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Diff-Inner gear shimming

Diff-Inner gear shimming

Old 04-20-2008, 11:40 PM
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Default Diff-Inner gear shimming

How can i know whether the inner diff gears are shimmed correctly?
Is there a way to find out.
I had trouble with one of my diffs...it was working freely but sometimes it was locking and found out that the teeth were barely meshing.
So i removed two thick gaskets and left one thin one to seal the diff...this did bring the gears closer but how can i know i'm at the right spot?
I tried holding the crown gear and one of the diff cups while trying to turn the opposite cup and see the movement...should it be just like the spur and clutch bell movement or more...and how much?
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Old 04-21-2008, 12:41 AM
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Originally Posted by vti-chris View Post
How can i know whether the inner diff gears are shimmed correctly?
Is there a way to find out.
I had trouble with one of my diffs...it was working freely but sometimes it was locking and found out that the teeth were barely meshing.
So i removed two thick gaskets and left one thin one to seal the diff...this did bring the gears closer but how can i know i'm at the right spot?
I tried holding the crown gear and one of the diff cups while trying to turn the opposite cup and see the movement...should it be just like the spur and clutch bell movement or more...and how much?

Keep adding shims ( usually 1 more, or 2 more max ).

How do you know when the gear meshing become too tight ? The gear meshing become too tight when you feel gritty on diff action.

I use more shims in my hyper8 and xray xt8.
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Old 04-21-2008, 12:46 AM
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Do we add shims only on the 4 small gears or we can add the bigger shims behind the two large gears?
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Old 04-21-2008, 12:51 AM
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Originally Posted by vti-chris View Post
Do we add shims only on the 4 small gears or we can add the bigger shims behind the two large gears?
I prefer the large gear get the shim(s) first.
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Old 04-21-2008, 12:52 AM
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Some diffs don't use a large shim...some do use but don't allow more than one...
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Old 04-21-2008, 01:19 AM
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Originally Posted by vti-chris View Post
Some diffs don't use a large shim...some do use but don't allow more than one...
then stop.

in my hyper 8, I can only install 1 more ( 1 side only )

in my xt8, I can install 2 more ( both side ).
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Old 04-21-2008, 01:42 AM
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So as long as the pin goes freely through the diff cup then it should be OK and the diff working fine of course i can add shims???!!!
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Old 04-21-2008, 01:46 AM
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Originally Posted by vti-chris View Post
So as long as the pin goes freely through the diff cup then it should be OK and the diff working fine of course i can add shims???!!!
YES.
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