I Give Up - Why an A-904 Rolls A Sprag?

My local shop (with decades of MoPar rebuilding experience) gave me most of my money back today. They can't fix my transmission.

The A-904 in my '61 Lancer has rolled the sprag TWICE.

The second time it rolled the sprag of an AandA Transmission bolt-in sprag kit. http://www.http://www.aandatrans.com/Default.aspx.com

The Slant 6 isn't making more than 200hp, I haven't raced it, I'm not doing burnouts or driving it hard.

It has simply shifted from First to Reverse when in Drive.


Why?:banghead: