Allison 1000 Issue.....Maybe?????
Have 2004 W22 w/Allison 1000 transmission, 65,000 miles.
On our last trip I began hearing a "whinning" noise which sounded like a power steering whine. At low rpm's the noise is more prevalent (like starting out from a green light) but as the transmission shifts thru the gears the whine diminishes and once in overdrive very little whine. I can still hear it but it's faint. At idle no whine.
Driving down the road however if I turn the steering wheel slightly left or right the whine becomes much louder. Then it goes away once the steering wheel is centered.
Convinced I had a power steering system issue, I drained the PS, changed the canister filter and refilled with the proper fluid. I also installed a new idler pulley, new tension pulley and a new serpentine belt. I lowered the front jacks taking the front tires off the ground and moved the wheels from lock to lock to make sure all air was out the of the system and there was no noise from the PS system at all. Quiet and smooth like you'd expect.
Thinking I had my issue solved today I took the coach out for a 15-20 mile test run and the whine is still there just like I described above. So it's making me wonder if I have something amiss in the transmission. BTW....In case your wondering I changed to Transynd following procedures found here in the forum and still have the whine. The transmission shifts fine, nice and smooth and when It's supposed to. Turning the AC off makes no difference either.
So, I'm at a loss and hoping someone can give me tips/advise on what may be happening and what I should do next.
Steve & Debbie plus Bently-Std Poodle & Roxie-Maltese
2004 Mountain Aire 3778 & 2011 Jeep Liberty Toad
"Not All Who Wander Are Lost"