Totally worth it. You can pick up a used unit cheap. I bought mine for $400.

Here's my install and some links on my page, for my 88 4Runner which would be the same axle as your 4Runner

http://home.4x4wire.com/adamf/88/elocker.htm


88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride