A number 8 on the top in the casting of this Allison I picked up? Is a no. 8 a five speed???
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Look at the ID plate on side of case, if it shows 16-1751 or 1792 it's a 5 speed. If it's 16-1818, or the tag is black it's a 6 speed.
I always look for internal or external NSBU.
So you would be fooled if someone took the NSBU off a 5 speed.
So you would be fooled if someone took the NSBU off a 5 speed.