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Old 04-30-2014, 09:17 AM   #1
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Allison Transmission howl

I have a 2008 Gulfstream FRED MH with a 6 speed Allison Transmission. It sounds like a howl coming from the transmission when I let up on the accelerator or when it is coasting. Any experience this?
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Old 04-30-2014, 09:28 AM   #2
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Sounds like a U joint going south.
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Old 04-30-2014, 09:38 AM   #3
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Originally Posted by linjerr View Post
I have a 2008 Gulfstream FRED MH with a 6 speed Allison Transmission. It sounds like a howl coming from the transmission when I let up on the accelerator or when it is coasting. Any experience this?
Hi..
Sorry to hear of your issues..
I would be much more inclined to look at the rear axle.. Those kind of noises are indicative of a pinion bearing or ring and pinion issues.. Check the axle grease asap!
Ron
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Old 04-30-2014, 09:45 AM   #4
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Is this a new problem , or something that's on a coach that's new to you?
Do you know the trans model number? 1000, 2500 ?
Noticeable in all forward gears or just , lower gears, 3rd and lower?
All speeds? Any noticeable vibration ?
How many miles on the RV ?
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Old 04-30-2014, 10:13 AM   #5
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Hi..
Sorry to hear of your issues..
I would be much more inclined to look at the rear axle.. Those kind of noises are indicative of a pinion bearing or ring and pinion issues.. Check the axle grease asap!
Ron
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Seems more like a rear axle, (aka: differential), noise.

My differential has been humming loudly, (not howling), for 13 years,
(105 k miles), anytime the the accelerator is applied.

However, since the OP hears a "howl" when he "lets up on the accelerator or when it is coasting" he might have a different problem.

Mel
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Old 04-30-2014, 10:34 AM   #6
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When was the last time the tranny was serviced?
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Old 04-30-2014, 10:42 AM   #7
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Joints & bearings

Never having crawled under your FRED I'm only guessing: but it's possible that you have a split driveshaft. If so there may be a carrier and bearing between the two driveshaft sections. As well as 2 more U-Joints. The bearings have been known to fail. U-Joints fail all the time.

You might also have a Cardan or Double-Cardan joint in the driveshaft. If you see a rubber boot anywhere on the shaft check it for cracks or leaks. Cardan joints are a type of CV joint, they are prone to contamination related failure.

Good luck!
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