You should be able to spin the gearbox freely by hand when constructed without the pinion attached. If it is tight then it could be a number if things. Badly meshed gears, missing spacer on the layshaft, or the diff is way to tight.
Take it apart and check that everything is seated properly. Take apart the diff and clean it rebuild it. Put some black grease on the thrust race. Compress the diff spring with a pair if pliers a couple if times and take your time to put it back together. Tighten it a bit at a time and checking it by inserting a Allen wrench in each outdrive. Holding them together and trying to turn the pulley. Once it has become very difficult to move the pulley by hand give it a quarter turn more just to be on the safe side. Your diff should feel very smooth and when you turn one outdrive the ithe should turn in the opposite direction.
When you come to putting the gearbox back together make sure you have all the parts in the right place. When you put the long bolts in to hold the gearbox case together and also hold the motorplate in place only do them finger tight, this can stop it binding and also helps to nit strip the threads in the motorplate.
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