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D40 auto box shuddering
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Old 27-06-2017, 12:25 PM
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Default D40 auto box shuddering

06 2.5 d40 auto
I posted about 6 years ago, the shuddering at about 90 kph in lock up when under load. others have asked the same question, and while a lot of theories were put forward, i haven't heard of a proper solution.
I have lived with this issue for 170k, and now after driving from Brisbane to Canberra today towing a trailer, and having the car shake to bits on every slight incline, I have had enough. I am a curious if anyone who experiences this issue, has finally found a solution.
Only happens around 90kph+- in top gear and locked up. kicking down or backing off, stops the vibration, which resonates heavily through the car!
any clues?
cheers,eric
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Old 27-06-2017, 12:54 PM
Aaron31 Aaron31 is offline
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Probably unrelated (and unhelpful - sorry Eric) - if I hoof it off the line, mine will grumble at me (as in it makes a different, low rumble noise) which you can feel thru the truck and it *feels* like its slipping. Only does it from a standing start when in a hurry. Doesn't do it in 4LO. Beyond that it doesn't bother me.
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Old 27-06-2017, 01:21 PM
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no such issue with mine, smooth all the way, except for the 90kph area on lock up only. haven't noticed it in 4low
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Old 27-06-2017, 03:51 PM
waky53 waky53 is offline
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When you say in lock up, do you mean overdrive on or off?
Transmission specialist has told me to only tow with overdrive off.
Do you have any trouble codes or pending codes?
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Old 28-06-2017, 12:05 AM
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Quote:
Originally Posted by waky53 View Post
When you say in lock up, do you mean overdrive on or off?
Transmission specialist has told me to only tow with overdrive off.
Do you have any trouble codes or pending codes?
the problem started at around 60k, not long after i bought it. Now has 230k, has never thrown a code in it's life, touch wood. with no load, it's easy to dodge the issue, but just an empty 7x5 box trailer is enough to annoy the transmissin into shuddering on the slightest incline.
these transmissions are known to be touchy and kick down too early!
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Old 28-06-2017, 07:29 AM
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What sort of temps are you getting the ATF up to when towing underload? Id say its a programming issues with the TCM. It cannot decide whether to kick down a gear or hold it. My old EL falcon use to do the same thing when I was really pushing it
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Old 28-06-2017, 08:15 AM
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Quote:
Originally Posted by dilmah View Post
What sort of temps are you getting the ATF up to when towing underload? Id say its a programming issues with the TCM. It cannot decide whether to kick down a gear or hold it. My old EL falcon use to do the same thing when I was really pushing it

i can create the shuddering whenever i want to just by accelerating at the right speed, and that is with just me and the car. Just happens easier with a load!
it has been suggested it is the lockup solenoid, but the symptoms feel like tailshaft bent like a boomerang. doesn't happen below 80kph or above 100kph!
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Old 28-06-2017, 09:43 AM
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G'day Eric, these people are experts with D40 autos, they do alot of upgrades and fault finding.
http://aspleyautomatics.com.au/
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Old 28-06-2017, 11:37 AM
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Quote:
Originally Posted by happy john View Post
G'day Eric, these people are experts with D40 autos, they do alot of upgrades and fault finding.
http://aspleyautomatics.com.au/
thanks John, i'll call them tomorrow!
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Old 28-06-2017, 12:53 PM
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There's an easy way to tell where the vibration is coming from.

1) Drive in 1st gear and slowly accelerate until the tacho shows 2000rpm. If there's no vibration, it's not in the engine.

2) Drive in 4th gear (overdrive off). Accelerate to 100km/h gently. If there's no vibration at all, it's not in the drive train (back of the gearbox to the wheels).

3) Still at 100km/g, press the OD button to engage 5th gear. Any vibration? There may be a quick (mild) thump followed by a drop in revs as the TCC engages. At 100km/h you're above the "really should engage" point (it feels like around 95km/h in my car). Don't worry, there's another point around 125km/h where it doesn't give a shoot and engages the TCC anyway (or it does in mine).

4) Slow to 65km/h (my car engages the TCC at 69km/h) in 5th and re-accelerate to 100km/h. Vibration? If so, it's definitely the torque converter.

The clutch (TCC) had some issue that Nissan never explained and they replaced the TCs under warranty. Yours is well and truly out of warranty, but I wonder if they'd come to the party if you coughed labour?

If they won't at all and you want to keep the car, have a chat with Wholesale Automatics in Victoria. They build a TC that has a lower stall speed that bolts straight in and by all accounts is a superior product to the stock one.

The stock TC has a stall speed somewhere in the 2700-3100rpm range. This is the engine RPM at which the TC will grip tightly and transfer power more effectively into the gearbox. This means that accelerating at 2700rpm is more fuel efficient (because of the more effective power delivery) than accelerating at 2000rpm.

The Wholesale Automatics one has a stall speed of 2400rpm, so it's transferring power at a lower RPM and therefore wasting less RPM getting the power to the gearbox. It will result in fuel savings and lower rpm gear changes.
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