Quaife 6 speed conversion kit.
ACN code tranny as a pretty tall fifth from late 80s early 90s gassers
I found these = maybe an alternative to a 6-swap. Pricey but cheaper than a swap. I think the .681 will be my choice.http://www.kermatdi.com/servlet/-strse-Transmissions/Categorieshttp://www.tdiparts.com/catalog/index.php?cPath=76_102&osCsid=78tobr9jjk6kjbhb510g5f4df2