hmmm it used to be on the parts list page. I know they still have them because I almost bought another one before I decided to do my NV4500 conversion a few months ago. Call Dave...they are $650 I had one on my bombed 24v and was very very happy with it.

 

Sounds like yours will be just like my rebuild, I have the line pressure turned up for "Modified engines" and it shift pretty firm. I've towed with mine and it does great. I just flushed the stock cooling system out and went with that, the highest temperatures I have yet to see is 135 - 140ish sitting in traffic, but other than that it will be a hair above 100 running down the highway. You'll be happy with it, if you dont have crazy power.

Dave