rears or fronts?
dana 20-d35 are all 1/4 ton rears/front
d44, 8.8's, 9 inch, 10 bolts are 1/2 ton front, and some are 1/2 ton front
d60, 14bolt, 10.25 SF are 3/4 ton rears. d44, 10 bolt, and some d60's are 3/4 ton front
d70, 14 bolt, 10.25FF are 1 ton rears 1 ton fronts are d60, and D70's
IIRC they make up to a dana 110, that size is a rear for 1 1/2 ton trucks. there are also the new AAM axles in new dodges and chevys although there is no aftermarket for them at this time. they are all 3/4 and 1 ton axles