Yes, about mid production year dealers were experiencing blown rear coming in under warranty. Almost all were 4speed commando cars. MaMopar relented and sent out a message to the dealers that under warranty replace the 7.25 to 8.5 when available. Following that NHRA changed the rules for stock/Super Stock and allowed the 4speed cars to run the 8.5. I’ve posted copies of those letters off and on over the years. I’ll have to dig them up again.
