rcomm3 Posted February 3, 2016 Share Posted February 3, 2016 I was looking my 1985 Jeep CJ's amc 20 rear axle today and realized that there is no fill plug on the cover. How do you put any fluid in it after draining it? l'm definitely NOT an expert at this. Your advice? Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted February 3, 2016 Administrators Share Posted February 3, 2016 rcomm3...You're welcome...For checking or filling the AMC 20 rear axle with lube, look to the side at the front of the iron center section. The center section casting has a fill plug (tapered pipe thread type). Post a quick cell phone pic of the fill plug to help others find the plug...Check the gear oil with the vehicle at normal curb height on flat ground or with the axles supported and level. Filling to the lower level of the fill plug's threads is plenty. If the Jeep is lifted with a CV rear driveline and pinion rotation upward, the plug will be raised, and the oil level rises. The factory recommended refill amount, after removing the cover and draining the lube completely, may not be adequate. Many 4x4s with a pinion rotation run with gear lube adjusted to the raised plug opening . As long as this does not create a seal or venting/overflow issue, that's fine. The main concern is adequate lube to the front and rear pinion bearings and the differential carrier bearings.Let us know how this works!Moses Quote Link to comment Share on other sites More sharing options...
rcomm3 Posted February 4, 2016 Author Share Posted February 4, 2016 Here are the pics of the rear diff. Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted February 4, 2016 Administrators Share Posted February 4, 2016 rcomm3...Thanks much for taking time to photograph, very helpful! Lower photo catches the fill plug, facing forward below the casting flange...Use care loosening the plug, if ultra-tight, it can round out when force is applied. If worn or questionable, replace the plug...Moses Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted February 4, 2016 Administrators Share Posted February 4, 2016 rcomm3...Thanks much for taking time to photograph, very helpful! Lower photo catches the fill plug, facing forward below the casting flange...Use care loosening the plug, if ultra-tight, it can round out when force is applied. If worn or questionable, replace the plug...Moses Quote Link to comment Share on other sites More sharing options...
rcomm3 Posted February 4, 2016 Author Share Posted February 4, 2016 No problem once I figured out what my tablet was doing to me as far as being able to upload the pictures. still trying to get a thumbnail pic for my profile. Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted February 5, 2016 Administrators Share Posted February 5, 2016 Good to see your enthusiastic participation at the forums!Moses Quote Link to comment Share on other sites More sharing options...
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