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I picked up a 741 open chunk with a new 3.23 and wondering if the ring and pinion is the same as on the cone style sure-grip?



All the 8-3/4 rears have interchangeable SG units (clutch or cone). The gears won't interchange. The 741 is a small diameter straight pinion, 742 is large straight pinion and the 489 is a large tapered pinion that uses a crush collar for preload.