Quote:
Originally Posted by Jackedup4runner
Yah. Does it in all speeds. Sound slows with vehicle speed slowing. No change in sound in neutral. No change with manual shifting. No change in 4hi. I would have to say sound started after the destruction of my front diff from 4wheelparts poor install job. The truck has a fabtech 6” lift so yes it has a diff drop. No harsh angles on cv axles or drivelines. With front end jacked up i have no sounds when spinning tires by hand. No play in wheel bearings. I recently changed tcase front output oil seal as it started leaking (sound was already happening). Removed front shaft and drove in 4hi just to see if it was related to front shaft. Sound/vibration was still there, but with front shaft in seems more magnified. Changed ujoints when i pulled front shaft out just because. As posted b4 the gears where changed to 4.56 with arb lockers. The 4runner is a limited, which is awd/full time 4wd or which ever u prefer to say. So always power to front diff. Im wondering when my front diff went out, and locked up if it damaged something else in the drivetrain. Which im assuming it did. Tcase oil was clean when drained for the seal replacement. The diff oils were a bit dark, but no metal chunks or shavings came out in oil.
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Based on your post, it has to be tires, wheel bearings. My bet is tires/balance.
If the noise does not change in AWD vs 4Hi, then it has nothing to do with your front diff as it is not engaged during normal highway cruising.