TT coupler options
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Melting Slicks
Joined: Jan 2014
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From: Central Florida
TT coupler options
Well I'm sure it's my fault for how I drive my car 
but I'm in need of new TT couplers again. I have poly couplers from driveshaft shop that I got with my RPM transmission. While my car was being worked on for a few repairs my mechanic noticed a lot of vibrations in TT he thought was bearings. I stoped by today and it was apart and one of his mechanics showed me the coupler was loose where the sleeves are pressed into coupler. It was still all connected so I could not see the sleeves but bolts were tight and it had a lot of play in it. So is there a better option than these poly couplers? I obviously need to be a little easier from a dig
Any suggestions would be appreciated.
I'm around 550hp and Tq
but I'm in need of new TT couplers again. I have poly couplers from driveshaft shop that I got with my RPM transmission. While my car was being worked on for a few repairs my mechanic noticed a lot of vibrations in TT he thought was bearings. I stoped by today and it was apart and one of his mechanics showed me the coupler was loose where the sleeves are pressed into coupler. It was still all connected so I could not see the sleeves but bolts were tight and it had a lot of play in it. So is there a better option than these poly couplers? I obviously need to be a little easier from a digAny suggestions would be appreciated.
I'm around 550hp and Tq
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hmm, I have the same ones and recall a couple of those sleeves in mine being loose when I installed my driveshaft which was the first time the couplers were removed since first being installed... I didn't think anything of it and put them back together on the new driveshaft and it has been fine so far... the polyurethane they use is so rigid I didn't think it would ever pose a problem and I didn't want to go with aluminum couplers because I thought that might be too harsh but if the dss will fail then aluminum seems to be the only other option I can think of as far as couplers go or get a 3.5" driveshaft that eliminates the couplers altogether... I'm interested to see what you go with as a solution and if you can get any pics of the worn couplers that would be cool
Last edited by StingrayRebel; Sep 27, 2017 at 10:20 PM.
Thread Starter
Melting Slicks
Joined: Jan 2014
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From: Central Florida
I have not seen them apart yet, I was in a hurry when I went byhis shop. Maybe that's not what was making the noise ? I will be interested to see them apart as well to see if the holes are actually stretched. I'll keep you informed and take pictures when he gets them apart
Racer
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From: Aiken SC
I run the carbon fiber driveshaft from the driveshaft shop. Its likely overkill for your setup but it eliminates the couplers. Some say they can feel more NVH (noise vibration harshness) but I cant tell a difference.
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I was at the RPM shop last year picking up a friends car and was talking with the guys about couplers for my car (has solid right now and they cause ridiculous vibrations). Their recommendation was to put ZR1 Couplers in the car and call it a day. You need to machine down the driveshaft ends for the couplers since the ZR1 couplers are slightly wider, but according to RPM they're being used reliably and with longevity in high (read 1k plus hp) cars.
Thread Starter
Melting Slicks
Joined: Jan 2014
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From: Central Florida
Well it sounds like machining down shaft and ZR1 couplers are the way to go.
1) Is that as simple as measuring the difference between the two machining down the shaft that much?
2)What do ZR1 couplers cost and what are they made of?
Did anyone else have this issue of the Poly couplers getting loose from the steel sleeves causing noise and failure? I'm not sure what would have happened if I kept running them
These things were not cheap at $200.00 each.
Any feed back appreciated....including if I just need to take it easier on whatever I go with I drive the car pretty aggressive but it is on regular size summer tires not DRs.
1) Is that as simple as measuring the difference between the two machining down the shaft that much?
2)What do ZR1 couplers cost and what are they made of?
Did anyone else have this issue of the Poly couplers getting loose from the steel sleeves causing noise and failure? I'm not sure what would have happened if I kept running them
These things were not cheap at $200.00 each.Any feed back appreciated....including if I just need to take it easier on whatever I go with
I drive the car pretty aggressive but it is on regular size summer tires not DRs.
Last edited by Forcedvert; Oct 2, 2017 at 08:09 PM.
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Thread Starter
Melting Slicks
Joined: Jan 2014
Posts: 2,764
Likes: 375
From: Central Florida
hmm, I have the same ones and recall a couple of those sleeves in mine being loose when I installed my driveshaft which was the first time the couplers were removed since first being installed... I didn't think anything of it and put them back together on the new driveshaft and it has been fine so far... the polyurethane they use is so rigid I didn't think it would ever pose a problem and I didn't want to go with aluminum couplers because I thought that might be too harsh but if the dss will fail then aluminum seems to be the only other option I can think of as far as couplers go or get a 3.5" driveshaft that eliminates the couplers altogether... I'm interested to see what you go with as a solution and if you can get any pics of the worn couplers that would be cool
Last edited by Forcedvert; Oct 4, 2017 at 06:55 PM.
Thread Starter
Melting Slicks
Joined: Jan 2014
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From: Central Florida
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I was going to ask what all the rust colored stuff was, that's very strange... do you have any idea where it came from??... mine didn't look that way when I installed my driveshaft, they looked just as they did when I originally installed them... if you take the sleeves out do the holes look out of round?
Last edited by StingrayRebel; Oct 4, 2017 at 07:37 PM.
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Originally Posted by Forcedvert
Can I use the stock shaft with ZR1 couplers as I'm at 550hp not 1000hp seems like the shaft is more than I need?
Thread Starter
Melting Slicks
Joined: Jan 2014
Posts: 2,764
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From: Central Florida
I was going to ask what all the rust colored stuff was, that's very strange... do you jave any idea where it came from??... mine didn't look that way when I installed my driveshaft, they looked just as they did when I originally installed them... if you take the sleeves out do the holes look out of round?
I'm told the dust is metal. The only thing I can think of is from metal from sleeves spinning/ vibrating and once loose easily turning to rust.......very humid hear
The bolts were very tight, only play was sleeves inside couplers when you wiggle splines?
I wonder if they can be too tight? And mash the two pieces (sleeves) together and almost act like a solid coupler and maybe too much vibration? They were so tight one of the sleeves was stuck to the bolt washer and had to be pried apart. I hope someone has seen this.