79 CJ5 AMC Model 20 Differential Cover - JeepForum.com
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post #1 of 23 Old 06-18-2021, 07:28 PM Thread Starter
Hurricane4
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79 CJ5 AMC Model 20 Differential Cover

Wondering what aftermarket AMC 20 Diff Covers everyone is using. I would like to have a drain plug in the cover. My original cover looks like the Torx bolts were way over-tightened. The cover is very distorted.


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Jeeps I Have Owned in Year Order:
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post #2 of 23 Old 06-18-2021, 07:44 PM
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Jeep #2 got a Plexiglass??? one. (clear anyway)

It was neat in that you could see the juice sloshing around when it was moving.

Got it in a 4 X 4 store in Savannah in '83 or '84

The vehicle behind you got the "Show"

Other than that, you could make a inspection of the level without pulling the fill plug.

You have had the Torx bolts out before???

Why didn't you sling them in the woods then and replace them with some Grade 8 hex bolts???

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post #3 of 23 Old 06-18-2021, 08:06 PM Thread Starter
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Already removed the diff cover Torx bolts. Going to replace with Hex Head bolts. Looks like PO or someone over-tightened the Torx bolts
and distorted the diff cover. had a heck of a time removing the last 3 Torx.

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
My College Accounting Professor

"Success is not final. Failure is not fatal. It is the courage to continue that counts"
Winston Churchill

Jeeps I Have Owned in Year Order:
'61 CJ5, '63 CJ6, '78 CJ5, '79 CJ5 (Current), '79 CJ7 & '86 CJ7.
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post #4 of 23 Old 06-18-2021, 08:10 PM Thread Starter
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Here are photos of the last two Torx bolts we removed. What a pleasant afternoon. The Torx fasteners will be pitched.
Attached Thumbnails
F9C8AC61-B771-480A-BD01-6F78CAB66CCF_1624068608014.jpg   E05215DD-F7C6-41C7-9845-46A98EDDA313_1624068617003.jpg  

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
My College Accounting Professor

"Success is not final. Failure is not fatal. It is the courage to continue that counts"
Winston Churchill

Jeeps I Have Owned in Year Order:
'61 CJ5, '63 CJ6, '78 CJ5, '79 CJ5 (Current), '79 CJ7 & '86 CJ7.
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post #5 of 23 Old 06-18-2021, 10:36 PM
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The torx fasteners were/are used for factory assembly probably because they're more power tool friendly than allen or philips. I am the original owner of my Jeep and therefore the only one that has done any work on it other than painting. I still have all my original diff cover torx bolts and I find that cleaning the dirt out of the heads and torquing them to spec has resulted in zero problems. But yes, if some one over tightens the bolts then one might have difficulty. It's just a sheet metal cover and my guess is that if you have to exceed the torque spec to get a good seal, the cover may be distorted or a good gasket/sealer may help. I use a Felpro gasket and Permatex hi tack aviation sealer. Works every time.
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post #6 of 23 Old 06-19-2021, 09:51 AM
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Not many choices for AMC20, I had the same issue with mine when I rebuilt the rearend, cover was trashed and leaking. I chose a Kentrol stainless steel cover, it came with SS bolts too. It doesn't have a drain plug but you add one, I plan to add one next time the cover comes off.
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post #7 of 23 Old 06-19-2021, 10:15 AM Thread Starter
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Thanks all for the input. One question: is the Kentrol diff cover the same height as the OEM cover? My ‘79 CJ5 has a 15 gallon tank and there isn’t much room between the top third of the diff cover and the tank skid plate.

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
My College Accounting Professor

"Success is not final. Failure is not fatal. It is the courage to continue that counts"
Winston Churchill

Jeeps I Have Owned in Year Order:
'61 CJ5, '63 CJ6, '78 CJ5, '79 CJ5 (Current), '79 CJ7 & '86 CJ7.
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post #8 of 23 Old 06-19-2021, 10:17 AM Thread Starter
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Anyone use the PML AMC 20 diff cover? Or another brand? Just wondering how they clear the fuel tank skid plate.

