Drive Shaft Flex Discs - Hyundai Genesis Forum
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post #1 of 183 Old 11-20-2013, 07:13 PM Thread Starter
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Drive Shaft Flex Discs

Good news...

Found that my flex discs (sometimes called Guibos) on the end of my propeller (drive) shaft are cracking and it is time to replace them. This is good in that I caught it before a major failure.

Bad news...

Hyundai, unlike Mercedes, BMW, etc., does not sell these wear item flex discs on there own. You must buy the entire propeller shaft to the tune of $800-$1200 depending on where you go to get it.

Perfect...thanks Hyundai...

Trying to see if I can find one from another platform that is the same size to use or if there is a company that makes these that I can contact about getting into our market to make them for the Gen Coupe.

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post #2 of 183 Old 11-20-2013, 07:49 PM Thread Starter
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Looks like our best bet is to find flex discs off a low mileage totaled donor car.

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post #3 of 183 Old 11-21-2013, 12:13 AM
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Just out of curiosity,how did u find out its cracked?did the car drive or feel different?
I'm just asking coz I'm running 125k kms and don't know if I should be worried
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post #4 of 183 Old 11-21-2013, 01:48 AM
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Wow, they really don't sell them separately. Just checked

Ever thought about getting a solid aluminum puck made?

Or even a custom shaft?

I understand that you don't want to spend all the money, but averaging $1000 for oem, you can get a decent custom one.
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post #5 of 183 Old 11-21-2013, 04:37 AM Thread Starter
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Quote:
Originally Posted by omran View Post
Just out of curiosity,how did u find out its cracked?did the car drive or feel different?
I'm just asking coz I'm running 125k kms and don't know if I should be worried
Usually it is a visual inspection during other routine maintenance once you pass 60k (or the equivalent KMs) every oil change while the car is on the lift/jack stands. You will easily start seeing the cracks when they begin to wear out.

You may also notice more vibration from the drive train right under your seat as well as klunks when pulling away from a stop of engine braking (if you have M/T for the second one).

I found out by visual inspection when I had the driveshaft out while putting in the new clutch because Terrance pointed it out.

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2012 Hyundai Genesis Coupe 3.8L V6 Track M/T in Interlagos Yellow (Fei) - Active
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post #6 of 183 Old 11-21-2013, 04:40 AM Thread Starter
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Quote:
Originally Posted by AKGC View Post
Wow, they really don't sell them separately. Just checked

Ever thought about getting a solid aluminum puck made?

Or even a custom shaft?

I understand that you don't want to spend all the money, but averaging $1000 for oem, you can get a decent custom one.
There is already one piece Aluminum and Carbon shafts out there. Also, I can get the OEM new for $700ish. I don't want to go Aluminum flex disc even though I know some companies that could make a custom one just because it doesn't provide the sane flex and on modded cars could lead to premature failure of other parts.

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2010 Hyundai Genesis Coupe 3.8L V6 Track M/T in Mirabeau Blue (Eva) - Retired
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2012 Hyundai Genesis Coupe 3.8L V6 Track M/T in Interlagos Yellow (Fei) - Active
Bought - 22,000 miles, Currently - 83,000 miles, Total Miles - 61,000 miles

Total Miles in a Genesis Coupe - 206,000 miles

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post #7 of 183 Old 11-21-2013, 09:04 AM
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Did the '13s replace these with actual U-joints? If so would it be possible to upgrade to these parts?

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post #8 of 183 Old 11-21-2013, 09:17 AM
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Quote:
Originally Posted by BHBomber View Post
Did the '13s replace these with actual U-joints? If so would it be possible to upgrade to these parts?
I believe the disc is there to dissipate torque load on the diff, not to be an actual laterally flexing joint.
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post #9 of 183 Old 11-21-2013, 09:28 AM Thread Starter
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No, the 13s use flex discs still. Confirmed by Snoopy.

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post #10 of 183 Old 11-21-2013, 09:56 AM
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These guys have some universal ones, compare carefully and you might get lucky.
Poly Flex Group Pty Ltd

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post #11 of 183 Old 11-21-2013, 11:20 AM Thread Starter
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Quote:
Originally Posted by ControlFreak View Post
These guys have some universal ones, compare carefully and you might get lucky.
Poly Flex Group Pty Ltd
Interesting. Thanks for the heads up. I will look into that.

