70 Challenger R/T 383 Magnum Rear End ID

[3.0CSL]

Not sure what rear axle is fitted, as the fender tag is missing. Is there a code tag on these axles ?

[anlauto]

If you look at the ten nuts retaining the center section to the housing you may find the original tag, it's small and could have rusted off by now. likely 3:23

[3.0CSL]

Thanks. Is there any way of knowing if it's a Posi ?

[JH27N0B]

Unless someone installed a GM rear axle in your car it isn't a posi! 
Lacking the build sheet, the only ways to tell if you have a sure grip Mopar rear end are to either pull the gear housing and look, or jack up the rear of the car with the trans in neutral and rotate one tire and see if the other side tire turns.

[3.0CSL]

Unless someone installed a GM rear axle in your car it isn't a posi! 
Lacking the build sheet, the only ways to tell if you have a sure grip Mopar rear end are to either pull the gear housing and look, or jack up the rear of the car with the trans in neutral and rotate one tire and see if the other side tire turns.

Ha, here in Blighty we call it an LSD, so apologies re Posi ! Was thinking of my 68 SS 427 Camaros rear end!
The left rear brake is seized on, il have another go @ freeing it off.