Rear end axle differential diff ujoint noise
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Rear end axle differential diff ujoint noise
.
Loud roaring / grinding on acceleration only.... Noise from the rear axle
back story>>> I recently purchased a broken 1996 Tacoma Extra Cab 4-wd (175K).
After repairing the left knuckle / tie rod / CV / brake line / strut from associated damage (ball joint failure / bolts backed out), I then was able to take my first drive. Immediately I noticed that the rear end was howling VERY loud (cant drown it out with the stock radio kind of loud).
So is it bad ring and pinion or U-joint... ???
I pulled the drive shaft and it looked dry, not greased, but not too bad. Rear pinion has a beard of fresh gear oil, never a good sign, but usually just a plugged rear axle vent causing pressurization / relief (as the axle heats up) through the pinion seal. Both rear end and drive shaft look abused / no service. Back lash is a little excessive but not uncommon for 175K. Pinion bearing stilll feels tight.
Later a second inspection of the drive shaft revealed the rearmost joint at the axle was a little stiff and might have a slight bit of play (neither are good). New Moog super duty U-joint is only $25. Koyo / Matsuba are the preferd brand ~ but at 8pm Friday night Moog will do just fine.
I pulled the old joint down to find this.... V V V V V V V V V V V
Looks like the needles got dry and began to wear. The diminished size turned them sideways slightly and they then became more of a bushing than a bearing. Ribbed / 30 spline U-joints are bad. This noise could have been amplified by the drive shaft tube mimicking a bad gear set. Will find out tonight if this was the only issue.
Loud roaring / grinding on acceleration only.... Noise from the rear axle
back story>>> I recently purchased a broken 1996 Tacoma Extra Cab 4-wd (175K).
After repairing the left knuckle / tie rod / CV / brake line / strut from associated damage (ball joint failure / bolts backed out), I then was able to take my first drive. Immediately I noticed that the rear end was howling VERY loud (cant drown it out with the stock radio kind of loud).
So is it bad ring and pinion or U-joint... ???
I pulled the drive shaft and it looked dry, not greased, but not too bad. Rear pinion has a beard of fresh gear oil, never a good sign, but usually just a plugged rear axle vent causing pressurization / relief (as the axle heats up) through the pinion seal. Both rear end and drive shaft look abused / no service. Back lash is a little excessive but not uncommon for 175K. Pinion bearing stilll feels tight.
Later a second inspection of the drive shaft revealed the rearmost joint at the axle was a little stiff and might have a slight bit of play (neither are good). New Moog super duty U-joint is only $25. Koyo / Matsuba are the preferd brand ~ but at 8pm Friday night Moog will do just fine.
I pulled the old joint down to find this.... V V V V V V V V V V V
Looks like the needles got dry and began to wear. The diminished size turned them sideways slightly and they then became more of a bushing than a bearing. Ribbed / 30 spline U-joints are bad. This noise could have been amplified by the drive shaft tube mimicking a bad gear set. Will find out tonight if this was the only issue.
Rocking everyone's favorite
The infamous Trail Master 6" suspension lift.
The infamous Trail Master 6" suspension lift.
Last edited by Whitfield; 02-28-2015 at 07:39 PM.
#2
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Noise is gone! The roaring / grinding on acceleration was the rear u-joint.
Further inspection of pinion with drive shaft installed reveals that it does have slight lateral play. This will need to be addressed but so far it is not a deal breaker. Hope to measure it soon with a mag base dial indicator to quantify the number.
Further inspection of pinion with drive shaft installed reveals that it does have slight lateral play. This will need to be addressed but so far it is not a deal breaker. Hope to measure it soon with a mag base dial indicator to quantify the number.
Last edited by Whitfield; 02-28-2015 at 07:40 PM.
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