cracked a ring gear bolt
Looks like you received a defective bolt, as I installed hundreds without a problem. It is a grade 8 specialty fastener made by a supplier to Dana/Spicer. It is/has been branded as, or included in Motive, Richmond, Yukon and other rebuild kits.
I installed 3 sets earlier this week and I tested another set this morning with a new torque wrench. All torqued to 55 ft lbs. and none felt "spongy".
I just looked up the transaction and refunded you $20 via PayPal for the value of the bolts.
Cass