AMC 20 open dif or posi - Page 2 - JeepForum.com
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post #16 of 17 Old 07-21-2009, 09:31 PM
SlikRic
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Quote:
Originally Posted by Stacydmcc View Post
Thank you for the clarification. I appreciate it. Gives me something to think about I guess.
You have an open diff You are good going with a locker If your tires spin different when spun and jacked off the ground, that is OPEN


edit: If you had L/S it would leave even tire marks on HARD pavement if you bark them.


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post #17 of 17 Old 07-21-2009, 11:39 PM
JeepHammer
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[QUOTE=mudnut;6023969]I have an 85 CJ7 with the AMC20 rear, is there a way to tell if I have an open carrier or a limited slip without pulling the rear cover off?

The stright answer is 'NO'.
Worn clutches in a posi unit will seem like an open diff.
Really no way to tell without popping the cover off and having a look.

As for identifying the differential, that's VERY easy.
AMC (Spicer) model 20 has 12 Bolts, Usually 'Torx' heat bolts, in a perfectly round rear cover.

Posi units in AMC 20 rears were about as common as they are in about any other type of vehicle of the era, so you can expect about 25% of the vehicles produced were ordered with Posi Rears.

They aren't rare, and they are available used, along with all the parts necessary to rebuild one to factory specifications.

DANA 44 rear differentials will have 10 Bolts, regular hex head bolts and the cover will be the same shape as your front differential has.

For some reason, I see more Posi units in Dana 44 rear differentials than I do AMC 20 Rears, so I would say that about 1/3 of the Dana 44's I see have posi units.

Just to clear up some other things I read in this thread,
NO ONE EVER put a Dana 30 in the REAR of a CJ.

You Should NEVER run a spool in the back of a CJ that is street driven!!!
It's just flat dangerous, and it's VERY hard on parts (axles, bearings, tires, ect.)

Anyone that tells you differently is an idiot or trying to sell you parts!
---------------------------------------

Quote:
I'm trying to decide on a locker and am either looking at an Aussie or a Lock Right.
Neither will go in a posi.
Neither is what I'd call a good idea for the REAR of a CJ.
Both are 'Full Time' lockers and cause problems with driveability on the street or on sand, gravel or dirt roads.

Quote:
Had considered the No Slip from Power Trax which does come in a posi carrier friendly model but I can't use a 1 piece axle conversion with it.
Do you know who made your one piece axles?
Most of the time to make them 'Locker Frendly' you simply have to shave some off the spline end of the axles to make them fit properly...

Quote:
I don't want to get into too much money with this as I'm not sure that I will keep the AMC 20 but I'll have it for awhile and want to stick a locker in while I have it.
I would reconsider if it has a posi in the rear.
I've seen guys with a little 'Lunch Box' locker in the front and a fresh rebuilt posi in the rear go places you wouldn't believe!

Quote:
I do want to avoid having to go to the shop to have an open carrier installed just to get the "easy to install" locker in, that just seems like it would be expensive but at the same time I don't want the 2 piece rear axle as I see that breaking at least once before I put in a 1 piece. I've never "set up" a rear end before and not sure that I'm even set up for it. (Damned if I do and Damned if I don't it would seem)
This is common, if you go with the 'Lunch Box' lockers that are $200 to $300 and you have to change carriers to get there,
You have to add the cost of the carrier,
Plus you have to throw in another $200 or $250 to set up the gear set again!....
Makes the 'Cheap' locker darned expensive!

Quote:
I don't plan on doing any hard core wheeling but going out with the local club on easy to moderate trails I can't see being that comfortable without a locker (cheaper than a winch LOL)
Hard pack is MURDER on a full time locker in the back (Lunch Box lockers take the worst of it),
And a spool is SUSCIDE on rear end parts...

Best bet for trails and about anything but hard core rock crawling or mud drags is a TIGHT POSI in the rear...
That way you can do roads, hard pack trails, what ever.
In the front you can run a full time locker because you can UNLOCK the wheels to save the locker on hardpack...

Personally,
I have a Detroit TrueTrac in the rear of my little Jeep,
And a 'Lunch Box' in the front, and I couldn't be happier with the way it performs on the street or trails!

I wheel trails with guys that have Lunch Box lockers in the front and factory posi in the back, and they keep right up with the guys with both ends locked...

The Detroit TrueTrac just gives me a little more traction in the rear, and it has the best road manners of ANY posi or locker I've ever ran! (Costs $600 though, so it's not cheap!)

In my dedicated (Read: Trailered Rig that is broken a lot!) I have full size selectable lockers both front and rear, but it's pretty well a crawler/buggy now...

REMEMBER,
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