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post #1 of (permalink) Old 02-03-2004, 03:55 PM
ZeroZ400
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Grinding noise

My friend was doing donuts in his CJ7 and hit a dry spot with his right rear, it made a loud grinding noise. Now when he floors it you hear the noise. Any idea what this is and how to fix it?


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post #2 of (permalink) Old 02-03-2004, 04:25 PM
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Re: Grinding noise

Just a guess, but sounds like he has the AMC MODEL 20 rear end with the two piece axles. If so, replace axles with the aftermarket one piece ones. What happens is the wheel mounting surface strips out and the axle is actually spinning inside the hub. I don't know if the wheel can actually fall off, but I wouldn't drive it until someone with more knowledge about them pipes up.
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post #3 of (permalink) Old 02-03-2004, 07:03 PM
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Re: Grinding noise

Likely damaged the axle bearing or spun the hub on the axle. It could go deeper into the diff. but the weakest part normally breaks.

There's no great way to see that you spun a two piece axle if you have an open diff. without taking it apart.

</font><blockquote><font class="small">In reply to:</font><hr />
Dana 20 rear end with the two piece axles

[/ QUOTE ]

Dana 20 = AMC 20 axle

Good Luck
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post #4 of (permalink) Old 02-04-2004, 08:27 AM
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Re: Grinding noise

</font><blockquote><font class="small">In reply to:</font><hr />
In reply to:
--------------------------------------------------------------------------------

Dana 20 rear end with the two piece axles


--------------------------------------------------------------------------------



Dana 20 = AMC 20 axle


[/ QUOTE ]

Dana 20 does not equal AMC 20. Dana 20 is a transfer case. AMC 20 is an axle.
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post #5 of (permalink) Old 02-04-2004, 10:10 AM
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Re: Grinding noise

Jeez, I don't know what you guys are talking about. Who would ever call a Model 20 a Dana 20. Certainly not me [img]images/graemlins/grin.gif[/img]

Edits are a beautiful thing. That's why I told him to wait for one of the experts.
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post #6 of (permalink) Old 02-04-2004, 11:32 AM
 
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Re: Grinding noise

</font><blockquote><font class="small">In reply to:</font><hr />
My friend was doing donuts in his CJ7 and hit a dry spot with his right rear, it made a loud grinding noise.

[/ QUOTE ]


Hmmmm, funny thing I seem to remember that exact same thing happening to me, right before I got 1-piece axles. [img]images/graemlins/grin.gif[/img]
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post #7 of (permalink) Old 02-04-2004, 10:14 PM
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Re: Grinding noise

Its most likly a stripped spline
post #8 of (permalink) Old 02-05-2004, 07:00 AM
 
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Re: Grinding noise

"I don't know if the wheel can actually fall off,"

If the hub has separated from the shaft, it can indeed fall off. However, when my model 20 axles went, it was with a jarring POP! followed by complete immobility. The key that held the hub to the shaft was shredded into scrap metal. [img]images/graemlins/blush.gif[/img]
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post #9 of (permalink) Old 02-05-2004, 07:21 AM
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Re: Grinding noise

Older MODEL 20 axels didn't have a key. They had serrations, like very fine splines, in the hub. When the nut tightened down it pressed the hub onto the smooth taper of the axel shaft with enough force that the serrations were pressed into the shaft. That plus the jamming together of the tapers was enough to keep things from spinning. Mostly.

The hub won't fall off, because the washer, nut and cotter pin are still there. But if the spinning hub galls to the washer, which galls to the nut, it could shear the cotter pin and wind the nut off, and bye bye wheel.
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