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Old 07-18-2010, 08:18 PM   #1
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shifting into gear, axle noise

When I go into any gear, stopped at an intersection, I hear a thud in the rear axle. During seal replacement at PassRear wheel, noticed play in side gear/pinion shaft/pinion gears to each axle.

Would replacement of these gears relieve this clunk/thud noise?

Would replacement of these gears then cause another issue requiring the ring/pinion to be replaced because they're no longer all evenly wearing together?
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Old 07-18-2010, 10:00 PM   #2
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Re: shifting into gear, axle noise

Have you checked you Ujoint?
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Old 07-18-2010, 11:02 PM   #3
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Re: shifting into gear, axle noise

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Originally Posted by 91sleeper View Post
Have you checked you Ujoint?
Cursory glance didn't indicate any leaking, no. When I replaced the clutch at 60k, I did mismark the U-joint relation to the drivetrain. Making a best guess, I thought I'd reconnected them properly. It is possible that I did not however.

If you believe that's my culprit, I would entertain it. So, either I just put up with it, or have the joint replaced?
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Old 07-18-2010, 11:08 PM   #4
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Re: shifting into gear, axle noise

U-joint leaking? No reason it would. Put the car on jack stands and put the car into a gear. Twist you driveshaft and see if you can head the noise. Also rock the wheels back and forth and see if you can hear it as well. Dont just replace parts till its fixed thats wasting money. Pin point the problem and fix it. Also while you are under there look at the transmission mount as well.
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Old 07-18-2010, 11:16 PM   #5
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Re: shifting into gear, axle noise

Oh yes it's definitely the play in the side & pinion gears. Rocking the axle pinpoints is precisely. Obviously those parts have all worn simultaneously, so my question was that if I replace just those (omitting the ring&pinion and gear) would the problem be resolved? Or would the slack/gap just move to the gear or ring&pinion?
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Old 07-18-2010, 11:23 PM   #6
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Re: shifting into gear, axle noise

what side gear are you refering too
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Old 07-18-2010, 11:27 PM   #7
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Re: shifting into gear, axle noise

Ford actually calls it a "side gear". It's in the differential case assembly. These side gears are visually a top/bottom gear, with holes in the center for the pinion shaft. Those gears have some slack/play when you manipulate the axles. I believe it's that play which I'm hearing while driving the car. It'd be "nice" to get rid of it, but not required.

Oh, and these side gears then connect to the gears for each wheel's axle.
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Old 07-18-2010, 11:37 PM   #8
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Re: shifting into gear, axle noise

I am with you now.I have always called them spider gears.

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Old 07-19-2010, 12:05 AM   #9
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Re: shifting into gear, axle noise

Yes. Those four inner gears. My post is aimed at asking if replacing them would:

1) Resolve the clunk/thunk noise from the rear axle
2) NOT cause the issue to move to either the drive gear, nor the ring&pinion
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Old 07-19-2010, 12:08 AM   #10
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Re: shifting into gear, axle noise

I would check the trans mount and the U-joint first.
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