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My 2014 Tbird LT has less than 6000 miles but has developed a problem with clutch slipping under hard acceleration. The clutch lever had to be almost totally released before I was getting engagement so I adjusted the lever and cable so it operates more normally now but I'm still getting the slipping problem. I'm using Castrol 10W40 Actevo X-tra 4T Oil. Any suggestions on other adjustments I can make, different oil, or am I going to need a clutch disc replacement? Thanks!
 

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I do the same at the beginning of riding season....and during as well ….figure 8's etc. Have almost 14 k on original clutch.....use Rotella T5, T6 and at this moment have Castrol 4t full Syn as Auto Zone had it on clearance for $6/qt. The individual who provided the info on that link did a superb job. Stumped on your slippage issue.
 

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Have you measured your disks to see if they are still within tolerance? You may be able to save some money by just replacing the springs. My 2010 was slipping so I bought new disks and springs for a Storm. I assumed my disks were worn but when I compared the thickness of old and new they were the same. The Thunderbird and Storm springs have different part numbers but they have the same dimensions and they are stronger. You may be able to do some research and go with stronger aftermarket or OEM springs.
 

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Appreciate your suggestion, jaknife. How many miles did you have when you discovered the problem? No, I haven’t measured the clutch plates yet. Can you give me some more info about installing new springs? Where you bought them, price, how difficult to replace? Thanks.
 

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Appreciate your suggestion, jaknife. How many miles did you have when you discovered the problem? No, I haven’t measured the clutch plates yet. Can you give me some more info about installing new springs? Where you bought them, price, how difficult to replace? Thanks.
I feel strongly both ways about the service manual so I post about my experience and what works for me with my 2010 Thunderbird.
IMHO, in most cases the manual helps (lots of pictures) but I have found several places where it is wrong and some people on this forum also seem to disregard some of it. Belt tension and oil type are two examples. I have always used the recommended oil so I don't have an opinion on what works best.
I had about 60000 miles when I changed my clutch.
My 2010 manual says the disks should be 3.72-3.88. Service limit 3.5. My old disks and the new disks measured ~3.4. Definitely less than the 3.5 limit. The height and diameter of old and new springs were the same. The spring wire for the Storm was a larger diameter so my guess is they are stronger than the Thunderbird.
You will lose some oil when you remove the cover. You could change your springs without removing the disks so it's not difficult.
I used bikebandit to compare part numbers. I did this in 2015 so I don't remember prices.
 
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