Odd transmission noise
#1
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My XK8 is the 2005 4.2s version and I have noticed that when accelerating hard from standstill (or nearly so) there is a strange very short noise from the rear which I can only describe as an "oink". Perhaps it's something to do with the electronics controlling excess power to the rear wheels. Is that possible? Has anyone experienced similar noises and if so, any idea what it is?
Ray
Ray
#2
![Default](/forum/images/icons/icon1.gif)
My XK8 is the 2005 4.2s version and I have noticed that when accelerating hard from standstill (or nearly so) there is a strange very short noise from the rear which I can only describe as an "oink". Perhaps it's something to do with the electronics controlling excess power to the rear wheels. Is that possible? Has anyone experienced similar noises and if so, any idea what it is?
Ray
Ray
#3
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You're hearing the classic 6-speed ZF "bark". After the transmission fluid gets a little age on it, the clutch packs tend to grab for just a split second on certain upshifts. When they do, you hear the "bark". I have spoken with ZF tech support several times about it. They claim it is simply an annoyance with no damage being done to any of the ZF's internal components. The remedy is essentially fresh transmission fluid (a drain-and-fill). Depending upon your mileage, you may want to wait awhile. ZF claims that under normal driving conditions (a 50/50 mix of highway/city driving, no towing, no dirt or gravel roads, and no hot-rodding), the Lifeguard 6 transmission fluid is good for 100,000 miles. But most of us long-time forum members will change it prior to that....
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#8
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I have a 2000 XK8, it is breaking a bit faster than I can fix it. Today's episode is :
When hard accellerating, eg freeway on-ramp, when shifting into 4th or 5th, I have been hearing a loud clunk in the rear end, just once on the upshift. My car has 67,000 miles on it. I just bought it, no service records and I'm thinking about changing the J shifter tranny fluid right now. Does this sound particularly odd or is it consistent with these cars? I'll search the forum FAQ for recommended best fluid and how to perform the fluid change myself... Someone said IIRC gearbox oil, sounded expensive....
When hard accellerating, eg freeway on-ramp, when shifting into 4th or 5th, I have been hearing a loud clunk in the rear end, just once on the upshift. My car has 67,000 miles on it. I just bought it, no service records and I'm thinking about changing the J shifter tranny fluid right now. Does this sound particularly odd or is it consistent with these cars? I'll search the forum FAQ for recommended best fluid and how to perform the fluid change myself... Someone said IIRC gearbox oil, sounded expensive....
#9
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shootingbrake
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09-23-2015 10:54 AM
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