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14 Bolt gear sizes


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#16 TWITCHin

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Posted 12 April 2006 - 11:09 PM

not sure if you still need help but heres my 2 cents. there are three models of the GM 14 bolt axle. 9.5, 10.5, and 11.5 inch ring gears. the 9.5" one is found under 1500HD trucks and i believe also the older 454SS trucks. the 10.5" was GM's one ton axle untill 2001. was found under all one tons and many 3/4 tons up to 2001. in 2002 the 11.5" came out and became Gm's one ton axle. the 10.5" is still around, under 2500 non-HD trucks, the 2500HD with the d-max, 3500 and 3500HD have the 11.5" axle. the 10.5" and the 11.5 are both full floating axles and the 9.5" is a semi-floater. hope that helps. :cheers:

#17 Haulin' 8.1

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Posted 13 April 2006 - 06:55 AM

Thanks for the insight Andy. One question, in all your upto and starting in I can't determine what you're saying my 2001 2500HD has for a rear axle. It's the 8.1/allison.

Was 01 the last year of 10.5 or the first year of 11.5?

One way or another I'll find out soon when I try to put the 11.5 ring gear I picked up into it.

Thanks,
Vernon
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#18 TWITCHin

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Posted 13 April 2006 - 08:20 PM

if i am remembering corectly, 2001 was the last year of the 10.5" and the 11.5" came out in 2002. it is really easy to tell the two apart.

heres some pics of a 10.5" http://www.bluetorch...ricane/DSC00664

http://cgi.ebay.com/...sspagenameZWDVW

http://cgi.ebay.com/...978525833QQrdZ1

heres a cover for the 11.5"

http://cgi.ebay.com/...sspagenameZWD1V

cant find many pics of the 11.5" but they look totaly different so it yours doesnt look like the first 3 pics then its the 11.5". im pretty sure that it is the 10.5" though.

#19 ZZebes

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Posted 13 April 2006 - 09:05 PM

Got a hypothetical for ya'll

would a 14-bolt out of a 06 vortec max be swappable into my 06 5.3L 1500
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#20 TWITCHin

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Posted 13 April 2006 - 09:55 PM

spring perches should be the same. first thing i would think you waould have to change would be the pinion yoke on the 14 bolt. is it a 10.5" 14 bolt, from a 3/4 ton? if so it may use different u-joints. not sure what sizes are used on the new trucks but a simple pinion yoke swap to match the u-joints on the truck isnt a big deal. might even be able to swap the whole 2500 driveline to the 1500, as long as it is the same length and the two trucks have the same t-case. not sure if they do though.

#21 snoman

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Posted 28 May 2006 - 05:30 PM

As stated above, my '05 2500HD 6.0L has the 10.5" full floater.  Apparently it's also an AAM axle, the 1050.  AAM was a "spin off" from GM a while back.  So I think some people refer to AAM axles as "corporate" axles.

Here are the specs from AAM's web site:

Axle / Gear / Capacity
1050    10.5    4545 kg (10,000 lbs)
1150    11.5    4900 kg (10,900 lbs)

<{POST_SNAPBACK}>



In looking through this old post, I am not sure where poster got this info but it is not correct. The 10.5 and 11.5 AAM rear axle in single SRW config are both good to about 4 tons, The difference is in rated input torque capacity. The 10.5 is rated at about 2600 ft lbs and the 11.5 at about 3100 ft lbs (at pinion yoke input) THis is about 40 percent of design load limit which is still below point of failure a little bit. SO what this means is that a 10.5 corp rear axle can handle around 6000 ftlbs of input torque for short busrts and the 11.5 about 8000 ft lbs. It is not really that much stronger than a 10.5 as the 10.5 is kinda legendary in its durabilty in lifted 4x4s with really big rubber. Even the 9.5 14 bolt is good to about 2100 ftlbs and the 10 bolt is rated at about 1500 ftlbs using same 40% standard. Axle shaft capacities easy to calculate so that it can be factored in gear ratio and the approximate torque input failure point can be determined (if it is reaced before ring, pinion and carrier reach theirs)
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#22 mmmikkke

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Posted 28 May 2006 - 09:28 PM

As stated above, my '05 2500HD 6.0L has the 10.5" full floater.  Apparently it's also an AAM axle, the 1050.  AAM was a "spin off" from GM a while back.  So I think some people refer to AAM axles as "corporate" axles.

Here are the specs from AAM's web site:

Axle / Gear / Capacity
1050    10.5    4545 kg (10,000 lbs)
1150    11.5    4900 kg (10,900 lbs)

<{POST_SNAPBACK}>

In looking through this old post, I am not sure where poster got this info but it is not correct...

<{POST_SNAPBACK}>

The "info" I provided is 100% accurate; anybody-but-snowman can email me and I'll provide you the links to see for yourself.
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#23 snoman

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Posted 28 May 2006 - 11:33 PM

As stated above, my '05 2500HD 6.0L has the 10.5" full floater.  Apparently it's also an AAM axle, the 1050.  AAM was a "spin off" from GM a while back.  So I think some people refer to AAM axles as "corporate" axles.

Here are the specs from AAM's web site:

Axle / Gear / Capacity
1050    10.5    4545 kg (10,000 lbs)
1150    11.5    4900 kg (10,900 lbs)

<{POST_SNAPBACK}>

In looking through this old post, I am not sure where poster got this info but it is not correct...

