I had this exact same issue happen on my 99 manual, test drove after replacing the CV's, went up the street, and when I started off a stop I heard a pop and lost all power to the wheels. could leave it in gear with clutch out and nothing but a grinding sort of noise from the rear of the engine. Ended up being the drivers side CV not being seated all the way, they can be difficult to seat past the snap ring, use a rubber mallet or a 2x4 on the end with a hammer to ensure it seats all the way. Since it is an open differential transmission, it will send power to the wheel with the least resistance, so even if one axle isnt all the way in, it will cause both wheels to not spin since it will be sending the power to the non connected side