I Have Bought A 93 F-150 Supercab 116k, 2 Wd About 3 Weeks Ago, Would Like To Change Out Rear End Fluid. No Idea What Type Of Rear End It Has, Standard, Limited, Or Posive. Jacked It Up So That The Tires Would Spin Free. Rotated Tires Forward And Backwards, Opposite Side Moves In Same Direction. Tag On Rear S836b 3 08 88 3619. Thank You For Your Responce

 

It's a limited slip. Use the additive, even if it says it has it already-it won't hurt.