Noise and slight jerk when downshifting from 2nd to 1st
47k miles 2010 XK,
when downshifting from 2nd to first especially when going down hill, and especially when the car is hot and been driven aggressively, I can hear and feel a clunk almost like somethings loose suspension or a loose transmission mount, any advice on what to look at first? |
Universal joints. <--- easiest
Transmission mounts. Engine mounts. Rear suspension bushes. |
Drive train comes to mind 1st....see how much lash is present with it jacked then rotate a wheel.
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How much lash is acceptable?
Should this be checked while in P? When i push my car I can roll it a couple inches while in Park back and fourth |
While in park and one rear wheel off the ground, slowly turn it back/forth look for diff motion but no drive shaft motion. You might also hear unusual clunk/grind sounds from the U-joints if they are at fault.
As CeeJay suggests it could also be mounts or bushings as well. |
I live in and work in mountaneous terrain, and I have never had to downshift into 1st. Just curious about why youre shifting down that low while at speed? |
Sometimes in my condo garage the trans automatically goes to 1st in sport mode.
also the lovely pops and cracks when coming to a stop light |
For example coming down my garage which is quite steep while im braking the trans goes into 1st and i feel and hear a clunk.
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ZF transmission lurch???
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ZF lurch? Please explain
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Here ya go... Jaguar S-Type ZF Gearbox Lurch fault
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Funny as I don't ever recall my car being in 1st gear.
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As you come to a stop in first gear going going downhill in sport mode, i assure you, your car does downshift to 1st. But you probably dont notice.
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Originally Posted by tarokyama
(Post 2010167)
As you come to a stop in first gear going going downhill in sport mode, i assure you, your car does downshift to 1st. But you probably dont notice.
|
Originally Posted by tarokyama
(Post 2009904)
For example coming down my garage which is quite steep while im braking the trans goes into 1st and i feel and hear a clunk.
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Originally Posted by tarokyama
(Post 2010167)
As you come to a stop in first gear going going downhill in sport mode, i assure you, your car does downshift to 1st. But you probably dont notice.
|
Transmission fluid has a life, and how it is used decreases that life.
Its hard to know for sure based on what you say. The fact that it is "when hot and driven hard" inclines me to believe it is fluid related. Wear in driveshaft's would be evident when cold. |
☝🏻Yup |
It seems to be a misconception that the car defaults to starting in 2nd gear. I can assure you, at least on my 2007 model, whether in D or S mode, it always starts from 1st at a stop. All you have to do is count the shifts to 6 to realize it!
To the OP, when you say clunk do you mean like a clicking/popping sound? I have had this noise ever since I bought my XKR, most evident when lurching slightly when paddle shifting and/or getting on and off the gas in manual mode while at mid to upper RPMs. Nobody seems to have figured it out. |
Originally Posted by amcdonal86
(Post 2011268)
It seems to be a misconception that the car defaults to starting in 2nd gear. I can assure you, at least on my 2007 model, whether in D or S mode, it always starts from 1st at a stop. All you have to do is count the shifts to 6 to realize it!
On my 5.0 XKR, always going to 1st would be unpleasant and unnecessary. I have found it depends on how much throttle I apply. In other words I have to request the 1st gear. |
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