What LSD do I need?

[TJCOLD]

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.

 

[melsg5]

Read this article

https://www.hemmings.com/stories/article/b-o-p-rear-axles

This link is for codes

http://www.wallaceracing.com/axledata2.htm

 

[TJCOLD]

Read this article

https://www.hemmings.com/stories/article/b-o-p-rear-axles

Thanks brother

 

[TJCOLD]

Read this article

https://www.hemmings.com/stories/article/b-o-p-rear-axles

I read that article already. Doesn't do much in helping me figure out out honestly.

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[melsg5]

It clearly stated 28 spline

 

[TJCOLD]

It clearly stated 28 spline

Thanks, I read it to say 27 or 28 spline.

 

[melsg5]

Thanks, I read it to say 27 or 28 spline.

Reread it carefully 27 spline pinion, 28 spline axle

 

[TJCOLD]

Reread it carefully 27 spline pinion, 28 spline axle

Yeah I saw it that time. Appreciate all the help.

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[melsg5]

Sample lsd

https://www.summitracing.com/parts/yga-26024/make/pontiac/model/lemans/year/1972