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2012 Hyundai Genesis Coupe 3.8L V6 Track M/T in Interlagos Yellow (Fei) - Active
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Total Miles in a Genesis Coupe - 206,000 miles

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post #12 of 183 Old 11-21-2013, 11:26 AM
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or get an aluminum drivesaft made
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post #13 of 183 Old 11-21-2013, 11:48 AM Thread Starter
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Quote:
Originally Posted by Roly D Sauce View Post
or get an aluminum drivesaft made
You could do that anf there are already companies that do, but the driveshaft is fine. Just need the flex couplers. Its the difference between a $200 fix versus a $800-$1000 fix. I am on a budget right now and don't have that kind of money.

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2010 Hyundai Genesis Coupe 3.8L V6 Track M/T in Mirabeau Blue (Eva) - Retired
Bought - 25 miles, Retired - 145,000 miles, Total Miles - 145,000 miles

2012 Hyundai Genesis Coupe 3.8L V6 Track M/T in Interlagos Yellow (Fei) - Active
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Total Miles in a Genesis Coupe - 206,000 miles

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post #14 of 183 Old 11-21-2013, 02:50 PM
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Since I barely ever contribute:

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... "Big name" shops live off of kids like this. Enough money to buy super sweet marked up name brand parts at MSRP and then pay outrageous labor rates all day long to have a car that could have made the exact same power for significantly cheaper that will run ten times better... ... That's when people just pay out the ass 24/7 for the rest of their lives.
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post #15 of 183 Old 11-21-2013, 02:53 PM Thread Starter
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Originally Posted by ElDominio View Post
Since I barely ever contribute:
Nice! I am not a fan of the Revshift all aluminum flex disc myself, but if you could find out what BMW that size fits model wise, we could order and use the BMW OEM ones. Can you please clarify what model BMW that size is for please?

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2010 Hyundai Genesis Coupe 3.8L V6 Track M/T in Mirabeau Blue (Eva) - Retired
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2012 Hyundai Genesis Coupe 3.8L V6 Track M/T in Interlagos Yellow (Fei) - Active
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post #16 of 183 Old 11-21-2013, 03:00 PM
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From revshift site...

This is the 105mm flex disc with 12mm bolt holes. It is commonly found on 2006 and newer vehicles. Please refer to the cross reference links below.

The Revshift high performance flex disc is CNC machined from 6061 billet aluminum. It utilizes high quality polyurethane bushings to maximize rigidity and strength while maintaining the proper amount of flex to protect your drivetrain.

This is a high performance alternative to the oem flex disc. The oem rubber flex disc is known for failing under high loads and needing to be replaced on a regular basis. There is no longer a need to worry after you install a Revshift flex disc on your BMW.

- CNC machined 6061 aluminum body
- 95A durometer polyurethane bushings
- Replacement for OEM part # 26117546425 (LK=105mm/12mm)
- Rebuildable using one of our flex disc rebuild kits

Installation Instructions

Product Code: FLX-10512V

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post #17 of 183 Old 11-21-2013, 03:25 PM Thread Starter
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Yeah, I didn't see the url links originally nor the reference to the BMW OEM part number. I am going to buy one of the BMW OEM ones to check size and fit and will report back.

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2010 Hyundai Genesis Coupe 3.8L V6 Track M/T in Mirabeau Blue (Eva) - Retired
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2012 Hyundai Genesis Coupe 3.8L V6 Track M/T in Interlagos Yellow (Fei) - Active
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Total Miles in a Genesis Coupe - 206,000 miles

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post #18 of 183 Old 11-21-2013, 07:45 PM
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One of my clients had his one cracked too, and he took the measurements to get one, and well, this is their reply.

Quote:
Originally Posted by JewishThunder View Post
... "Big name" shops live off of kids like this. Enough money to buy super sweet marked up name brand parts at MSRP and then pay outrageous labor rates all day long to have a car that could have made the exact same power for significantly cheaper that will run ten times better... ... That's when people just pay out the ass 24/7 for the rest of their lives.
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post #19 of 183 Old 11-22-2013, 04:13 AM Thread Starter
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FYI to all, I will also take the opportunity to post this as a DIY too. Flex discs aren't hard to begin with, but it is always nice to have something to reference.

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Bought - 25 miles, Retired - 145,000 miles, Total Miles - 145,000 miles

2012 Hyundai Genesis Coupe 3.8L V6 Track M/T in Interlagos Yellow (Fei) - Active
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Total Miles in a Genesis Coupe - 206,000 miles

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post #20 of 183 Old 11-22-2013, 05:09 AM
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