Join Date: Feb 2001
Location: New Mexico
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Re: Jeeps rear axle width?
Some info that you might be able to use. CJs from @ '73-'75 have a Dana 44 with a centered diff. I have one out of a '73 that measures 51" wheel mounting surface to WMS. Ratios were 3.73 or 4.27. This axle is considered to be pretty stout, good housing strength, good 1 piece flanged axles. CJs from @ '77-'79 use a corporate model 20 axle with a centered diff, ratios were 3.54 or 4.09 commonly. Again @ 51" WMS to WMS. The model 20 has a larger ring gear than the 44 but the housing is not considered to be as stout and it has 2 piece axle shafts that many people replace with 1 piece flanged axles to improve strength and reliability. The following letter codes pertain specifically to the model 20 and may or may not be accurate for the 44.
N = trak-lok diff with 3.54 gears
M = trak-lok diff with 4.09 gears
A = open diff 3.54 gears
L = open diff 4.09 gears
A trak-lok diff is a clutch type limited slip diff. Bolt patterns are 5 on 5 1/2 for the CJ axles. I may be off by a year on the model years but it'll get you in the ballpark. I think in '80 ('80-'86) CJs went to a "widetrack" axle that is about 6" wider. If you need more info post on the short wheelbase forum and the folks there will give you tons of info about Cj axles.