Did you see this thread on pirate?

http://www.pirate4x4.com/forum/showthread.php?t=787561&highlight=

This is something to consider, I don't think it is an issue on the taco rear end, as much as it is on e-lockers swapped into IFS rear housings. You can check how much spline engagement it getting by putting grease on the splines an test fitting it. The housing is extremely easy to gusset.