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-   -   AK1085 diffy (http://www.clubcobra.com/forums/ac-mkiv/148022-ak1085-diffy.html)

1985 CCX 12-14-2024 01:48 PM

AK1085 diffy
 
3 Attachment(s)
I wanted to start a thread detailing the changes planned for the rear differential of AK1085.
As most of you may know these cars come with a 3.07 rear end which is a bit anemic for use in a cobra type vehicle.
Considering many modifications around the motor, which is a 302, there are a plethora of offerings however you’re still gonna be plagued by the fact that the rear end gear is 3.07, fifth gear is not attainable until over 85 miles an hour currently.
Common sense dictates the changing the rear end from a 3.07 to a 3.54 should help delivery of the power it currently has.
So with the help of Mitchell’s Differential, I took a Diffy from another MKIV and modified it with all new gears, seals and bearings taking it to a 3.54 retaining the original posi-traction rear end.

I also have a 3.31 getting re-bearing and re-sealed for possible use of the 3.54 is not what I like.
Never hurts to have spares……….. :p

Before install I will paint it red with the rear cover black so it at least matches what they once were.

Mark IV 12-15-2024 02:00 AM

Jeff,

I have the speedo gear you will need for both ratios.

1985 CCX 12-15-2024 09:04 AM

Awesome
Project commencing after the 427 install on the other car.

mrmustang 12-15-2024 10:12 AM

Will be watching your progress, as I'm watching the market for a second hand "AK" that is currently collecting dust in an owners garage awaiting to be rescued by someone like me with too much time on his hands :D .




Bill S.


PS: Any leads, or ideas were to look would be greatly appreciated

1985 CCX 12-15-2024 06:39 PM

1 Attachment(s)
Bill

Hope you join the AC group.

mrmustang 12-16-2024 07:01 AM

Quote:

Originally Posted by 1985 CCX (Post 1526440)
Bill

Hope you join the AC group.


I belong to so many groups, I've lost track. Is it a facebook, forum based, or ???? Feel free to PM me so I can figure out if I belong already or not.


Thanks again




Bill S.


PS: Is this the one where Hurley is trying to rewrite history, over, and over, and over, and over again? If so, I belonged, but left long ago as it was not worth beating my head against the brick wall of his "family legacy".

767Jockey 12-17-2024 11:25 AM

Quote:

Originally Posted by mrmustang (Post 1526445)
I belong to so many groups, I've lost track. Is it a facebook, forum based, or ???? Feel free to PM me so I can figure out if I belong already or not.


Thanks again




Bill S.


PS: Is this the one where Hurley is trying to rewrite history, over, and over, and over, and over again? If so, I belonged, but left long ago as it was not worth beating my head against the brick wall of his "family legacy".

Bill, who is "Hurley"? I'm unfamiliar with the name.

mrmustang 12-17-2024 12:47 PM

Quote:

Originally Posted by 767Jockey (Post 1526452)
Bill, who is "Hurley"? I'm unfamiliar with the name.


Spelling might be off, close if not dead on.



Son, grand son, or nephew of the original 60's owners of "AC". His "take" on anything cobra, CS, or later AK related is slightly off kilter.


I'll leave it at that.

Harpoon PV2 12-17-2024 11:34 PM

Quote:

Originally Posted by mrmustang (Post 1526454)
Spelling might be off, close if not dead on.



Son, grand son, or nephew of the original 60's owners of "AC". His "take" on anything cobra, CS, or later AK related is slightly off kilter.


I'll leave it at that.

AC Cars LTD was owned by Charles and his nephew Derek Hurlock during the Cobra days. They were incredibly wealthy, and while AC Cars was small, they owned some 24 other company's, with government contracts, so the cars were a hobby, they could have bought the entire Shelby company out of petty cash. it was Carrol that took more and more liberties with the truth, as time went by. Just look at CSX2000 and an Ace 2.6, and you will see that Shelby and Ford did not completely redesign the car. Don't get me wrong, no Carrol no Cobra, conversely, no AC no Cobra, because he was pretty much out of English car makers! Cheers, Dennis

CobraAddict 12-27-2024 10:30 PM

Will this not make 1st and 2nd particularly low off the mark? Especially 1st!?

Thor maine 12-28-2024 09:30 AM

looks just like the jaguar type center section?

incoming 12-28-2024 02:47 PM

3.54 will be just fine.

1985 CCX 12-30-2024 09:08 AM

Quote:

Originally Posted by Thor maine (Post 1526564)
looks just like the jaguar type center section?

That is what AC used, 4HU type.
Very strong
Great internals especially the old school posi

Thor maine 12-31-2024 09:37 AM

Quote:

Originally Posted by 1985 CCX (Post 1526582)
That is what AC used, 4HU type.
Very strong
Great internals especially the old school posi

Yup it's a DANA 44

1985 CCX 01-01-2025 07:35 PM

Indeed, the old school stuff as they tell me the newer stuff is not as rugged.
This place doea a bunch of offroad applications and thus seem to know...
They are a Dana Dealership as well.


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