V6
E-locker
They even use the same gear sets. The one with the trusses is the tacoma without the e-locker. As far as I know the only factory traction device for the 8.4" is a limited slip. The one with the trusses is actually also an 8" ring gear but uses a different gear set than the earlier diffs. Many people call it a 8.4" to make identification easier.
