all 4 speeds have a "tripod" style where the halfshaft connects to the trans and the 5 speeds have a CV joint. the four speed should have holes to insert the shafts where the 5 speed has a hub that the CV bolts onto
The extension housing is the left-most cover in the picture above. If the cover is pretty much flat, it's a four speed. If it's about 4 inches tall, as above, it's a 5 speed. That's were the fifth gear is added.
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