Was looking for the Carrier Break point for a gear swap and found this from RANDY'S RING AND PINION.
Very good info for any one looking for new gears and wanting to know when you need to swap out Carriers and what Spline counts you will need for new Shafts.
Also tell you what the axle was used in and what time frame it was used.
Covers all of these.
AMC
Chrysler
Dana Spicer
Ford
GM
Isuzu
Nissan
Rockwell
Suzuki
Toyota
http://www.ringpinion.com/DiffTypes.aspx (http://www.ringpinion.com/DiffTypes.aspx)