Clunk From Park to Neutral
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Joined: Jul 2022
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Clunk From Park to Neutral
Hey Everyone,
Edit: Wrong title, sorry. Clunk from P to R, not N.
I am trying to understand some items regarding the drivetrain. I have a hard clunk from P to R on my 87 auto vette. Shifting to D or N is all fine, even D to R, it is only P to R that is bad. U joints have been inspected and I have replaced all the ones in the half shafts. Both myself and a reputable mechanic have determined the Ujoints on the driveshaft are fine, but I feel the clunking coming from the rear differential area.
I know these vehicles are torquey and a degree of "clunk" could be normal, but is there anything specifically that could make a shift from P to R that rough?
Thanks
Edit: Wrong title, sorry. Clunk from P to R, not N.
I am trying to understand some items regarding the drivetrain. I have a hard clunk from P to R on my 87 auto vette. Shifting to D or N is all fine, even D to R, it is only P to R that is bad. U joints have been inspected and I have replaced all the ones in the half shafts. Both myself and a reputable mechanic have determined the Ujoints on the driveshaft are fine, but I feel the clunking coming from the rear differential area.
I know these vehicles are torquey and a degree of "clunk" could be normal, but is there anything specifically that could make a shift from P to R that rough?
Thanks
Last edited by Speedy Saguaro; Aug 12, 2022 at 06:32 PM. Reason: Wrong Title
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
My initial reaction was the u Joints. Since you have changed the half shafts did you also change the drive shaft? Also, check with the fluid in the differential. New fluid will most certainly quiet down the clunks.
Thread Starter
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Joined: Jul 2022
Posts: 58
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the diff had been serviced by a shop a few hundred miles ago, was done under the previous owner. Not positive what they did, but it sounds like the diff fluid was replaced. Could wrong level of diff fluid be causing this?
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
Is it possible to provide a sound video? As you can imaging, diagnosing sounds by description is tough. One man's "Clunk" is another mans "Tick"