<{POST_SNAPBACK}>

The "info" I provided is 100% accurate; anybody-but-snowman can email me and I'll provide you the links to see for yourself.

<{POST_SNAPBACK}>



It is not because I have the GM dealer "books" here and no 14 bolt 10.5 made was EVER rated at 10K load capacity. (they used a D70 in old dulies, not a 14 bolt and they use a different axle in NBS dualies too). Your link is likely as bogus as the rating. Put 10k on a 14 bolt 10.5 and it will not last long, Same with SRW 11.5 AAM. Also while GM offers a 11K axle in their cab and chassis it is not the 11.5 AAM and it has 10 lug bolt wheels too, not 8. I had a 05 dump bed for a few weeks last summer and it had optional 11k axle in it with 10 lug wheels and it was no 11.5 AAM. It was far more massive. You need to do a little more research on the matter instead of just reading a link. I can tell you what axles GM used in their trucks front and rear from the late 50's till now and I even had a truck once that had the old bulletproof removable pig Eaton 11.5 and it that was easily a match for a 11.5 AAM but would cost a lot more to build today. Also, one more thing, there is two 14 bolt 10.5 AAM's out there now, one version that came out in about 2002 that Dodge uses in some trucks with just two pinion bearings (Dodge also uses the AAM 11.5 in some models) and the old style GM corp with 3 bearings and a stradle mounted pinion in a removable cage (which the new version does not have to save cost) Also since 03 Dodge started using a 9.25 AAM front axle in their HD pickups that uses same ring and pinion as a GM 9.25 IFS. I can go on and even calculate the axle shaft strengths in the axles based on size and material used (GM usually uses 1040 alloy) but what is the point.

Edited by snoman, 28 May 2006 - 11:39 PM.

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#24 mmmikkke

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Posted 29 May 2006 - 08:43 AM

I think I detect some defensive backfilling. I stand by my numbers, and my offer.
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#25 Tommy R

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Posted 02 January 2008 - 09:30 PM

I would assume my '99 K2500 Suburban has a 9.5" 14 bolt rear axle. Most of the talk here is of the NBS trucks. Can anyone tell me how I could determine if I have a 9.5" or 10.5" axle? FWIW, the rear end looks like a 14 bolt and, of course, has 14 bolts holding the diff cover on. So I think it's a safe assumption that it's got a 14 bolt, but I don't know the details other than it's got 4.10s and a limited slip diff (G80).

Thanks,

Tommy

#26 genuinefine409

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Posted 02 January 2008 - 09:51 PM

I would assume my '99 K2500 Suburban has a 9.5" 14 bolt rear axle. Most of the talk here is of the NBS trucks. Can anyone tell me how I could determine if I have a 9.5" or 10.5" axle? FWIW, the rear end looks like a 14 bolt and, of course, has 14 bolts holding the diff cover on. So I think it's a safe assumption that it's got a 14 bolt, but I don't know the details other than it's got 4.10s and a limited slip diff (G80).

Thanks,

Tommy


http://coloradok5.com/axleguide.shtml

#27 Tommy R

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Posted 02 January 2008 - 10:08 PM

http://coloradok5.com/axleguide.shtml



Thanks. It's interesting that that page says Suburbans up to '91 had the small 14 bolt, but that's what it looks like mine has.

#28 genuinefine409

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Posted 02 January 2008 - 10:34 PM

http://coloradok5.com/axleguide.shtml



Thanks. It's interesting that that page says Suburbans up to '91 had the small 14 bolt, but that's what it looks like mine has.



it says the 10.5 was used 73-87 but my 02 has it. :D

#29 Korbin502

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Posted 18 January 2010 - 09:18 AM

Vernon,

Your dealer is incorrect. If you have the big block or diesel in your '01 2500HD, it has the AAM 1150 rear axle, which is a full-floater.



This is an old string but I wanted to clear this up for anyone in the future. I just pulled the rear end on my truck, a 2001 GMC Sierra 2500HD Allison Trans with the 8.1, and found that I have a 10.5" ring gear. So, the rule about all 8.1's having an 11.5" ring gear is bunk! I almost went and bought all of the wrong parts after reading this string. Good thing I did'nt!

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#30 Korbin502

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Posted 12 February 2010 - 09:56 PM

I can admit when I am wrong. My truck does in fact have the 11.5 ring gear. After the rear end was pulled I was told it was a 10.5. Auto Zone, Kragen, Star Auto and Napa all sold me parts saying that it was either a 9.5 or 10.5. ( No one had all of the parts I needed so I had to get one item per store). The only time I got the right parts for this whole ordeal, was when I went to the Chevy dealership. I had to return everything I got from the other shops. I could not believe that every single shop told me that the 2500HD does not have an 11.5 Ring Gear. I had them look up a 3500 for me just to check to see if the parts for an 11.5 would be correct and they were. If you need parts for the rear end of your HD and you go to one of the stores listed above, I suggest you tell them you have a 3500, or an 11.5 Ring Gear. Good luck!

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01 GMC SIERRA 2500HD SLT 4X4 8.1 ALLISON 174,000 MILES
1996 Chevy LT3500 Dually Vortec 454





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