What LSD do I need?

TJCOLD

New member
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Question for the more experienced guys. How can I determine what number of splines I need for my differential without disassembling it. I'm just looking to swap in a LSD. Thanks in advance.

1972 Lemans Luxury
Attached a photo of a number I found on the cover. It looks to be a 10 bolt.
20210101_233538.jpg
20210101_134546.jpg
 
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