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· RIP 12/21/22
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It's a 3/8" standard thread bolt. Just use a 9/16" socket and ratchet to remove one of the front differential mount bolts from under the bottom of the front differential right beside where you lost the one in the a arm. There are 4 of them in the differential so borrowing one doesn't matter. They are the exact same bolt. Use a little blue Loctite on the threads and hold the bolt on the other end of the a arm with a wrench to keep the pivot shaft from turning when you install it.
Put your a arm back together and go riding! You can replace the differential bolt later with the new one when you get it.

**Oh yeah...better check all the others front and rear too. Really bad (and dangerous) design by Polaris for a arm attachment. I've done a write up in the past about how to fix this permanently.
 

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2005 Polaris Magnum 4x4
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It's a 3/8" standard thread bolt. Just use a 9/16" socket and ratchet to remove one of the front differential mount bolts from under the bottom of the front differential right beside where you lost the one in the a arm. There are 4 of them in the differential so borrowing one doesn't matter. They are the exact same bolt. Use a little blue Loctite on the threads and hold the bolt on the other end of the a arm with a wrench to keep the pivot shaft from turning when you install it.
Put your a arm back together and go riding! You can replace the differential bolt later with the new one when you get it.

**Oh yeah...better check all the others front and rear too. Really bad (and dangerous) design by Polaris for a arm attachment. I've done a write up in the past about how to fix this permanently.
I know this is old....
So that would be a 3/8-16 and about 1" long thread?

And can you give a link to the fix? Please.
 
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