Join Date: Mar 2003
Location: Fairbanks, Alaska
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You don't want that kit. It is for a TJ and uses a 5 on 4.5" bolt pattern. As Jim said the axles will be to long and have the wrong splines as well. The locking hubs that kit uses are similar to those used on the front of Bronco II's, and are weak.
The CJ AMC 20's used smaller bearings then the Heavy Duty 20's used in Wagoners, Full size Cherokees and J10s. So you will need a Kit for a CJ AMC 20 for it to be bolt in.
I know of 3 different types of CJ AMC 20, All of which had kits made for them.
The only difference being axle length. These are: Narrow Track, Quadratrac, and Wide Track.
Narrow track ran from 76 to 81 or 82ish. The differential was roughly centered. Width from Wheel mounting Surface (WMS) to WMS was about 51".
Quadratrac was used from 76 through 79, and had the differential noticeably offset to the passengers side, overall width was the same as narrow track.
Wide track ran from 82ish to 86 and was the same as narrow track except about 4" wider.
Keep looking and The right kit will turn up.
I will start using Metric only when the duodecimal system is adopted!!