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750HP 555- REAR DIFF - Detroit WITH VanSteel???

 
Old 04-09-2019, 09:09 PM
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Justin Braune
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Default 750HP 555- REAR DIFF - Detroit WITH VanSteel???

Gents, installing a Pat Musi 555 ci 750hp engine into my 69 C3. I've purchased a SST Tremec T56 Magnum and am now on the rear section figuring out the rear diff and suspension.

I have VanSteel up front and am OK with VanSteel in the rear (looking at their 12 bolt version), but the more I look at the Detroit Speed Hammerhead 12 Bolt rear differential, the more I think I want it - BUT I don't want to spend the rest of the $10k for what I can get from VanSteel for $5k.

CAN YOU MIX DETROIT SPEED REAR DIFFERENTIAL WITH VANSTEEL SUSPENSION???

https://www.vansteel.com/index.cfm?f...p=3031&ID=3272

https://www.detroitspeed.com/1963-19...orvette-070650

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Old 04-09-2019, 10:15 PM
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good luck, and I wish I had your problem lol
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Old 04-09-2019, 11:42 PM
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Waiting for GRT1999
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Old 04-10-2019, 12:05 AM
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My advise would be to PM Mike Dyer (tracdogg2) or Gary (GRT1999) and have one of them build your differential for you, over purchasing one off the shelf.
Both build top quality 10 or 12 bolt units, are well respected in the industry and I've heard nothing but good comments from happy customers here on the forum.

Last edited by OldCarBum; 04-10-2019 at 12:06 AM.
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Old 04-10-2019, 04:11 AM
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Gunfighter13
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I think the HammerHead has some good design improvements over the standard differential (ie: like Vansteel version) being modified. Some of those are a case that was designed with better oiling of pinion and gears, better axle retention, larger bearings, wider range of gear selection due to case design. Does your car need all of that? That is your choice. Will the modified 12 bolt converted differential work, you bet.
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Old 04-10-2019, 01:21 PM
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Justin Braune
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Does a car running 750hp need a 12 bolt?
Is it cheaper to do it "right" the first time?
Is the VanSteel one going to blow up on me?
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Old 04-10-2019, 01:31 PM
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With a six speed you need the 12 bolt. I would make a couple phone calls to get all the details of a properly built unit.
Phone calls are free.
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Old 04-10-2019, 01:41 PM
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Here is video of demon aluminum housings at drag strip.
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Old 04-10-2019, 06:19 PM
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OldCarBum
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Originally Posted by Justin Braune View Post
Does a car running 750hp need a 12 bolt?
Is it cheaper to do it "right" the first time?
Is the VanSteel one going to blow up on me?
10 or 12 bolt really depends on how you plan to drive the car.
Also remember a 12 bolt limits you to 3.73 or 4.11 rear gears.
If you ever want to run 3.36 or 3.55 gearing, the ring and pinion won't fit in the 12 bolt housing.
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Old 04-10-2019, 09:36 PM
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Originally Posted by OldCarBum View Post
10 or 12 bolt really depends on how you plan to drive the car.
Also remember a 12 bolt limits you to 3.73 or 4.11 rear gears.
If you ever want to run 3.36 or 3.55 gearing, the ring and pinion won't fit in the 12 bolt housing.
That is where the Hammerhead is different. Any 12 bolt gear ratio can be used.
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Old 04-10-2019, 10:04 PM
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Here is some good info on the hammerhead.
https://www.lsxmag.com/features/pri-...n-irs-12-bolt/
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Old 04-11-2019, 12:23 AM
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427Hotrod
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Depending on if you want to do any fabricating...there are 9" and Dan 60 IRS center sections out there the days that could easily be installed with some halfshafts. They already have the inner stubs in place.

My car has a Dana 60 IRS we built almost 15 years or so ago. Haven't touched it since installing it with years of pounding on slicks and a stick trans with from 800-1400 HP.

Would be easier these days.


