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390 gears. Where to get them?

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Old Aug 1, 2003 | 10:41 PM
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Default 390 gears. Where to get them?

I am wanting to do the 390's, and I am curious as to where to get them from. I am also considering just getting the gears and installing them in the diff. myself. Anyone with any experience doing this yourself? Anything else to get other than the gears? seals, gaskets or anything else.
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Old Aug 1, 2003 | 11:37 PM
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Default Re: 390 gears. Where to get them? (dave777)

This is not a diy project. Even the pros can have a tough time rebuilding a diff.

I just had a set of 4.10's from DynoTech put in and they're smooth and silent. I definitely recommend DTE and they are a forum vendor. Talk to Phil there (link is on the list on the left of the screen) and he'll fill you in on anything you want or need to know concerning a gear swap.
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Old Aug 1, 2003 | 11:42 PM
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Default Re: 390 gears. Where to get them? (dave777)

http://www.drivetrainsuperstores.com .The cheapest I've found yet.
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Old Aug 2, 2003 | 12:56 AM
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Default Re: 390 gears. Where to get them? (Patches)

This is not a diy project. Even the pros can have a tough time rebuilding a diff.
According to several shops in SoCal, it takes special tools and knowledge and I haven't found one place here that will install a ring & pinion in a C5. I'm going to buy a rear diff. with 4.10s and install it myself. Should save about $1,000 doing it myself ( west coast prices ). :cheers:
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Old Aug 2, 2003 | 06:25 AM
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Default Re: 390 gears. Where to get them? (dave777)

So if I do end up getting the differential assy. what is the best price?
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Old Aug 2, 2003 | 01:10 PM
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Default Re: 390 gears. Where to get them? (dave777)

???
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Old Aug 2, 2003 | 02:29 PM
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Default Re: 390 gears. Where to get them? (dave777)

I'm going to buy a rear diff. with 4.10s and install it myself. Should save about $1,000 doing it myself
Your a better man than I! :lol: :lol:
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Old Aug 2, 2003 | 05:28 PM
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Default Re: 390 gears. Where to get them? (dave777)

check our forum vendor Andy at http://www.aandacorvette.com


[Modified by kewlbrz, 8:44 PM 8/3/2003]
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Old Aug 2, 2003 | 06:43 PM
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Default Re: 390 gears. Where to get them? (kewlbrz)

dave777-
Here is our complete menu of differential options for you to choose from. Many people on this board are running our diffs., so you may want to poke around the board a bit to find out what they think of them.
http://www.dynotech-eng.com/dte_c5_diff.htm

Keep this in mind Dave...... We have found that there is only ONE right way to ugrade these things for performance and durability and that is how we do it. You may find someone else to do it "cheap", but that is what you will pay for..... If one of these units breaks from poor component installation/application of any kind, it is VERY expensive to repair/replace the second time around.

We've experimented (and sometimes failed) with many different combinations and building methods to find out what works best and have stuck with that successful method to this day, with no failures or negative durability issues.

Just some food for thought, as everyone has different budgets. Bottom line- Get the absolute best that you can afford and drive accordingly. HTH's :)

Regards,
Phil Rickard
President/Owner
Dynotech Engineering, Inc.
www.dynotech-eng.com
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Old Aug 2, 2003 | 07:08 PM
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Default Re: 390 gears. Where to get them? (dave777)

Zip Products also builds them in house. We have not been advertising it much yet. As far as our performance with them feel free to ask David Farmer, our diffs are in his World Challenge car and also Jim Rathmann's.
We offer several different options so it is better for me to talk to each individual customer who is wanting one. I anyone other the is racing, we have a severe duty which upgrades to a 8 clutch carrier and of course the 300M HD axle, plus the housing is ARP studded and the carrier bolts are all safety wired. The entire unit is also Thermo-cycled. We can do any custom rear for a customer however the 8 clutch setup is not recommended for the street. We can be reached at 800-962-9632ext256
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Old Aug 3, 2003 | 12:18 AM
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Default Re: 390 gears. Where to get them? (DynoTech Engineering)

I realize that I need to go with high quality, and I always have. I am just wondering why no-one seems to be doing the gear installs themselves. I do not understand as to why it is so much different than any other rear end that I have built. I am not saying that I am a pro at this stuff, but I have built several Ford nine inch and GM 12 bolt rear ends with no issues. I am wondering if it is worth the money, when you can buy the gears for 350 to 400. Is it really worth 1100. There must be a reason, I was just curious. Thanks for the info Phil, by the way you seem to have about the best price, I will be giving you a call later this week. :)
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Old Aug 3, 2003 | 08:00 AM
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Default Re: 390 gears. Where to get them? (dave777)

Dave, to try and answer your question succinctly, C-5 Tech, a highly-regarded Corvette tech and long-time member of this forum, has warned against all but the most experienced taking on this job - and even those need the proper training. The gear alignment procedure from GM is 18 pages long. If C-5 Tech says hands-off, that's good enough for me.

Phil will hook you up. I'm very happy with his gears and service. :cheers:
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Old Aug 3, 2003 | 11:15 AM
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Default Re: 390 gears. Where to get them? (DynoTech Engineering)

dave777-
Here is our complete menu of differential options for you to choose from. Many people on this board are running our diffs., so you may want to poke around the board a bit to find out what they think of them.
http://www.dynotech-eng.com/dte_c5_diff.htm

Keep this in mind Dave...... We have found that there is only ONE right way to ugrade these things for performance and durability and that is how we do it. You may find someone else to do it "cheap", but that is what you will pay for..... If one of these units breaks from poor component installation/application of any kind, it is VERY expensive to repair/replace the second time around.

We've experimented (and sometimes failed) with many different combinations and building methods to find out what works best and have stuck with that successful method to this day, with no failures or negative durability issues.

Just some food for thought, as everyone has different budgets. Bottom line- Get the absolute best that you can afford and drive accordingly. HTH's :)

Regards,
Phil Rickard
President/Owner
Dynotech Engineering, Inc.
www.dynotech-eng.com
:iagree: Very well stated :smash:
If I were to upgrade, this is the kind of company I would go with. If the price was more than my budget would allow at the time, I'd wait 'till the budget got better.
Fortunately I have a friend in my area that has all the proper tools and abillity, but if I didn't Dynotech would be my first choice. :yesnod:

Good Luck
Mike :flag
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Old Aug 3, 2003 | 03:02 PM
  #14  
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Default Re: 390 gears. Where to get them? (Mikie C)

One last note....

In a very short time, (less than a month) we will be offering 5 different performance stages of our differentials for one to choose from depending on the power output of their engine combinations.

They range from our most common w/out the HD shaft, w/ the left side HD shaft, w/ both sides of HD shafts, 20 disc clutch packs (O.E. is 16) HD fasteners and cryo-treated internals/case assemblies. We have already produced these for two gentlemen in sub-professional racing and they will be posted on our website VERY soon.

jabbot-
Interesting post, as I too was formerly a crew member of a SCCA Pro-Racing World Challenge Team for two years for which I was responsible for engine building and driveline durability for the C5. :steering: It's a small world! :)

Happy Motoring! :auto:


Best Regards,
Phil Rickard
President/Owner
Dynotech Engineering, Inc.
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Old Aug 3, 2003 | 10:57 PM
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Default Re: 390 gears. Where to get them? (dave777)

Got mine from COH. Main concern for me was that they be quiet as stock. And they were. Of course this was the "3rd" member set up by COH.

Gary
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