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Unread 02-17-2011, 08:53 AM   #1
PlowJeepCJ5
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Dana 30/AMC 20 axle lengths

Hello all,

I am new to the forum and am also new to my CJ5. I look forward to being part of the community.

My question today is: Is the Dana 30 front axle slightly shorter in length than the AMC 20 rear? Those are the axles that I believe that I have and I just noticed the other day that my rear tires have a slightly wider stance than my front tires.

The reason that I am inquiring is that the mount for my snowplow is such that I cannot fully turn to the right without rubbing my left front tire on the left side of the mount.

I am thinking about mounting wheel spacers up front to help move the tires a little away from the mount but I wanted to see if my front axle was in fact shorter than my rear.

Thanks!

Nate

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Unread 02-17-2011, 09:14 AM   #2
CSP
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It's actually the opposite. The front should be wider. Someone may have installed a wide track AMC20 though, but it would still be about an inch narrower than your front axle.

The narrow track axle widths (all CJ5's had narrow track) are 54.5" for the front and 50.5" for the rear. These measurements are wheel mount surface (WMS) to WMS.
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Unread 02-17-2011, 09:17 AM   #3
BriansCJ
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Quote:
Originally Posted by CSP View Post
It's actually the opposite. The front should be wider. Someone may have installed a wide track AMC20 though, but it would still be about an inch narrower than your front axle.

The narrow track axle widths (all CJ5's had narrow track) are 54.5" for the front and 50.5" for the rear. These measurements are wheel mount surface (WMS) to WMS.
I though narrow tracs were 50.5" Front and rear and Wide tracks were 54.5" front and rear.

I guess I'll go measure my '5 in a little bit.
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Unread 02-17-2011, 09:26 AM   #4
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No, fronts are wider in CJ's. 100% positive of that.

When YJs, XJs, TJs etc came out the fronts and rears became the same width.
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Unread 02-17-2011, 09:31 AM   #5
PlowJeepCJ5
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I will measure later and report on the results. I sure do wish they were reversed because my turning radius, especially with my snowplow mount issue, is very poor. I have to three point most turns to the right. To the left is not as bad.
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Unread 02-17-2011, 09:34 AM   #6
BriansCJ
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Quote:
Originally Posted by CSP View Post
No, fronts are wider in CJ's. 100% positive of that.

When YJs, XJs, TJs etc came out the fronts and rears became the same width.
No argument.

I was just going by the list in this thread.

http://www.jeepforum.com/forum/f8/wi...rments-751574/
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Unread 02-17-2011, 10:11 AM   #7
PlowJeepCJ5
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CSP, Where exactly on the tire do I go to measure the WMS? Thanks.
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Unread 02-17-2011, 10:54 AM   #8
CSP
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WMS is wheel mounting surface aka where the back of the wheel makes contact when you bolt the wheel/tire to the axle. It's the area around the lug studs, not the tire.
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Unread 02-17-2011, 11:03 AM   #9
PlowJeepCJ5
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Ok, thank you. I will take the measurements and report back. I may be wrong in my assumptions of which axles I am running with. I am just getting started and assumed that they were the stock axles. It sounds to me like someone has made a switch somewhere down the line (as is the case with me having the AMC 304). I will dig into this further. Thanks for your help. ~Nate
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Unread 02-20-2011, 07:08 AM   #10
Trimble1
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Have you measured the axle lengths yet? I'm just curious because I'm thinking of tearing apart my 83 CJ5 and I just measured my AMC 20 rear at 50" and my Dana 30 front at around 52". Does this sound right? Wide track on a CJ5? I thought everybody said only narrow on a 5, or are those numbers for a narrow track. Sorry didn't want to hijack the thread. Thanks in advance.

jim
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Unread 02-20-2011, 07:58 AM   #11
BriansCJ
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Quote:
Originally Posted by Trimble1 View Post
Have you measured the axle lengths yet? I'm just curious because I'm thinking of tearing apart my 83 CJ5 and I just measured my AMC 20 rear at 50" and my Dana 30 front at around 52". Does this sound right? Wide track on a CJ5? I thought everybody said only narrow on a 5, or are those numbers for a narrow track. Sorry didn't want to hijack the thread. Thanks in advance.

jim
Thos are a narrowtrack definitely.
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Unread 02-20-2011, 10:37 AM   #12
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Hi Jim, No I have not had a chance to measure yet. I'm out of town until tomorrow. I'll measure them as soon as I get back because I'm really looking forward to investigating exactly what I have. (On a side note, I am searching on the forum for someone that lives near me that is knowledgeable about these things to help me out.) -NB
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Unread 02-20-2011, 11:08 AM   #13
VACJ7
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Like CSP said, front axle will always be wider than the rear unless someone swapped it out.

Wide
56 front
54.5 rear

Narrow
53 front
50.5 rear
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Unread 02-20-2011, 11:52 AM   #14
PlowJeepCJ5
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Thanks, VACJ7. Those are exactly the numbers that I was looking for. I'll get the measurements in the next day or two and report back. I'm really interested in finding out what exactly I have.
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Unread 02-20-2011, 11:33 PM   #15
BriansCJ
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I just picked up a set of widetracks.
Ill try to get some more accurate measurements tomorrow b/c I took these when it was dark.
Front 56
Rear 55.
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