DaveO9
Full Access Member
Vehicle: 2013 Tahoe LT. 207k.
I'm getting a hum or slight howl in both auto 4wd and 4-hi. Noise goes away (at least most) when letting off gas to coast or brake. Most pronounced when accelerating. noise stops immediately after switching to 2wd. I've only heard it in the driver's seat so far; I need to ask my son or wife to drive it and let me sit in the back and front pass. I think I'm hearing it up front. At first I thought it was the t-case chain and that it was normal. I still haven't fully ruled that out, but here's some more background about what I've done in the last year:
- replaced single speed t-case with 2-speed. Important: I had the same noise before replacing the t-case. So unless it's a normal thing with the magna t-cases, I don't think that's it.
- axle ratio swap, 3.08 to 3.42. Replaced both front and rear entire axle assemblies. Again, the noise was there before and after the swap. so I don't think it's the front diff.
So here's what's left that I think it could be. I haven't changed any of these components since I've owned the vehicle. (and I think the noise has been there since I've owned.)
- front driveshaft u-joints
- CV axles (do these make a hum or howl when going bad?)
- front wheel bearings/hub assembly (I see how they could hum, but it seems like they'd hum all the time, not just when under load?)
Thanks!
I'm getting a hum or slight howl in both auto 4wd and 4-hi. Noise goes away (at least most) when letting off gas to coast or brake. Most pronounced when accelerating. noise stops immediately after switching to 2wd. I've only heard it in the driver's seat so far; I need to ask my son or wife to drive it and let me sit in the back and front pass. I think I'm hearing it up front. At first I thought it was the t-case chain and that it was normal. I still haven't fully ruled that out, but here's some more background about what I've done in the last year:
- replaced single speed t-case with 2-speed. Important: I had the same noise before replacing the t-case. So unless it's a normal thing with the magna t-cases, I don't think that's it.
- axle ratio swap, 3.08 to 3.42. Replaced both front and rear entire axle assemblies. Again, the noise was there before and after the swap. so I don't think it's the front diff.
So here's what's left that I think it could be. I haven't changed any of these components since I've owned the vehicle. (and I think the noise has been there since I've owned.)
- front driveshaft u-joints
- CV axles (do these make a hum or howl when going bad?)
- front wheel bearings/hub assembly (I see how they could hum, but it seems like they'd hum all the time, not just when under load?)
Thanks!
