Quote
my wife and I run duals with the 4.7 in the rear case.
21 spline. that way if anything breaks I can easy grab a stock one and put it in on the trail.


That doesn't make much sense since
1) your spare stock input won't work with the 4.7's you have in your rear case, and
2) the rear (second) input is the one most likely to break since it is subject to much more torque.


And personally, I wouldn't consider pulling and tearing down a t-case on the trail "easy"... <img src="/forums/images/graemlins/shiner.gif" alt="" /> (especially on my rig) but yes, if you have dual STOCK cases, its a cheap, small part that's not a bad idea to carry as a spare (and hope you never need).

'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik