8.25 differential casing ID

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273 Commando

mooser's dad
Joined
Dec 27, 2008
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San Jose, CA
I bought an NOS sure-grip differential on eBay for my kid's Duster. These are from a lot of old stock and loose and unboxed, therefore no part number. However,they are marked on the case with the number 18-05-039-903. Please tell me this is the correct size case for 3.21 and lower gear ratios! The price was too good to pass up, so I jumped prior to researching it.

We're thinking of dropping in 3.55 or 3.90's. I hope this will work.
 
The sure grip assembly I have on my bench has the same numbers on the case. It came with a 3.21 ring gear on it and I just switched to 3.55's
 

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