HOW to tell if I have piece AMC 20 axle? - JeepForum.com
 
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post #1 of 14 Old 08-19-2019, 02:04 PM Thread Starter
shok47
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Hi,

What are the ways can I tell if I have 1 piece axle upgrade other than pulling out the axle? Any easy way to see?


I IDed my axle, AMC code B so its a 3.31 OPEN. I have 35's on it and it'd be good to know before address this setup. 20190818_202330_1566245383742.jpg

Here are some pics of the inside if it can provide any other information. The opinion has a +4 marked in it??

Thanks

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post #2 of 14 Old 08-19-2019, 02:21 PM
Hoover7
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If it is a two-piece axle, there will be a large castle nut holding the hub to the axle, which you could see by removing the tire (with center cap, if you have one), and possible dust shield. One piece axles would not have this.

amc20-hub-two-piece-axle.jpg

A google search for other images (AMC 20 2-pc axles) could help as well-

Hoover

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post #3 of 14 Old 08-19-2019, 03:58 PM Thread Starter
shok47
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Quote:
Originally Posted by Hoover7 View Post
If it is a two-piece axle, there will be a large castle nut holding the hub to the axle, which you could see by removing the tire (with center cap, if you have one), and possible dust shield. One piece axles would not have this.

Attachment 3851349

A google search for other images (AMC 20 2-pc axles) could help as well-

Hoover
Ah very helpful! Will check soon!

Thanks
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post #4 of 14 Old 08-19-2019, 04:21 PM
trailhead2004
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Quote:
Originally Posted by Hoover7 View Post
If it is a two-piece axle, there will be a large castle nut holding the hub to the axle, which you could see by removing the tire (with center cap, if you have one), and possible dust shield. One piece axles would not have this.

Attachment 3851349

A google search for other images (AMC 20 2-pc axles) could help as well-

Hoover
shok, it's real easy if you don't have the center caps on your wheels.

This guy has center caps so he needs to remove the wheel to get to the axle end/dust cap.

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This guy doesn't have center caps on so you can see the dust cap over the castle nut. He has two piece axles.

1519509058565ef66e7dff9f98f91530e4-e45f-489f-a5f4-d6e560358a6d_zps3jdxe2yn-940x705.jpg

My CJ7 has one piece axles, you can tell by the flat end of the axle flange with no center cap and no dust cap.

img_5989.jpg
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post #5 of 14 Old 08-19-2019, 09:58 PM
RiverandSand
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No sure why your pics are showing the dana 30 front diff, when you are asking about the amc 20 rear axle. As others have said look for the castle nut which holds the hub to the axle. Traihead and Hoover have some good shots of the difference.
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post #6 of 14 Old 08-20-2019, 05:00 AM
John Strenk
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Quote:
Originally Posted by RiverandSand View Post
No sure why your pics are showing the dana 30 front diff, when you are asking about the amc 20 rear axle. As others have said look for the castle nut which holds the hub to the axle. Traihead and Hoover have some good shots of the difference.
Good point.

I missed that also.

hope he comes back and tells us more.


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post #7 of 14 Old 08-20-2019, 07:36 AM Thread Starter
shok47
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Ahh yes, I'm just throwing differential questions at you guys left and right. 🙂

I'm tackling the 30 right now so I also wanted to see if that was stock looking as well.

I will be getting to the amc20 next. I'm just getting back into the jeep world with a big boy job to fund me and I'm kind of all over the place. Fun fun! 🙂

I have the dust covers so I cannot tell at the moment.

Do you guys keep those on or take em off? A friend that has a cj7 took his off so just curious.

Thanks
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post #8 of 14 Old 08-20-2019, 07:55 AM
Hoover7
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Shok,

As for the axles, the presence of the dust cover indicates that this is a stock two-piece setup, and solid axles wouldn't need one. If it were me, I'd certainly take them off to inspect and re-torque those castle nuts, and then replace the covers- at least for the short term. Given that you have the 2-piece axles, and running the 35's, installing a set of solid axles would be a good upgrade. Also, are you considering any differential (gearing) changes? As you might be aware, the 3.31's aren't quite enough to push those 35's efficiently.

