Stronger driveshaft replacement? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Grady · 03-10-2024, 10:41 AM

Quote:

Originally Posted by blsfrs

Several months ago (in a galaxy far, far away) Didn't someone post about a CF driveshaft failure on their rally car.

Yep, probably took a rock hit. CF is strong, until it get damaged then it is shit. I have the center tunnel covered to protect it from getting hit.

Ultramaroon · 03-10-2024, 03:07 PM

Just ask Stockton Rush.

norcalpb · 03-11-2024, 12:17 PM

I would say get the gr86 driveshaft but I’m not 100% sure they fit the first gen.

gpvecchi · 03-11-2024, 05:52 PM

It fits and it's 1,5 kgs lighter. I would like to know is the diameter is the same, and how they achieved more lightness.

norcalpb · 03-12-2024, 11:55 AM

Quote:

Originally Posted by gpvecchi

It fits and it's 1,5 kgs lighter. I would like to know is the diameter is the same, and how they achieved more lightness.

I’m down to order one and measure it for you, but do you remember if the automatic and manual driveshafts are the same?

dragoontwo · 03-12-2024, 12:01 PM

Quote:

Originally Posted by norcalpb

I’m down to order one and measure it for you, but do you remember if the automatic and manual driveshafts are the same?

Or you could check some documents that somebody has.

norcalpb · 03-12-2024, 12:03 PM

Quote:

Originally Posted by dragoontwo

Or you could check some documents that somebody has.

I know I was going to do my usual parts.subaru.com research but wanted to see if someone knew top of mind first lol.

Edit: it appears auto and 6mt have different part numbers, makes my eBay shopping slightly more complicated

dragoontwo · 03-12-2024, 01:42 PM

Quote:

Originally Posted by norcalpb

I know I was going to do my usual parts.subaru.com research but wanted to see if someone knew top of mind first lol.

Edit: it appears auto and 6mt have different part numbers, makes my eBay shopping slightly more complicated

I meant the stuff in my signature. Specificlly for the shaft diameters.

gpvecchi · 03-12-2024, 04:38 PM

Thank you for your help. I confirm that both the propeller shafts have the same diameter, 70 in the first part and 57 in the second part.
Now we'd need to understand why the second gen is lighter, less material (so more flexible) or just different material?

norcalpb · 03-12-2024, 05:43 PM

I’ll take some comparison photos later this month when my GR86 driveshaft arrives!

norcalpb · 04-07-2024, 10:48 PM

Quote:

Originally Posted by gpvecchi

Thank you for your help. I confirm that both the propeller shafts have the same diameter, 70 in the first part and 57 in the second part.
Now we'd need to understand why the second gen is lighter, less material (so more flexible) or just different material?

They are pretty identical but this section was different. Looks like they replaced the main U joint with a CV joint?

gpvecchi · 04-08-2024, 12:59 AM

Thank you very much. Are you able to weight them?

norcalpb · 04-08-2024, 04:07 PM

Quote:

Originally Posted by gpvecchi

Thank you very much. Are you able to weight them?

Didn’t have anything to weight them with by unfortunately the gr86 is already on the car.

gpvecchi · 04-09-2024, 12:53 AM

Any difference in driving?

03-10-2024, 03:07 PM	#16
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,870 Thanks: 52,132 Thanked 36,520 Times in 18,921 Posts Mentioned: 1107 Post(s) Tagged: 9 Thread(s)	Just ask Stockton Rush. __________________ service manuals

03-12-2024, 04:38 PM	#23
gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,018 Thanks: 406 Thanked 335 Times in 187 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	Thank you for your help. I confirm that both the propeller shafts have the same diameter, 70 in the first part and 57 in the second part. Now we'd need to understand why the second gen is lighter, less material (so more flexible) or just different material? Last edited by gpvecchi; 03-12-2024 at 04:59 PM.

03-12-2024, 05:43 PM	#24
norcalpb Senior Member Join Date: Oct 2013 Drives: 2013 BRZ, 2023 Model 3 Location: SF Bay Area Posts: 2,296 Thanks: 1,212 Thanked 863 Times in 570 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	I’ll take some comparison photos later this month when my GR86 driveshaft arrives! Last edited by norcalpb; 04-07-2024 at 10:44 PM.

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gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,018 Thanks: 406 Thanked 335 Times in 187 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	It fits and it's 1,5 kgs lighter. I would like to know is the diameter is the same, and how they achieved more lightness.

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gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,018 Thanks: 406 Thanked 335 Times in 187 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	Thank you very much. Are you able to weight them?

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