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Unread 05-24-2009, 03:33 PM   #1
Blue84JeepCJ7
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1984 CJ7 
 
Join Date: Sep 2005
Location: Hahira, Ga
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CJ-7 Dana 30 I.D.

I found the numbers on my Dana 30 front axle. Its 3:54 gears. Also stamped on the plate are the following numbers:

46-13

5363735

Can ya tell me what is what? I'm sure one is the date and the other maybe the part number?

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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
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Unread 05-24-2009, 03:38 PM   #2
BESRK
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The 46-13 is the ratio.. it's the number of ring gear teeth and the number of pinion gear teeth... 46/13=3.538

Not sure what the other number is...
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Unread 05-24-2009, 03:39 PM   #3
Blue84JeepCJ7
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Quote:
Originally Posted by BESRK View Post
The 46-13 is the ratio.. it's the number of ring gear teeth and the number of pinion gear teeth... 46/13=3.538

Not sure what the other number is...
well shut my mouth, leanrt somethen new today!
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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
3" Body Lift
Be-Cool Radiator
Black Magic 175 Cooling Fan

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Unread 11-30-2011, 11:15 AM   #4
LongueCarabine
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1985 CJ7 
 
Join Date: Mar 2008
Location: South Louisiana
Posts: 192
Whoa! Something is not making sense on my 85 CJ. My rear AMC 20 has a code of DD, which corresponds to a 2.73 Trak Lok per the charts on Jeeptech.

My front Dana 30 lists the same codes as the poster above (3.54). The tag reads as follows:

5363735
3-54 46-13

What gives? I am sure that both axles have the same ratios ( I haven't noticed any problems along those lines). So what next? Do I need to tear down each diff and count teeth?

This came about because I am changing out my rear axle pinion seal.

LC
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Unread 11-30-2011, 12:49 PM   #5
CSP
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Originally Posted by LongueCarabine View Post
So what next? Do I need to tear down each diff and count teeth?
That's what I would do if it were mine.
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Unread 11-30-2011, 01:35 PM   #6
WindKnot
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Or at least count driveshaft rotations per wheel rotation. It won't be as accurate, but would be close, less trouble and cleaner. I'd only worry and explore more deeply if the front count didn't match the rear. It will give you a pretty good idea of what the ratio is. I doubt someone would go to the trouble of changing a 3:54 to a 3:71. I bet it would be more drastic than that.

The tag only tells you how it was built at the factory. Once it leaves... who knows? ESPECIALLY on a 30 some odd year old Jeep.
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Unread 11-30-2011, 05:02 PM   #7
Rick7
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1978  
 
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If the front and rear ratios were that far different, you would notice right away. At one time I bought a CJ5 and later discovered it had mismatched ratios front and rear. The first time I used 4wd was on ice waiting in line with cars to go up to Lake Tahoe on Hwy 50. I applied the throttle to move forward, and there was no forward movement at all,-- as soon as the wheels started turning at different speeds, the Jeep immediately slid sidewise off the side of the road. I did the remainder of the trip in 2wd.
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Unread 11-30-2011, 06:37 PM   #8
LongueCarabine
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Location: South Louisiana
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Thanks for the responses. I am probably going to open up both pumpkins anyway to make sure which I have, since I am going to re-power this thing hopefully soon. It's obvious that one of them changed, and I want to make sure I know what ratio I have. Since I am doing the pinion seal anyway, this is the perfect time.

LC
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