Leaking and clueless!

That leak is a common problem for the PreRunners.
OP here is a link to the thread with the TSB and part number for the new redesigned seal : http://www.tacomaworld.com/forum/2nd-gen-tacomas/45728-new-tsb.html

 

Thanks for the info...i would have never found it

 

That might just be the only seal on the 05 AC Prerunner that didn't leak & was never replaced, lol. Every other possible one had to be replaced using drivetrain warranty. The pwr steering rack I had to cover. The 08 RC Prerunner has had none of these issues......knocks on wood.