*Note* This information was taken from a member on Jeep Forum.
1974-1979 Full Size Jeeps:
Front Axle:
Passenger Side Drop
Dana 44 (6-lug) or Dana 44 HD (8-lug)
The 6-lug axle comes in both narrow and wide versions (Wagoneer is narrow, J-truck and Cherokee Chief* is wide)
The 8-lug is wide only
1974-1975, disc brakes were optional in these years. In 1976, disc brakes became standard on the front. (EDIT!! They were still optional in 1976!)
Rear Axle:
Dana 44 (6-lug) or Dana 60 (8-lug)
The Dana 44 comes in narrow, wide and wider. (Wagoneer would be narrow, Cherokee Chief* would be wider and J-truck would be widest)
All of the Dana 44's are offset, some are offset less but all are offset
The Dana 60 is widest only and is a little off-set
1980-1985-ish Full-Size Jeeps:
Front Axle:
Driver Side Drop
Dana 44 (6-lug)** or Dana 44 HD (8-lug)
**1982-1984 (6-lug only) could have a vacuum disconnect front axle - I have seen some 1985's with this as well.
Rear Axle:
AMC 20 (6-lug) or Dana 60 (8-lug)
AMC 20 (6-lug) offset just a tad. This is much stronger than the CJ versions. This axle has 1-piece axle shafts stock and the tubes are thicker for use in the heavier Full-Size Jeeps.
AMC 20 Axles come in narrow, wide and wider. (Wagoneer and Grand Wagoneer would be narrow, Cherokee Chief* would be wider and J-truck would be widest)
Dana 60 Rear offset just a tad and comes in widest.
1986-1991 Full-Size Jeeps
Front Axle:
Driver side drop
Dana 44 (6-lug) or Dana 44 HD (8-lug)
The 6-lug axle comes in both narrow and wide versions (Grand Wagoneer is narrow, J-truck is wide)
The 8-lug is wide only
Rear Axle
Dana 44 (6-lug) offset just a tad
Note, some early 1986's have been spotted with an AMC 20 rear axle.
Comes in narrow and widest versions (Grand Wagoneer would be narrow, J-truck would be widest)
*Cherokee note: Some 1974-1983 Cherokees can either be narrow or wide. This link will help break this down:
http://www.bjsoffroad.com/cartgenie/....asp#Widetrack 
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