Hi guys, I hope someone might be able to give me some guidance, my 2009 XC60 has a shudder on light to medium acceleration, it can be quiet violent and shake the whole car and is worse going uphill.
The shudder mainly appears when in 3rd gear between 20 & 50 kph but sometimes starts just before it changes from 2nd gear.
I initially diagnosed it as front CV shafts as I was aware they were becoming worn so I ordered a set of new "Original Performance" shafts from Nashville in the US which I have installed, the shudder has improved slightly but is still there.
If I accelerate harder it reduces the shudder, if I reduce acceleration it becomes less obvious.
Is there a common problem with these when using aftermarket shafts? It still seems to me to be a CV joint frequency, it doesn't feel like a rear tail shaft uni joint type vibration as this is generally a higher frequency, the only other things I can think of might be engine/transmission mounts, I've checked the engine movement when parked and it seems quiet normal & not excessive. I'm a motor mechanic but have been out of the game for many years so may have lost most of my diagnosis skills.
I have read on another forum about the XC70 being very fussy with CV shafts if they were non genuine, could this be the case with the XC60's as well?
Thank you for any guidance and all input is appreciated.

 

Hello..... Anyone???

 

My wife had a similar issue with her XC-60. After connecting my Autel analyzer and watching the live transmission data while she drove the vehicle, I found the problem:

The torque converter clutch shudders when going between unlocked and locked mode. I tried flushing the transmission fluid, which it needed because the fluid was pretty muddy-looking. After replacing the fluid until nice and red, the shudder continued. Ultimately what fixed it was adding a transmission friction modifier from a company called Lube Guard. The additive is available from Amazon: "Dr. Tranny's Shudder Stop". (No, I'm not joking). No more shudder, and the transmission shifts perfectly.

I'm not a big fan of additives, but Lube Guard has a great track record of friction modifiers and seemed to work very well in this application.

 

Is the transmission still working ok??? Thanks, Laird

 

Is the tranny still working ok? Thanks, Laird

 

if there is nothing in suspension it woild be a shudder from engine itself as a misfire error

 

Thanks for your thoughts. Could you explain a little more in detail so I might be able to grasp your suggestion? Thanks

 

Friction modifier? That makes sense. Long term build of residue and wear on the friction plates seems logical and short of tearing the entire transmission down, this seems like a very good way to fix the issue.

Thanks KellyfromVA. I just learned something good today!