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Thread: Allison whining noise

  1. #1
    Join Date
    Nov 2002
    Location
    Fairbanks, Alaska
    Posts
    61

    Arrow Allison whining noise

    My '03 Chev 2500HD with an Allison trans has 38,000 miles.

    I know these trannys whine a bit but mine is getting louder with time. Is this normal????

    Reason I ask is that my dealer recently took the trans out to get access to the oil pan on my duramax and whn I picked it up it had a new oil pan on the tranny. They said it slid off the tranny jack in the shop. Is it possible that there was some internal damage to the tranny when they damaged the oil pan? Seemed the whine was more noticable as soon as I picked up the truck after the work was done.

    The dealer says the damage was superficial to the pan but how would I know. Maybe I should ask them to take the pan off and have another look.

    Is there anything internal that could be damaged when they damaged the pan???
    \'03 Silverado 2500HD Ext Cab, Long Bed LS trim- Pewter, Duramax - stock

  2. #2
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,382

    Lightbulb

    Accidents happen.... but it sure doesn't inspire confidence when a dealer screwup happens to your own truck....

    You've driven the truck long enough to know what is normal sounds for the Allison. Yes, these transmissions will whine, but it's mostly noticeable when cold - and mostly during the cold winter months. I can't hear mine when it's warmer outside or anytime during the summer.

    If I thought the whine was abnormal, I'd pull the pan myself and have a look. If you take it to another shop, take along a camera to document what you "might" find.

    Jim

  3. #3
    Join Date
    Apr 2001
    Posts
    275

    Default

    One slim possibility that I can think of would be the filter. I can't imagine the height they would have had to drop the trans from in order to dent the pan deeply enough to damage the filter, but filter damage could cause a whine. If the pan did bend the filter enough to crack the neck or damage the seal, or if they had the filter off for some reason and damaged the seal, the pump could suck air around the seal and cause a whine due to cavitation. It's a slim possibliity, but a possibity nonetheless.

    Something to look for while the pan is off next time, anyway...

  4. #4

    Default

    First post on the board, but I can't resist...

    I would hate to have been around to see a big Ally sliding off a transmission stand!

    Larry

  5. #5
    Join Date
    Feb 2002
    Location
    MI, USA
    Posts
    14

    Default

    Is your truck 2wd or 4wd? If it is 2wd, did the rear yolk hit the floor? If it did they may have damaged the bearings in the rear of the trans. The trans may still function with the damaged bearings for a while, however they will fail eventually. In a 4wd unit, this kind of damage is less likely, the 4wd output cover would have been damaged.

  6. #6
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,057

    Default

    If it started whining when the dropped it, I'd do some whining of my own...
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
    New ride: MB GLS450 - most stately
    Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510

  7. #7
    Join Date
    Nov 2002
    Location
    Fairbanks, Alaska
    Posts
    61

    Default Response From Dealer

    I spoke with the service manager at the dealership where the tranny was "dropped". We made an appointment and he said he would make it right.

    To answer the previous question...the truck is 4WD.

    I spoke with allison who seem to think it unlikely that the drop could have done damage but they also suggested checking the transfer case (in case the guy forgot to re-fill it possilbly). anyway it was full of the right fluid.

    they say that the first sign of damage to the valve body would be bad shifting...it shifts fine.

    Another thing I notice is that my tranny is way overfilled with tranny fluid.....COULD THIS BE THE PROBLEM????The dip stick says don't overfill but it registers at least 3 inches above the "hatch area" on the stick. This is the way the dealership refilled it after the work.

    Why does the stick warn you against overfillling the tranny????I would love to know.
    \'03 Silverado 2500HD Ext Cab, Long Bed LS trim- Pewter, Duramax - stock

  8. #8
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    An overfilled tranny can cause noises, and terminal damage. The internals of the tranny are dynamic while in operation, and need air space above the fluid level to absorb shock pulses. Take away the "shock absorber", and seals, pump vanes, pistons, valves, etc, hammer against each other. This usually results in internal/external leaks and case damage, but you may be just short of that. I would think with it overfilled that much, it would have poured out of the vent, and made a huge mess on the ground and the underside of the truck.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  9. #9
    Join Date
    Nov 2002
    Location
    Fairbanks, Alaska
    Posts
    61

    Default No mess

    I haven't dumped any tranny fluid.

    It's another two weeks before I get into the dealer.

    One of these deals where if I drain some fluid before i go to the dealer it might be hard to make the case that the damage was theirs but if I don't I might really scrw up my tranny.

    I guess I'll just drive by there and show them the level and establish that's how they filled it last.
    \'03 Silverado 2500HD Ext Cab, Long Bed LS trim- Pewter, Duramax - stock

  10. #10
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Are you checking the fluid level with engine running, tranny at operating temp, and in P? Any of these conditions missing can cause a higher than normal reading.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  11. #11
    Join Date
    Nov 2002
    Location
    Fairbanks, Alaska
    Posts
    61

    Default tranny level OK

    Checked tranny fluid level properly this time and it is OK, so the whine isn't coming from an over-filled tranny.
    \'03 Silverado 2500HD Ext Cab, Long Bed LS trim- Pewter, Duramax - stock

  12. #12
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Well.......If fluid level is OK, the only thing left is damage. Don't let 'em off the hook!
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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