My 07 Rincon's owners manual doesn't say whether or not you can shift into 4x4 while moving. It seems to work ok, but I would like some advice from anyone that knows for sure.

Also, does the front and rear differentials on my Rincon and Rancher 420 lock up or are they posi, limited slip or open?

 

Going in or out is ok while moving. You may need to back off the throttle for it to occur, but when the load comes off the shafts, itll switch in or out.
The rear is a spool, no differential action at all.
The front is a torque sensing type differential. It transfers the torque to the tire that needs it...providing there is some resistance on the other tire. In other words, if one front tire gets airborne, like climbing over a log, that airborn tire wont have any resistance to spin, and no torque can transfer to the other tire. To get the torque to transfer, just start clamping on the front brake, while lightly spining the front tire, and then the torque will transfer. Its the same design as used on land rovers, and works very well, and nothing to wear out, and no fancy lubes or additives are necesary.

 

Hondabuster is right and yes you can shift into 4x4 while moving as long as the front is spinning as fast as the rear. Just dont go on ice or snow while spinning the rear and put it in 4x4. In this case you stop but otherwise you can shift while moving.

 

If I recall correctly, the computer uses speed sensors from both axles to only complete the shift when their speed is similar, but I still wouldn't flip the switch while doing a burnout.

The front dif works OK in most situations, but there does seem to be a bit of a delay. At least I've been in situations where if you stay on the throttle while it's bogging down, when 3 tires have dug themselves holes it finally sends power to the front wheel that had traction, but by then it's already stuck... It works, but not as well as a locker.

 

yeah, you can shift it while moving as long as all the wheels are moving the same speed. If you're stuck though, and you are spinning the rear tires and the front ones are stopped, you'll have to let off the gas and stop the tires with the brake before you shift into 4x4.