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
My College Accounting Professor

"Success is not final. Failure is not fatal. It is the courage to continue that counts"
Winston Churchill

Jeeps I Have Owned in Year Order:
'61 CJ5, '63 CJ6, '78 CJ5, '79 CJ5 (Current), '79 CJ7 & '86 CJ7.
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post #9 of 23 Old 06-19-2021, 12:39 PM
mpulokas
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I got the OX covers (from OX locker brand). a little spendy... https://ox-usa.com/product/oxamc-16p/
Cast and Heavy and looks nice. Drain plug and fill plugs a plenty. I think it more rounded out and will take more gear oil too. It come w/ new bolts. Make sure on the CJ AMC20 that you don't spring for a fancy gasket like lub-locker n such.. Just get the cheap thick cork one from Felpro and torque to spec.
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- MAP
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post #10 of 23 Old 06-19-2021, 12:46 PM
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Quote:
Originally Posted by Hurricane4 View Post
Thanks all for the input. One question: is the Kentrol diff cover the same height as the OEM cover? My Ď79 CJ5 has a 15 gallon tank and there isnít much room between the top third of the diff cover and the tank skid plate.
Yes, I have the same tank and shield but with a 4" lift. Most of the others covers are deeper, heavier and cost alot more than the Kentrol.
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post #11 of 23 Old 06-19-2021, 02:43 PM Thread Starter
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Thanks for the replies. Found this cover: OX Locker Model 20 OX Locker Differential Cover - OXAMC-16P. This one is cast iron and has fill and drain plugs. Description states standard oil fill. Can’t find dimensions but if it is standard oil fill this one might be good without clearance issues.

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
My College Accounting Professor

"Success is not final. Failure is not fatal. It is the courage to continue that counts"
Winston Churchill

Jeeps I Have Owned in Year Order:
'61 CJ5, '63 CJ6, '78 CJ5, '79 CJ5 (Current), '79 CJ7 & '86 CJ7.
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post #12 of 23 Old 06-19-2021, 05:19 PM
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I only seen those online not in person, so I have no clue to the size. Could try calling the manufacturer for the dimensions.
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post #13 of 23 Old 06-20-2021, 08:46 PM
mpulokas
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Quote:
Originally Posted by Hurricane4 View Post
Thanks for the replies. Found this cover: OX Locker Model 20 OX Locker Differential Cover - OXAMC-16P. This one is cast iron and has fill and drain plugs. Description states standard oil fill. Canít find dimensions but if it is standard oil fill this one might be good without clearance issues.



Hurricane see picture of mine installed. It sticks out 2.5" from the mount flange. The bolts in the picture are what comes with the package.
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IMG_20210620_212940.jpg   IMG_20210620_213012.jpg  

- MAP
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post #14 of 23 Old 06-20-2021, 09:44 PM Thread Starter
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Thank You!

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
My College Accounting Professor

"Success is not final. Failure is not fatal. It is the courage to continue that counts"
Winston Churchill

Jeeps I Have Owned in Year Order:
'61 CJ5, '63 CJ6, '78 CJ5, '79 CJ5 (Current), '79 CJ7 & '86 CJ7.
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post #15 of 23 Old 06-21-2021, 10:28 AM Thread Starter
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Talked to tech support at OX Off Road today. Their AMC 20 Heavy Duty Cover - SKU: OXAMC-16P -
measures 3.25 inches from the flat mounting surface to the outer most part of the cover.

I measured my factory/OEM cover at 3 3/16th or 3.188 inches. So the OX cover is very close to OEM.

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
My College Accounting Professor

"Success is not final. Failure is not fatal. It is the courage to continue that counts"
Winston Churchill

Jeeps I Have Owned in Year Order:
'61 CJ5, '63 CJ6, '78 CJ5, '79 CJ5 (Current), '79 CJ7 & '86 CJ7.
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