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Old 07-11-2019, 08:27 AM   #1 (permalink)
056600
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2019 Allison Whistle in 6th Gear

I have noticed a whistle (similar to a turbo whistle) or a slightly open window when my truck shifts into 6th gear. The whistle is most noticeable between 55-60mph when I am just cruising (not accelerating) above that speed the motor seems to drown out the noise but it is definitely still there. I have put it in manual mode and downshifted to 5th gear and the noise goes away but I think that may be due to the increase in RPM? My 2017 never did this...Currently have 80 miles on odometer SRW CC SB 4x4 and I can definitely distinguish this noise from the turbo. Any insight would be helpful and appreciated.

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Old 07-11-2019, 10:36 AM   #2 (permalink)
Rvn4me
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With only 80 miles on odometer I think your getting not broken in syndrome.
Report back in 500 miles.
New Vehicle Break-In
The vehicle does not need an elaborate break-in. But it will perform better in the long run if you follow these guidelines:
. Keep the vehicle speed at 88 km/h (55 mph) or less for the first 805 km (500 mi).
. Do not drive at any one constant speed, fast or slow, for the first 805 km (500 mi). Do not make full-throttle starts. Avoid downshifting to brake or slow the vehicle.
. Avoid making hard stops for the first 322 km (200 mi) or so. During this time the new brake linings are not yet broken in. Hard stops with new linings can mean premature wear and earlier replacement. Follow this breaking-in guideline every time you get new brake linings.
. Do not tow a trailer during break-in. See Trailer Towing 0 300 for the trailer towing capabilities of the vehicle and more information.
Following break-in, engine speed and load can be gradually increased.


Last edited by Rvn4me; 07-11-2019 at 10:49 AM.
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Old 08-04-2019, 08:52 AM   #3 (permalink)
056600
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Over 500 now....Whistle still there. Followed break-in procedures.
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Old 08-04-2019, 09:06 AM   #4 (permalink)
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Quote:
Originally Posted by 056600 View Post
Over 500 now....Whistle still there. Followed break-in procedures.
Be persistent with your dealer to resolve this. Depending on state if unable to fix you get a new vehicle.
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