AMC Mod 20 Help... - JeepForum.com

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post #1 of 16 Old 11-01-2012, 10:30 PM Thread Starter
DirtyCJ7
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AMC Mod 20 Help...

Hi Fellow CJers,
I grenaded the AMC 20 in my 84 CJ7. No I wasn’t on some crazy trail or remote desert location “Thank God” It was in the parking lot of my local Starbucks. I Know, Don’t say it, at Starbucks.

As I understand it the Track Lok system is inherently prown to failure after years of abuse and in a 28 year old vehicle it was a matter of time.

My plan now is to install one piece axels, new bearings and seals, re-gear to a more appropriate ratio for my 35x12-50 tires, and install a new gear carrier.

I know it’s a AMC 20 and it might not be wise to put money into this weak link but I figure it’s worked perfect for 28 years and don't have the thousands to upgrade.

So to my question:
I am not going to use an ARB to costly. So I am thinking a Auburn Limited Slip, Detroit/Eton Locker any ideas or advice. Any input would be greatly appreciated.

By the way I use my rig on the road in California so a Posi probably not the best option.

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post #2 of 16 Old 11-02-2012, 12:09 AM
outdoorguy86
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Many will.say not to waste money on a amc 20. I have a 20 in my 83. When I bought it it had one piece axles. One of the only things to PO did right. I regeared from 2.73 to 4.10, welded and trussed it, and threw in a Richmond lockrite. I'd say if you don't plan on running 37s or something ridiculous lime that you will be fine.

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post #3 of 16 Old 11-02-2012, 04:47 AM
OrangeCJ-5
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When I replaced the 8.8 with a 9" in my '87 Bronco I had Currie re-gear for the 35" tires and install a Detroit locker. I like it but it is quirky. When it was new you could both hear and feel it ratchet and re-lock as you turned. It's not as bad now but i have also gotten used to it. The rear would 'jump' as this was happening. Also, if on the gas, it does want to push the front end a little. For a 95-100% street truck I would think a limited slip would be the better way to go as opposed to a locker.
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post #4 of 16 Old 11-02-2012, 05:13 AM
brownbagg
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I got Aussie lockers on mine ,very happy with them
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post #5 of 16 Old 11-02-2012, 06:06 AM
cjjon7
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Garage
About to install 4.56's and a lockrite in mine as well. Currently has Yukon 1pc shafts and has never given me trouble. Will be welding the tubes and new perches upon removal as well.
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post #6 of 16 Old 11-02-2012, 08:43 AM
wm69
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Put a truetrac in the back. Good road manners, no clutches, and lots more traction.

85 CJ7 258, borla header, Team Rush, MC2100 ,optima batt, Warn 8274, agr super box 2 & pump, T5 w/ B&M shifter, centerforce 2, superior 1 piece axles, warn hubs 2.5 in lift, 31" BFG MT

85 CJ7 258, A/C, T176, MC2100, Team Rush, Warn XD8000i, superwinch hubs, 3in lift 31" BFG AT/KO
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post #7 of 16 Old 11-02-2012, 09:31 AM
RobsCrawlin7
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I would go with a limited slip or a selectable for the rear. I have a detroit in mine and while I love it on the trail, I hate it on the road. All full time lockers are essentially the same.

'01 TJ 4.7/NV3550, 2" lift, 35's, locked.
'79 CJ7 stock, 304
'98 XJ sold
'79 CJ7 sold
'82 CJ7 parted
'89 MJ sold

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post #8 of 16 Old 11-02-2012, 12:54 PM
gosupes
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Quote:
Originally Posted by wm69 View Post
Put a truetrac in the back. Good road manners, no clutches, and lots more traction.
Same setup here, very good street manners.

1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.

It's just a Jeep, and if you don't wheel it once in a while, it's not even that.
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post #9 of 16 Old 11-02-2012, 01:25 PM
ASteve
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Quote:
Originally Posted by gosupes View Post
Same setup here, very good street manners.
X2...I just did this when I intalled my Moser axles. More recently I just installed some one piece Moser axles on my friends AMC Mod. 20. Very easy install.

SC
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post #10 of 16 Old 11-02-2012, 02:05 PM
jreycnc
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My jeep is getting an Auburn Pro line LSD installed in it right now while I'm at work. From what I've heard its not quite the traction of a locker but way more driveability which recently is much more important to me then off road traction.
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post #11 of 16 Old 11-02-2012, 09:46 PM
outdoorguy86
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You can def tell that auto locker is there in the rear. Slow speeds it bumps and chirps when turning. Every once and a while you get a horrendous pop. Shifting at high speeds causes it to kick a little, at least on mine. It's predicts let now though. Still haven't had it on the packed snow or ice so can't comment on thst

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post #12 of 16 Old 11-03-2012, 08:05 AM
82JeepCJ7
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Spool it. You will always know how its going to react and the traction is unparallelled.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #13 of 16 Old 11-03-2012, 10:03 PM Thread Starter
DirtyCJ7
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Quote:
Originally Posted by 82JeepCJ7 View Post
Spool it. You will always know how its going to react and the traction is unparallelled.
OK i'm an idot "SPOOL IT", what?
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post #14 of 16 Old 11-04-2012, 04:41 AM
OrangeCJ-5
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A spool is a locker except that it does not have any spider gears to account for making turns. Both rear wheels will turn at the same speed at all times or at least try to. I would suggest going to Randy's ring and pinion ( ringpinion.com ) and look at the descriptions of the different traction devices they carry.
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post #15 of 16 Old 11-04-2012, 09:48 AM
82JeepCJ7
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I've been running a spool in mine since 1998. Except for the occasional "bark bark bark" when turning tight in a parking lot, its not bad on the street. The Jeep tracks strait ahead on the freeway. I like it because there is no change in the way it handles going into, through, and exiting a corner. Its always the same.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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gear carrier , limited slip , limited slip differential , rear end

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