all the 5 speeds with a removable bellhousing are about the same length. the only shorter toyota 4x4 tranny with a removable bellhousing is the L43 that was used in '79 and '80 trucks, it's 4" shorter alltogether than an aluminum 5 speed. i believe the case itself is only about 8" long or so, but it has a long tailhousing adapter since it's originally a light duty 2wd tranny
here's some more info:
http://www.marlincrawler.com/l43_trans.html