JIM
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Old 04-11-2019, 07:27 AM
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GTR1999
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Finding a DANA 60 like Jim has would probably be the strongest but also not an easy find and the last used one I saw was $5000.

All comes down to your application- power- trans- traction and your right foot. I have one of my super 10's in a 700+hp car, against my advice as that is really 12 bolt territory but it is holding up and is being abused! Again not what I would recommend but the point being you are the final judge. If you are going to launch the car hard, really hard, then I would recommend Tom's 12 bolt 1480 setup. Who builds it is not the question posed here. You are best served to call Jo Watt and see what she still has for the 12 bolts. Not all builders use the same parts, some cut corners to puff up sales. Doing your homework before opening your wallet will save you a lot of stress and money. I have coached plenty around the world on how to build these, maybe it is something you might consider if you have good tools, measuring tools, and access to a mill, lathe and surface grinder.

The 9" and 12-bolt are close to each other, typically fans of each think theirs is the best. A solid 9" kit is available for less then the other options. If you want to stay with an IRS Tom's 12 bolt setup will work and cost less then the other options although the ratios are limited to 373-411-456.

Now how they are built is a different story, one I am not going to get into on this thread, other then to say they are not all the same.

Good luck

Last edited by GTR1999; 04-11-2019 at 07:28 AM.
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Old 04-17-2019, 01:16 PM
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OK SO I figured out what I'm doing. Mike Dyer @tracdogg2 will be making me a bitchin 12 bolt rear diff in 3.73, and we're going with 1480 and VanSteel rear coilovers.
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Old 04-18-2019, 01:46 AM
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For those who read this thread now and in the future, I will say that Gary (GTR1999) and Mike Dyer (tracdogg2) are the two top builders of rear differentials for Corvettes.
Both are equal in strength, design, and quality.
You can not go wrong with either one.
It was an impossible decision for me to pick one over the other, because during my research I could not find a negative comment or review.
Both these men have helped numerous members of this forum (including myself) and enthusiasts of our hobby by answering questions, giving excellent advise and providing a quality product.
Thanks to both of you.
Greg
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Old 04-19-2019, 10:06 AM
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Originally Posted by OldCarBum View Post
For those who read this thread now and in the future, I will say that Gary (GTR1999) and Mike Dyer (tracdogg2) are the two top builders of rear differentials for Corvettes.
Both are equal in strength, design, and quality.
You can not go wrong with either one.
It was an impossible decision for me to pick one over the other, because during my research I could not find a negative comment or review.
Both these men have helped numerous members of this forum (including myself) and enthusiasts of our hobby by answering questions, giving excellent advise and providing a quality product.
Thanks to both of you.
Greg


I went with Gary for my 12 bolt and T-arm rebuild since he had done my steering box before. I was also local for a while, had visited him at the shop and seen what he did, plus had family nearby to help with component transportation. Either Gary or Mike will do an excellent job.
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Old 04-25-2019, 04:03 PM
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Members in this thread have discussed prices of different options. We all perceive parts as being reasonable or expensive depending on our individual budget. All parts have the potential for breakage regardless of the builder or manufacturer. Can someone give me a firm price on building a “Super 10” (I have a good case and ‘79 carrier) or 12 bolt?
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Old 04-25-2019, 05:16 PM
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Originally Posted by zr1topsportsman View Post
Members in this thread have discussed prices of different options. We all perceive parts as being reasonable or expensive depending on our individual budget. All parts have the potential for breakage regardless of the builder or manufacturer. Can someone give me a firm price on building a “Super 10” (I have a good case and ‘79 carrier) or 12 bolt?
I would call Mike or Gary, tell them what you want, listen to their advise, get their recommendations and get a price quote.
Both will want to know, hp and torque output of your motor, transmission type, rear gearing and how you plan to use and drive your car.
Rear differentials are like all the other components in your build.
Going fast, driving hard or just running the big hp and torque costs money if you want things to stay together.
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