Hoover

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83 CJ8 Scrambler, 360, T176, EFI, in progress
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post #9 of 14 Old 08-20-2019, 11:21 AM Thread Starter
shok47
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Quote:
Originally Posted by Hoover7 View Post
Shok,

As for the axles, the presence of the dust cover indicates that this is a stock two-piece setup, and solid axles wouldn't need one. If it were me, I'd certainly take them off to inspect and re-torque those castle nuts, and then replace the covers- at least for the short term. Given that you have the 2-piece axles, and running the 35's, installing a set of solid axles would be a good upgrade. Also, are you considering any differential (gearing) changes? As you might be aware, the 3.31's aren't quite enough to push those 35's efficiently.

Hoover

Attachment 3851675

Ahh good to know. I am here near the jeep and will take off the wheel to check.

I actually plan to lower it and put on 30-31. I would like to keep these wheels but they are possibly 10.5 running 12.5 as I asked in another thread. I'd like to keep the wheels and fit new tires so I dont have to address the fenders being too wide


What type of lift do I have? Ild like to go 2.5" suspension lift. Keep the body lift for now and address that in the future since those bolts looks pretty baaaaad
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post #10 of 14 Old 08-20-2019, 12:56 PM
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Looks like a 2" body lift and 4" suspension lift. For 31s, I would ditch the body lift and go look into the 2.5" OME lift.

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #11 of 14 Old 08-20-2019, 01:35 PM
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FYI - I run 31X10.50 BF Goodrich All-Terrain T/A tires on 15X8 steel wheels on my stock '79 CJ5 with no lift of any sort.

My CJ5 has the factory "Extra-Duty Suspension Package" - 6 leaves per spring. Don't know if this provides any extra room for 31s.

Actual overall diameter of my 31s per BF Goodrich web site is 30.5 inches. I don't notice any rubbing.

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post #12 of 14 Old 08-21-2019, 08:50 AM Thread Starter
shok47
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Quote:
Originally Posted by Hurricane4 View Post
FYI - I run 31X10.50 BF Goodrich All-Terrain T/A tires on 15X8 steel wheels on my stock '79 CJ5 with no lift of any sort.

My CJ5 has the factory "Extra-Duty Suspension Package" - 6 leaves per spring. Don't know if this provides any extra room for 31s.

Actual overall diameter of my 31s per BF Goodrich web site is 30.5 inches. I don't notice any rubbing.

Hi Hurricane4,

That sounds ideal as I don’t want to be such an eye catcher with the excessive height, especially in MA where they are strict on the vehicle inspection. I could get it passed but it is still a valid reason to pull me over.

I would like to go back to stock height, leave the body lift for now and if the bolts are not bad, take that off as well.


So to go back down to stock, Just need:

Leaf springs
Shocks
Adjustable sway bar link or just stock.
Remove Tcase drop (do I really need to or can I leave it?)
U bolts and other leaf hardware


I couldnt find a kit with stock height, only 2.5" lift and up. Do I have to buy individually? If i source out the kit, seems to cost more than a 2.5" lift from skylift or any of those less expensive ones. I am trying to keep the cost low so no OME

Thanks
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post #13 of 14 Old 08-21-2019, 10:06 AM
Hurricane4
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Check here for stock leaf springs for your '83 CJ7:

https://www.generalspringkc.com/Leaf...986_s/1951.htm

"The unbelievable we can do immediately . . . the impossible just takes a little longer."
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"Success is not final. Failure is not fatal. It is the courage to continue that counts"
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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 #14 of 14 Old 08-21-2019, 02:00 PM
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Quote:
Originally Posted by Hurricane4 View Post
Check here for stock leaf springs for your '83 CJ7:

https://www.generalspringkc.com/Leaf...986_s/1951.htm
Sweet! Thanks for the info! Iíve been looking for stock height YJ springs for my CJ for a while.
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