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10-10-2007, 02:28 PM
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Hummer Veteran
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Join Date: Nov 2006
Location: Fantasy Island / The Tiny Kingdom !
Posts: 134
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The Alpha's cast iron front diff....
Will it fit the 3.5 / 3.7 H3's ? - if so, when can we order??
My front diff went around 3mths ago, got it replaced under warranty, BUT it had a whine coming from it which the dealer "couldn't hear" (6 times) until I took it for a service - asked them to look, and hey presto the replacement THEY fitted was daffy ducked  seems like when they installed the "new" diff, they used the original casing(??), which obviously had flexed to the point it doesn't line up - so here I am waiting for another 2 weeks (diff ordered from the US) to get the car back 
Mind they gave me loaner H3 which is getting ahem.... used
Cheers
JFF
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10-10-2007, 02:40 PM
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Hummer Guru
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Join Date: Sep 2005
Location: fort salonga ny
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Re: The Alpha's cast iron front diff....
I dont think it would be a simple swap,the cast diff is 411 gears we have 456 gears in the 5 cyl H3's.
I guess if replaced as a set (front/rear diff ) it might work but it would be costly and changing to a lower gear could change performance/ MPG.
The 456 gears might be able to be used in the cast diff housing ?If so that be the best way.
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Last edited by fourfourto : 10-10-2007 at 02:43 PM.
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10-10-2007, 03:26 PM
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Hummer Veteran
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Join Date: Mar 2005
Location: Sugarland Texas
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Re: The Alpha's cast iron front diff....
Yes it will fit just fine. I have done this to my sons truck. Just order the cast iron diff housing and you can put the 456 gears from the old one into the new one. Its a easy swap.
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10-10-2007, 05:54 PM
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Hummer Expert
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Join Date: May 2005
Location: Southern California
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Re: The Alpha's cast iron front diff....
Auggie Mathis-Good Job
Maybe you should start a diff swap service
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Desert Dan
H3 2006 Adventure/Lux/5-speed/sunroof/rock rails/underbody skids/block heater/Boulder Grey/ Defender Roof Rack
Jeep TJ Rubicon 2003
1988 Jeep Cherokee
Gone - But- Not Forgotten 4x4's
1994 Jeep YJ
Toyota 4x4 Truck(s)
1970 Jeep CJ-5
1962 Willys Wagon
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10-10-2007, 08:08 PM
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Hummer Veteran
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Join Date: Mar 2005
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Re: The Alpha's cast iron front diff....
Now I just need to find a locker that will fit in there.
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10-10-2007, 08:40 PM
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Hummer Expert
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Re: The Alpha's cast iron front diff....
Maybe ARB will make a locker for the front?
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Desert Dan
H3 2006 Adventure/Lux/5-speed/sunroof/rock rails/underbody skids/block heater/Boulder Grey/ Defender Roof Rack
Jeep TJ Rubicon 2003
1988 Jeep Cherokee
Gone - But- Not Forgotten 4x4's
1994 Jeep YJ
Toyota 4x4 Truck(s)
1970 Jeep CJ-5
1962 Willys Wagon
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10-10-2007, 09:13 PM
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Hummer Guru
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Join Date: Jul 2005
Location: nonpiker
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Re: The Alpha's cast iron front diff....
Quote:
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Originally Posted by Auggie Mathis
Now I just need to find a locker that will fit in there.
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Try the rear one  |
10-13-2007, 01:10 AM
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Hummer Expert
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Join Date: Mar 2005
Posts: 513
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Re: The Alpha's cast iron front diff....
Quote:
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Originally Posted by Auggie Mathis
Now I just need to find a locker that will fit in there.
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Maybe you'll be able to go to your Hummer Dealer and order one in the future. |
10-11-2007, 07:09 AM
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Hummer Veteran
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Join Date: Nov 2006
Location: Fantasy Island / The Tiny Kingdom !
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Re: The Alpha's cast iron front diff....
Quote:
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Originally Posted by Auggie Mathis
Yes it will fit just fine. I have done this to my sons truck. Just order the cast iron diff housing and you can put the 456 gears from the old one into the new one. Its a easy swap.
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Great, will ask the dealer today if they can order one.... and if they have any workshop staff actually capable of doing it properly 
Bit of history on that one
Cheers
JFF 
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Black Sheep Hummer Squadron - Arabian Gulf Chapter
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10-11-2007, 08:14 PM
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Hummer Authority
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Join Date: Aug 2006
Location: Oregon
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Re: The Alpha's cast iron front diff....
Quote:
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Originally Posted by Auggie Mathis
Yes it will fit just fine. I have done this to my sons truck. Just order the cast iron diff housing and you can put the 456 gears from the old one into the new one. Its a easy swap.
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Do you have the part # for the cast iron front diff? Any pics of your install?
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Black Sheep Hummer Squadron
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10-11-2007, 09:25 PM
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Hummer Expert
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Join Date: May 2005
Location: Southern California
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Re: The Alpha's cast iron front diff....
I wonder if you can order it with the diff gears and carrier inside ready to bolt in. Then it would be an easy install.
__________________
Desert Dan
H3 2006 Adventure/Lux/5-speed/sunroof/rock rails/underbody skids/block heater/Boulder Grey/ Defender Roof Rack
Jeep TJ Rubicon 2003
1988 Jeep Cherokee
Gone - But- Not Forgotten 4x4's
1994 Jeep YJ
Toyota 4x4 Truck(s)
1970 Jeep CJ-5
1962 Willys Wagon
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10-11-2007, 10:06 PM
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Hummer Veteran
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Join Date: Mar 2005
Location: Sugarland Texas
Posts: 43
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Re: The Alpha's cast iron front diff....
The housing part # is 15920599. Sorry i did not take any pics. And no you cant order it with non alpha gears.
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