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Hey The pulsing is you ABS brake system working it only pulses when any one of the wheels try's to skid so I would say you are coming to a very fast stop and need to slow down sooner and come to a gentle more slower stop
Automatic Traction Control, or any TC system that relies on looking at individual wheel speed, will always do this. If all four wheels are spinning at the same speed (with allowances for turning), it will shut off. If some wheels start spinning faster than others, it will reduce power to the faster wheels and increase power to the slower wheels with the assumption that the slow ones are gripping well and the fast ones are spinning freely. It takes several revolutions of the wheels, and sometimes more than a second for these decisions to be made.
I don't think you can assess the condition of the transaxle by spinning the wheels. The differential in the transaxle converts power from the transmission to the wheels by a set of gears. It would almost impossible for one side to turn at a different speed than the other. You may have more drag on the brakes on one wheel, or the fluid in the transaxle could cause one side to go slower with the van off the ground.
tmac2scorpi, The inner tie rods will not make any noise whatsoever. What you need to check is the axle shafts coming out of the transaxle. You can do this by having someone walk along the vehicle as you make extreme right and left turns. You may hear the clicking noise that you mentioned here. Right now you state that you hear the noise at certain speeds so it may be hard to hear it when you are going slower with someone walking with the vehicle. If the noise is there then the axle shaft on that side of the vehicle will have to be replaced. Good luck with this.
Do not use 4wd and/or difflock on hard surfaces!!! The seeming effect of braking that you feel is actually what is called drive-train wind-up.(Hard steering should also be felt) What it means is that one wheel on the system is turning slower than the rest of the components and considering all components are connected via metal tubes(over simplified, I know) you can imagine for yourself the effect of holding one end of a tube still while twisting the other end!!! You're going to break something! If your difflock stays engaged even with the button in the "off" postion, try reverse 10 feet then forward 10 feet. If this does not help, have a look at the differential, there is a tube leading into it, disconnect, then reconnect and try again.
it could be as simple as a clutch cycling switch is bad, or low freon. your compressor is at the front left or right( I forget). look at your belts you should have an HR6 compressor(Harrison). is will 1-1 1/2 feet in lenth(cylinder shape). a rebuld will be approx $250-290. A new one will be around $389.00 But have it checked first before spending all that money. simple solutions are always cheaper.