Firstly take the spool parts and put one of them in a cupboard at home and leave it there ..... that way you'll not be tempted to run it!
That leaves you with 3 options;
permentant 4wd
front diff shaft one-way
front one-way in diff
Permenant 4wd
As Paul says it's a little easier to be able to get the car to jump how you want it too and will be the most consistent option. The downside is that the car will tend towards understeer more than the other options and the transission from on to off power is a little more agressive than with a one-way resulting in a very marked change of line.
Shaft one-way
This gives the one-way effect that allows the stability and turn in under braking. You have a little less control of the nose in the are but the up side is the most progressive change in handling on/off the throttle.
This normally is my prefered option but it needs a very stable chassis to make it work well as you don't have the snap drive of a front one-way or the softness of permenant. If you can have some drag in the assembly (so you get the one-way effect under normal driving conditions but it doesn't run freely ... if that makes sense).
One way diff / front one-way
This has a very positive drive out of the corner and gives the car a "drive from front" characteristic that is either love or hate ... a real marmite option!
The rear of the car will feel like it is just flapping about somewhere behind the front axle from the drivers stand and you'll find that you get the most twitchy characteristics from the car. If you can drive it you will be going very fast but also I personally find it is the option most likely to get away from you and the rest of your set-up and your lines have to be spot on!! I try to avoid it if possible.
Hope that helps.
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