Originally Posted by moparx
i'm not disputing your answer, but on the front drive stuff i'm familiar with, it seems more like a powder or an epoxy type of coating. so shruggy
however, you are A #1 spot on about a tiny chip starting the rot process !
i have often wished i had kept several of the front drive pans and differential case covers i have replaced over the years that have rusted through from the outside in. eek
to say they were bad would be an understatement !
beer


The first occurrence of this issue I became aware of was on the 42RLE.
While working on service parts I became aware of the most recent case which involved the NAG trans.

The engineer working on the issue gave me the background to both. E-Coat was mentioned being used and if I recall the acid wash used before the coating was not cleaned enough from the pan.