You will end up with a little more drive line slop with a FF, but not enough to drive you nuts over. I had to adapt a Warn FF for a Jeep to my Dana 44 to get one, but my main reason was to be able to flat tow without spinning my expensive diffs and tranny. After about 100,000 mies driving & 50,000 miles of flat towing I wore out my Factory Isuzu tranny, hence the Malin dual boxes.
There is another benifit to having FF rear axles. It's a long story but basically I had a seal tear on the axle and was slinging oil everywhere. All I had to do was pull that axle and put in a rubber plug to stop the oil from running out. Then I locked up the rear ARB and drove it to The Marlin Rubicon Roundup 1500 miles on the left axel. I was the (dark blue Rodeo sitting on the hill under the tree.)(Yep, Got the long distance award for that one.)
My plans are to cut another set of axels for spares before next summer. They store easy.
But like the guys have said, you don't see many busted Toy axles on the trail. So the overkill is your choice if all you want them for is the flexibility and keeping the wheel on if you snap one. Had I seen the Front Range kit before I bought the Warn I would have gone with them. They are already the same bolt pattern and the bearings are the same as the Toy fronts. Live and learn.
My $.02
CJ <IMG SRC="smilies/tongue.gif" border="0">