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I am having noise from my transmission, and want to get it rebuilt for the most part.

Looking at getting a bearing/seal kit, but I've run into an issue.

All of the kits I find ask if I have an 18.5mm or 20.5mm rear pinion bearing.

I have zero clue how to figure out what I have, and the most technical skill I have is that I change my own breaks and oil.

Can anyone help a guy out?

There is some numbers stamped on my tranny, here they are if they help: 5W172618

Sorry if I'm not in the right forum area, I've never really done this before. Thanks for any help!
 

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Shouldn't the person rebuilding your transmission know? Where are these kits from? All google brings up is rear diffs but they both have gears so:unsure: What are you searching for in particular when you get those prompts asking you about the size?"transmisson rebuild kit"?
 
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