It is not on line yet. (unless you have an online subscription) Page 70-74 October 2012 Car Craft Mag. The jist is using a non crushable sleeve in he 489 case by Ratech. PN 4103. $33 RatechMFG.com 513-742-2111 Then shim it as if it were a 741,742 diff. They lucked out and built one out of 2 for < $400! Marc.
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She'll start; You'll need these...