8 3/4 axle identification

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340dustr

Member
Joined
Jul 27, 2015
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Location
georgetown
Hey there,
My car is a 1970 Duster 340 auto with 8 3/4 diff. I need to replace the pinion seal and the parts guy at the local parts store says there are 2 seals available depending on wether the diff case is a 489 or 741. I checked my case and it is a 742. What seal do I use? Any ideas?
 
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