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Unread 02-21-2012, 07:45 PM   #1
breakthru
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1985 CJ7 
 
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Dana 30 gear identification?

Is there a way to tell which gears I have in my Dana 30 front end? I believe my amc20 is 3.73 based on the stamped housing, but I can only find numbers and an "NC" stamped on the Dana 30. Any help is much appreciated.

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1985 CJ-7 258ci with a T5 tranny, Dana 300 t-case with Tera Low 4:1, 4" sagging Suspension lift, Warn floating axles, all around disc brakes, DUI Distributor, stainless brake lines, flexalite dual electric fan, weber carb, and 33 AT. Future mods include going to 35's under a Rubicon Express lift with full body replacement, interior restore and train horn... with time, money, and weather permitting.
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Unread 02-21-2012, 08:39 PM   #2
breakthru
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Here's all the numbers I can find on the housing and they are spaced as noted.

610164 2 7 27 4 5B front housing

84 180 bottom web

NC. Bottom web

C 37671 top web near tire

Help please!!! :/
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1985 CJ-7 258ci with a T5 tranny, Dana 300 t-case with Tera Low 4:1, 4" sagging Suspension lift, Warn floating axles, all around disc brakes, DUI Distributor, stainless brake lines, flexalite dual electric fan, weber carb, and 33 AT. Future mods include going to 35's under a Rubicon Express lift with full body replacement, interior restore and train horn... with time, money, and weather permitting.
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Unread 02-21-2012, 08:46 PM   #3
jeepinjeffrey
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If you have 4wheel Drive it will only work with both axels geared the same or else it will shred your spider gear teeth so if you have used 4WD then you know there the same so if the back is 3.73 the front should be also
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Unread 02-21-2012, 08:57 PM   #4
VACJ7
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I don't think I would trust what either housing is marked. If you open them up the gear ratio should be stamped on the ring gear.
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Unread 02-22-2012, 07:29 AM   #5
CSP
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Without the tag identifying the gear ratio, those stampings aren't going to tell you the gear ratio.

Pop the cover off and look for the stamps around the circumference of the ring gear. You'll see numbers like 41 10 which are the tooth counts for the ring gear and the pinion gear, respectively.
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Unread 02-22-2012, 07:53 AM   #6
Joe100
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I have a 1949 CJ-2A that I'm working on it has a tag on the Front and rear diff. they are both marked with 43 over 8 I would assume that 43/8 is just that.good luck to you Joe100
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Unread 02-22-2012, 08:42 AM   #7
Herb31
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Jack it up and spin the wheel with the hubs locked. (wheel chucks and/or e-brake on!) for each two revolutions of the tire, count how many times the driveshaft goes around...that will tell you your gearing.

This method is how I discovered that I had 2.73 in the rear and 3.54 in the front. DOH! So, I would double check front and rear if I were you.
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