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Big "CLUNK" when putting in gears and another problem
Like the title says, I'm hearing a big noise when I put the tranny in gears. It seems to make it louder when passing from Park to Reverse. At first I was thinking a bad motor mount but I changed the passenger side one (bottom) and looked at the others ones and they all seem fine.
Now I'm thinking this noise is coming from the tranny. Can it be the differential? (it reminds me the noise of a RWD with a bad driveshaft joint)
Another problem since this noise appears is that the tranny is acting really weird when cold. It seems to slip but the shift are still hard. Let's say I barely give throttle, in 1st , it seems to shift in 2nd, then downshift in first... When the car is hot everything seems fine.
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First 5th generation 3800 SC in Canada (that we know of)
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Update: the tranny slipping I was talking about seems more like an OD problem. It only happens when in OD, or maybe it's the torque locking and unlocking??
And still have that horrible "CLUNK !" when I change gears, but more when passing from PARK to REVERSE... (maybe the diff ?)
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First 5th generation 3800 SC in Canada (that we know of)
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Guillame,
I would look closely at the lower ENGINE mount. They can collapse internally and cause this symptom. Additionally, upper engine mounts can cause this as well.
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Quote:
Originally Posted by BIG JEFF
Guillame,
I would look closely at the lower ENGINE mount. They can collapse internally and cause this symptom. Additionally, upper engine mounts can cause this as well.
BIG JEFF
I put a brand new one lower engine mount (the one I had was new too but it has a 1 year warranty so I changed it too see) and I also inspected the upper one and I turned the bushig 1/4 turn in it to make them a little bit stiffer when engine rocks.
Nothing of the above help
It really looks like there is something loose in the tranny before it engage into gears.
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First 5th generation 3800 SC in Canada (that we know of)
Hmm, not sure but a similar loud thump when shifting into reverse or out sometimes. I think my TOGs might be hitting somewhere. I have not flipped my swaybar because it looks like it is not hitting it, but I think I will just to make sure.
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Howdy,
Well, I think the p0742 code certainly lends credibility to the trans problem theory. The most common cause for this is the converter, although solenoids or valve body can also cause this issue. The screwball "slipping" symptoms sound like a valve body issue. The valve body may also be causing the p0742. Unfortunately the p0742 code usually k.o.'s the converter and will stretch the drive chain in the process. I recommend a reputable trans professional in your area.
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