Axles- Ranger/F-150 have 31 splines??? can soemone help me on this

[Rick 91GT]

I remember seeing a topic that stated you can get 31 splined axles from a 7.5" Ranger rear, but you need 2 drivers side. Then I saw another state that some year F-150 came with 31 splined axles and heavy duty 31 spline trac-locs. Can someone tell me if this is true and what years to look for. A local salvage yard is having a huge sale and I thought I might try to see what I can get...

Thanks

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