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 It should say on the tag if its posi or not. It will go somthing like this for 3.08 gears:  3 L 08.  If theres no L its not a locking diff. 
				__________________93LXcopcar SOLD14.3@96 @ 4500ft 2.02 60ft on street tires.
my 67 ranchero  NOT A 390 ANY MORE! 460!  3.70's cast manifolds, comp cams 262H, performer, 750DP 100K out of 79 F250 
NEW(oct20/02)14.58@95mph 2.3 60 ft 
corrects to:13.86@100
66 merc comet 351w, isky roller 600 lift 268/260@.050, vic jr. 700DP, 5000stall, 4.56's c-4, 3400lbs with driver 
12.3@110 @ 4000ft 1.69 60 ft 
corrects to:11.69@115
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