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Unread 09-13-2009, 03:40 PM   #1
texasimport
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AMC 20 77 CJ7 to 78 CJ5??

My 78 CJ5 is stamped "A" 3.54 open and I found a 77 CJ7 stamped "N" 3.54 trac lock can I do a direct swap. . .any supporting hardware need for trac lock??? sorry to sound like a nube but that's the case.

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Unread 09-13-2009, 03:59 PM   #2
trailridin4x4x4
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should be a direct swap, no hardware needed other than new fluids be sure u buy "limited slip" attitive with your gear oil.
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Unread 09-14-2009, 02:24 PM   #3
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Quote:
Originally Posted by texasimport View Post
My 78 CJ5 is stamped "A" 3.54 open and I found a 77 CJ7 stamped "N" 3.54 trac lock can I do a direct swap. . .any supporting hardware need for trac lock??? sorry to sound like a nube but that's the case.
Do you want to swap the entire axle in, or just the LSD carrier and ring gear?

You can swap the entire LSD axle in place of the open axle, but if you want to swap the LSD and ring only, you need to do a gear setup.
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Unread 09-14-2009, 03:26 PM   #4
jeepdaddy2000
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No offense, but if your doing the swap for the Trac Lok, don't waste your time. I have a very low opinion of these after seeing countless numbers of them grenade and would rather run an open diff if given the choice.
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Unread 09-14-2009, 07:33 PM   #5
texasimport
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Thanks guys. . . .found a nice amc 20 "A" 3.54 open. . . . .from a friend no less. . . . recent brakes bearings and in good working order. He 's doing a full build and wants stronger. And I get the dana 30 to also in good shape, so might swap that one too. I might as well do new springs and shocks while I'm in there. Told my son we have this thing in shape with in a year, might be ahead of schedule.
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Unread 09-14-2009, 07:46 PM   #6
gojeepin
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What year are the axles you just found?
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Unread 09-14-2009, 07:56 PM   #7
texasimport
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Not actually sure late 70's early 80's will know tomorrow. AMC 20 narrow and it should fit. The guys a mechanical engineer so I know he did it right. Is there a year or years to stay away from?
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Unread 09-14-2009, 08:33 PM   #8
gojeepin
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The only CJ AMC 20 rear you couldn't use is the one for the Quadratrac.

I thought maybe you found some wide-track axles... they'd bolt right in.
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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Unread 09-14-2009, 10:30 PM   #9
80cj
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Quote:
Originally Posted by jeepdaddy2000 View Post
No offense, but if your doing the swap for the Trac Lok, don't waste your time. I have a very low opinion of these after seeing countless numbers of them grenade and would rather run an open diff if given the choice.
Exactly. They don't perform very well as a limted slip and the case is useless for installing a lunchbox locker. Even when new, it is barely better than an open diff. I ran GL-5 in mine and never had any problems with chattering. No need to add friction modifier. I pulled it out after running it for only 30K miles and replaced it with an Auburn. Better but not as good as a Truetrac.

Last edited by 80cj; 09-14-2009 at 10:59 PM..
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