I’d never heard of a Warn Auxiliary Transmission. According to an article from JP Magazine, the WAT was sold by Warn in 1969 and intended to slip between a T-18 and a transfer case. The writer of the article only remembered ever seeing one of them.
“This transmission setup came out of a 70′s International scout. It will come with the Scout bell housing or a Mopar 318 small block bell housing. The transmission shift good as does the t case. The war in overdrive unit shift good and bolts between the T case and the transmission. I am asking 450 but open to offers. Was going to use in a Dodge pickup to get rid of the automatic but my plans have changed.
any questions please call me at 7752250937 or text. Emails are welcome but take longer to respond to. Thank you… Nathan”
I found this ad in the May, 1969, issue of Popular Mechanics.