I need some help figuring out what the hell it is. I'm asking here in particular because I've read about the front cone gear in the t-case being funny. See videos in following links. The noise coming and going is from me accelerating and letting off the gas, respectively.
https://photos.app.goo.gl/WdtjolimhjeLC3a02
https://photos.app.goo.gl/9LP0a14QWypU3nTQ2
Symptoms-
-only under load/acceleration. As soon as I let off the gas, it stops. So I don't hear it when coasting, deceleration, or just maintaining same speed.
-both 1st+2nd gear (probably 3rd too, but it's hard to hear and less torque)
-it doesn't really happen when turning, even in 4wd on dry pavement under tons of load. This leads me to think it's not related to the t-case, but what do I know.
-the sound is kind of a light metallic rub/squeak (not grinding, not high pitched squeal like a belt)
-it does have a rotational frequency, which seems to get more steady the harder the acceleration
-it seems to have started and gotten progressively worse in the last few months (maybe 200 miles)
-i drove around for a little bit in December with no front driveshaft, and never noticed the noise. But that was when I assumed the noise was from the driveshaft rubbing the exhaust x-over.
Stuff I've done/checked
-ive poked around at the engine and mounts, but I don't see any issues there
-i thought it was exhaust on front driveshaft, but I rerouted it. No change
-thought it was exhaust rubbing on frame where it's squished next to transfer case. Pretty much ruled that out.
-ive done all the u-joints on the front driveshaft. No change
-diffs and t-case have good fluid.
As I write this, I'm thinking it's got to be something in front axle or front output of t-case. But I'm still perplexed.
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