. Again I took it to a differant dealer, and two days in they can hear the noise, but not isolate it. I had them check the motor and trans mounts, and they were good, any other ideas? The noise doesn't happen any other time when driving, even up steep mountain passes with a 3000lb trailer..

Thanks,

Steve
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Re: Grinding in drivetrain

Postby lzn197 » Dec 02 2010, 2:38am

So it has to be in reverse?
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Re: Grinding in drivetrain

Postby katjar503 » Dec 02 2010, 4:15am

It takes at least 2 components to get each gear 1st gear and rev have one same clutch. The rev input clutch can only be the noise if it is in the trans. I don't think it is in trans. I would be willing to bet money it is a exhaust shield or tin cover loose some where underneath
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Re: Grinding in drivetrain

Postby EKinMN » Dec 02 2010, 4:27am

katjar503 brings up a good point. It may be a loose heat shield. If so, it would likely happen at the same RPM every time. Basically, the vibration of the engine at a certain RPM can cause the shield (or other component) to vibrate or rattle. My last truck had a heat shield that did this at 1750 RPM in 2nd gear, and only after the truck was fully warmed up. It was worse on a hot day.
If you can get under the truck, you may be able to identify it by trying to move things around (be careful if the engine/exhaust, etc. is warm!).

Good luck!
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Re: Grinding in drivetrain

Postby koolz71 » Dec 02 2010, 7:10am

My colorado did the same time..abour 1900rpms in 2nd gear when accelerating slowly..drove me nuts lol...good luck and if there are no metal shavings in ur trans pan or oil filter i wouldnt sweat it
Crap, my hampster fell off the wheel and it broke its leg.

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Re: Grinding in drivetrain

Postby SteveT99 [OP] » Dec 04 2010, 7:41pm

Checked the heatshield, doesn't seem to have any issues, wondering if it's something in the differential.
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Re: Grinding in drivetrain

Postby rkj4243 » Dec 04 2010, 8:10pm

Rear axle or differential would not have any component that would make intermittent noises. They would be more apt to make noise all the time. Another possibility may be your transmission pressure regulator valve "buzzing." That would or could happen sporadically as you describe, and make similar noise a heat shields, etc. If it indeed is pressure regulator valve "buzzing" it is not a major repair or something to worry about.
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Re: Grinding in drivetrain

Postby vandelden » Dec 05 2010, 7:16pm

If this occurs only in reverse and even low gear. There is a Memo about replacing the casting case of the low/reverse piston. Poor quality cast. Your case might have cracked or warped due to heat. Also, maybe the sun shell gear housing has "flared" out, due to heat... Either way if it still operates without change of performance I won't worry until rebuild time. My transmission had that problem and also using the tow switch it will slam between shifts of 1-2 gears.. Finally my 3-4 pack finally gave out at 205,000 miles.
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Re: Grinding in drivetrain

Postby SteveT99 [OP] » Dec 06 2010, 2:20am

Yeah, the driveshell cracked and was replaced at about 175k miles, wondering if they half assed it.
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Re: Grinding in drivetrain

Postby katjar503 » Dec 06 2010, 2:34am

its not the drive shell.
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