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Unread 02-10-2010, 12:38 AM   #1
kluman
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14 bolt GM Rear Differential

I want to put GM 14 bolt differentials under my 1979 CJ 5. It has a 304. Is that big enough for those heavy differentals?

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Unread 02-10-2010, 03:59 AM   #2
CJ_heath
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Gear ratio? TIre size? What kind of wheeling do you do?
The 14 bolt hangs low, because the diff is huge, so if you aren't putting at least 37-38 inch tires I don't think it would be worth it, because it would be an overkill.
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Unread 02-10-2010, 04:27 AM   #3
kercher
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it is also quite wide, usually 69" wms-wms i think depending on srw/drw. How are the tire coverage laws?
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Unread 02-10-2010, 04:38 AM   #4
CJ_heath
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If you run C&C hubs you can get the WMS~WMS measurement down to around 63". Just throwing that out there.

ALSO: kercher I clicked on your jeep link in you signature and it appears to be broken. I wanted to check it out.
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Unread 02-10-2010, 08:18 AM   #5
CSP
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The SRW 14 bolt is 67.5" wms to wms. The cab & chassis is 63.5". The dually pickup version is about 72".

Unless you're on 38" or taller tires you don't want a 14 bolt unless you intend to drag the rear axle over everything.

There is no such thing as a 14 bolt front axle in reference to "differentials" from the OP (unless you build your own).
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Unread 02-10-2010, 09:39 AM   #6
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Quote:
Originally Posted by CSP View Post
There is no such thing as a 14 bolt front axle in reference to "differentials" from the OP (unless you build your own).

There is. AAM started building and testing their 1050 front last year (direct email response after I inquired about one for my Dodge).
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Unread 02-10-2010, 02:14 PM   #7
kercher
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Quote:
Originally Posted by CJ_heath View Post
If you run C&C hubs you can get the WMS~WMS measurement down to around 63". Just throwing that out there.

ALSO: kercher I clicked on your jeep link in you signature and it appears to be broken. I wanted to check it out.
good point about the hubs, and thanks for the note. should be fixed now.
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Unread 02-10-2010, 02:23 PM   #8
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Originally Posted by PavementPounder View Post
There is. AAM started building and testing their 1050 front last year (direct email response after I inquired about one for my Dodge).
True, but that really isn't the "14 bolt" that's being referred to here, at least as I read it.
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Unread 02-10-2010, 02:31 PM   #9
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Quote:
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True, but that really isn't the "14 bolt" that's being referred to here, at least as I read it.
Are you saying as a matter of semantics that an AAM 1050 isn't a 14bFF?


Because if you are, I respond with AMC15/Dana 35.
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Unread 02-10-2010, 03:27 PM   #10
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No, I'm saying that the widely used term is generally in reference to the GM 14b FF, especially in reference to swapping them under Jeeps. As in the predecessor to the AAM 1050, prior to AAM as a spin off from GM. Different company, different axle.

We don't call a Dana 44 a 10 bolt, despite them having 10 bolts holding the cover on.

Edit: The OP specifically said "GM 14 bolt differentials". GM didn't make a 14 bolt front axle.

Last edited by CSP; 02-10-2010 at 03:47 PM..
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Unread 02-10-2010, 03:51 PM   #11
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No, I'm saying that the widely used term is generally in reference to the GM 14b FF, especially in reference to swapping them under Jeeps. As in the predecessor to the AAM 1050, prior to AAM as a spin off from GM. Different company, different axle.
By that logic, HP and LP D44's should not be the "same axle" due to differences in the housing parts. Differential models are defined by the ring & pinion relationship. The AAM is the 14bFF with some updates.

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We don't call a Dana 44 a 10 bolt, despite them having 10 bolts holding the cover on.
No, we don't because it is not the same ring & pinion design as the GM 10b - regardless of what other parts are bolted to the housing that might be shared with other model axles.
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Last edited by PavementPounder; 02-11-2010 at 07:21 AM.. Reason: Quote code fix.
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Unread 02-10-2010, 04:06 PM   #12
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I think we both know that the OP wasn't talking about the AAM axles, which is my point. I'm going to leave it at that rather than arguing jsut for the sake of arguing.
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Unread 02-11-2010, 06:24 AM   #13
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The 14 bolt is an Eaton with updates, but we don't call it a 14 bolt.
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