Can somebody tell me the difference between the Mopar Sure Grip and the Mopar Traction Lock? Do they both perform essentally the same function? ie: turning both wheels the same direction. In case you are wondering, this is for a 9 1/4 rear end. Thank you.

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'56 Chrysler New Yorker St. Regis 354
'63 Plymouth 426 Max Wedge "NoMo-Par?"
'63 Plymouth Valiant 225 Hyper-Pak Wannabe
'68 Plymouth GTX 440
'70 Dodge Charger 500 440
'71 Dodge Demon 225
'71 Dodge Charger Super Bee 383

Go to this link: http://www.ringpinion.com/tech/techind.html

Then click on the link below the bold letters "Carriers, Positractions, Lockers, Spools"

It explains all the types of differentials.