Join Date: Oct 2010
Location: West Bloomfield, MI
Feedback: 0 reviews
Noise, whine or howl, under engine load?
I've Googled for a bit now and I can't really seem to find anything fitting.
Jeep is in the sig line, 117k on the odometer. It has Rubicon axles in it, regeared a couple thousand miles ago to 5.38's with full install kits, housings themselves have around 40k on the front, 70k on the rear, front has RCV's, rear has Alloy Chromos. Stock driveshafts. Engine, trans, and tcase are all stock components. One manifold has been replaced. Jeep is running a PSC power steering pump.
Friday I noticed I was getting a bit of a whine driving down the road and thought maybe I had a wheel bearing going bad or a pulley going bad. Didn't think a ton of it because it was not overly loud, just something I could hear in the background.
Monday driving home from up north I noticed that the noise had gotten louder here are my findings:
Squealing, whining, howling noise
Location is kinda unknown
It is not louder with the windows down, in fact it seems to be harder to hear with my head outside the window than inside the jeep all sealed up
Noise starts around 30-35mph
Noise is only present when on the throttle. It immediately stops as soon as I let off the gas
Noise however does seem to show up when I'm coasting down at a stop, but the pitch kinda changes and it goes to more of a growling noise that sounds like it's "winding down", hard to explain
Noise is present in 2wd and 4wd
Noise doesn't seem to be steering input related
Noise doesn't seem to be AC related
No noise when its reved up in neutral
I did the hose stethoscope thing and didn't hear anything at idle out of the ordinary coming from the belt driven components.
I don't believe it makes any clunking noises going from P-R-N-D, this I have to double check though as my swaylock sway bar bushings are toast and it makes a lot of clunking.
Based on that my thoughts are something in the rear portion of the driveline. Gears, bearings, driveshaft, tcase output bearings...something.
Hopefully tonight I'll be able to get under there and take a look at it.
Do any of you guys have any usual suspects that come to mind?
I've never had a vehicle with this kind of driveshaft, what do you look for as far as wear goes? or is it something that will be quite apparent.
2007 Sahara Unlimited - Dana 60/14 Bolt - 5.38's with ARBs - 40x13.50x17 Goodyear MTRs - 3.5" Rock Krawler X Factor Plus - Rubi Rock Rails - XRC 10,000lb Winch