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Wide-track vs. Narrow-track Differences
One of the most asked questions about Jeeps is what are the differences between the wide-track and the narrow-track setup for Jeep axles. Below is a list of comparable differences that you can see technically with what they came stock with. Yours might differ if it has been "upgraded", but in stock form, the differences are listed below.
            Wide-Track           Narrow-Track
Years Produced 1982-1986 1972-1981
Hubs - Dana 30 5-bolt 6-bolt
Width - Dana 30 56" 53"
Disc Brakes - D30 10-1/2"x7/8" rotor(79-86) 10-1/2"x1-7/8" rotor (76-78)
Disc Mount - D30 2-bolt(79-86) 6-bolt(76-78)
Gear Ratios - D30 Common: 2.73, 3.54 Common: 3.54, 3.73
Width - AMC 20 54.5" 50.5"
Drums - AMC 20 10x1.75" - (post 1978) 11x2" - (pre 1978)
Gear Ratios - M20 2.73, 3.31, 3.54, 3.73, 4.10 2.73, 3.31, 3.54, 3.73, 4.10
Dana 44
Dana 44 Axles also came in the wide-track and narrow-track varieties as well. They were common on SJ models more then CJ models so that is why they aren't included in the above statistics. Narrow-track Dana 44's were common on the 1955-1975 CJ models. In 1986 they offered the wide-track variety on the CJ-7 due to a lack of AMC 20 axles in the last production year of the CJ-7. Not all gear ratio varieties listed above were common for Dana 44 axles. The R&P ratio ranges supported by the carriers are 2.87-3.73 and 3.92-5.89.
This list is still being compiled and will continue to grow, if you spot something that is not quite right, please let us know.

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