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Guys, I'm a novice and trying to find out what diff I have in my GTO. It is a ten bolt.
I can only find numbers on the rear of the diff. I can't see any numbers on the axle tubes or tags on the brake backing plates.
The digits on the diff are...
K188
9795082
(I think) photo attached.
Thanks
Jim
20200602_110740.jpg
20200602_110810.jpg
 

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Those are the date code when produced and the casting number of the diff housing. They have nothing to do with the gear ratio of the diff.
 

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The axle tube is stamped with a 2-letter code which can ID the gear ratio. It will be a couple inches out from the center section stamped somewhere on the axle tube. You may have to really clean/ wire brush, or greenie pad the area to find it. Took me a while to uncover mine and I didn't think it had one as well.
 

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If you can't find the codes - you can always figure it out by putting it on jack stands with the car in neutral and count the # of revs the driveshaft makes for one rev of the tire.
 
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