Is this a 4WD only part, or would it be a wise idea to get one for a 2WD, too?

Any tips/tricks on loosening those bolts. Man, they are on there solid.

Thanks,
The mechanically challenged one.

douche 'em good with wd40, than a cheater bar on the end of your wrench'll bust 'em free. If that fails, check into a fitness regime at the local gym..

Both the 4wd and the 2wd have idler arms and idler arm braces from both SLR and CALMINI are universal for both 2 and 4wd.

SLR idler arm brace on 2wd:

Just make sure when you install the IAB that you don't try to re-use that big washer. I tried to and it doesn't work with the Calmini IAB.