Question about 1999 GMC Sonoma

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Noisy transmission My 1999 Sonoma (AUTO TRANS, 4X4) makes a whining noise when in any gear except park or neutral. Increasing engine speed increases the whine . Whine seems to go away when above 2000 RPM. Drained t-fluid and refilled with new oil and LUCAS transmission additive. New filter too, of course. No change. Thinking that it must be internal. Looking for some validation. Believe that it must be either a pump bushing/bearing ar something like that.

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5 Suggested Answers

hi99ins
  • 123 Answers

SOURCE: Continuous "whine" @ 1500 RPM only; and jerks/2001 Lincoln LS

Run the car from the top of a hill and let it coast at your whining speed. Put it in Neutral, does the whine disappear?
If not its in the drivetrain (wheels, driveshafts, tranny)
Very unlikely to be the timing belt. If it appears at a fixed speed then its drivetrain, if it whines at fixed revs its the engine.
Most likey the transmission I fear....Tires will also make loud whining noise too though...

Posted on Jan 09, 2009

  • 39 Answers

SOURCE: High Pitch whine during acceleration

Hi Pullerwife,

I have a few suggestions for you,

First of all, check your air filter, make sure its clean, not clogged, and doesn't need to be changed.

I don't know how handy you are, but if you are fairly handy, check the idler pulley bearings, if your not, have a shop check it out, as a last resort.

Power steering pump/fluid being low is also a possibility, but thats usually more of a lower pitched whine then what you describe.

You say once the vehicle is warmed up, the whining stops. Does Weather seem to be a factor as well?

Hope I've helped, and don't forget to rate.

Lazaruselite

Posted on Feb 25, 2009

  • 52 Answers

SOURCE: 2000 Jeep Grand Cherokee Ltd transfer case whine

yes low speed whine noise from the center of he vehicle is completely normal every one with the same drive train as your does it. as for jestan flushing the oil will not correct any problems that already exist but it is a good idea to prevent problems from happening

Posted on Mar 23, 2009

  • 1 Answer

SOURCE: whining noise when the engine running

Yep, That was it. i followed a link to trailvoy.com and found a video with the same noise and links to how to repair. My husband fixed it yesterday and the noise is no more!! Good Luck..

Posted on Apr 26, 2009

  • 3 Answers

SOURCE: Whine noise from engine

My whine sounded like the power steering pump ,but the steering was fine. I would turn the wheel and the sound never chaged found out it was the idle pulley next to the power steering pump.

Posted on Jul 15, 2009

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Whining noise on Volvo 240 when in neural and park


A common cause of a whining or buzzing type noise when not in gear (neutral and park) is a WORN PUMP in the transmission. How many miles are on the car??

A noisy pump is just noisy and won't cause a breakdown until it becomes MUCH louder. If the noise is not that loud at this point, just keep driving it for now, and chalk it up to normal wear & tear. But DOOO make sure your transmission fluid is topped off. The amount of fluid between the LOW and FULL marks is about one pint. DON'T overfill OR allow it to get below the LOW mark. Transmissions are VERY fluid-level-sensitive.

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on most cars, you need to change the neutral safety switch. this car has a neutral parking position sensor, you can find it for v6 not v8, it also fits a saab 9-3. it is the same thing, a different style. however, check the transmission fluid level and troublecodes for p07xxs. reset the code and use the transmission dipstick by dorman add lucas auto trans fluid, not stop slip to the fill line. most of the time it's not the solenoid, but the auto trans plate, overfilling the fluid can cause it to trigger a check engine light, and the fluid leaking onto it can cause it to be permanently damaged, it's more than $400 for the part. lucas works in the 722.xx transmissions, most , all, clks 99-2002, just make sure the tranny model isn't a 238. i like it better than atf 134. However, these parts are very heat sensitive. fill the trans fluid, reset the troublecodes, do a general motos drive cycle from obdii.com if it doesn't drive good after four times, change the neutral safety switch. :)

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What would cause my transmission to whine, but only in gear, not in neutral or park?


Time for a trans rebuilt

What your hearing is mostly pump noise, from
fine debris in the pump valve bores or worn bores

2001 is way over due to come apart

Worn out from heat & wear & seldom seen a fluid change

Funny shifting is worn & hardened rubber parts,partially
clogged solenoids,dirty valve body,the usual, given the years
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1 Answer

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There are a couple of things to check. If your power steering pump is low on fluid, or a bad bearing is in the Alternator, they will whine. The PCV valve or any hole in the Vacuum lines will whine as RPM is increased. Even having the Air filter box not fully seated will make a whining noise.

Now both automatic and manual transmissions can whine as RPM is increased. Check fluid for each.

Serpetine belt and pulleys-can make noise.

Sometimes you can shift into neutral at any speed and the engine rpm will drop almost instantly as the car rolls at speed. If the problem disappears as soon as the rpm drops, then an engine part probably is the reason.

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Thank you for getting back to me. I would like you to check your transmission fluid. start the engine and let it warm up at idle speed for about 15 min and check the fluid. It sounds like you do not have enough in it, there for the whining noise with increase of speed since your transmission is speeding up with the rate of your vehicle. If this does not help and the problem persist please let me know. If the noise you were hearing was coming from the u joints of the vehicle it would not make a whining noise with increase of speed. The u joints will only make a noise when they are going bad when the vehicle is shifted into any gear from the shifter( EX: park to drive, park to reverse ECT.)


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1 Answer

Whining noise


Can you make the noise happen with your foot on the brake, trans in gear, and a little throttle? And does it go away in park & neutral? If yes to both questions you probably have a faulty thrust bearing in the torque convertor. If no to both questions you like have a faulty "input drum to pump cover thrust bearing." Either way the problem must be repaired ASAP or when the bearing fails it will be at the worst possible time, like in the middle of an intersection with a firetruck bearing down on you.

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2 Answers

'99 silverado 4x4,new trans,no gears.


I don't see you did anything wrong per your description.
With the engine off, check the level of the transmission oil, replace the dipstick, start the truck and recheck the fluid level, level should drop. This will indicate the front pump is working.

Next, with truck running, put transmission into any gear, then return to park position. Do you hear any ratcheting noise.

Let me know.
Regards,

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