Torqueflite 727 "clunk"

Transmission and Drivetrain

  1. woodwiz

    woodwiz Well-Known Member

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    Coming out of park to reverse and or passing back thru to drive and i get that damn "Clunk".
    Should i be overly worried or does she need adjusting??
     
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  2. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    Might be the driveshaft, there is a little play in the rear end and you might be hearing it from there. Is the idle on the high side? That can make it sound worse. Could be normal, or wear in the rear end or U-joints or the transmission which I doubt.
     
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  3. Plybeep68

    Plybeep68 Acceleratii Incredibus

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    I agree with Hemibeep, check the driveshaft 1st
     
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  4. woodwiz

    woodwiz Well-Known Member

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    I shall....Thanks!!
     
  5. woodwiz

    woodwiz Well-Known Member

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    I checked out the driveshaft and it is solid.Looks like it has new u-joints at both ends,perhaps like you said it may be coming from the rear end...the search continues!
     
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  6. Russ69Runner

    Russ69Runner Well-Known Member

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    What rear end do you have. Is it a posi or limited slip.
     
  7. woodwiz

    woodwiz Well-Known Member

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    Can I find that out by numbers on the fender tag or markings on the differential ? My guess is limited slip.
     
  8. Russ69Runner

    Russ69Runner Well-Known Member

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    th (2).jpg th (3).jpg You will find marking's on the chunk like this. X for 741- 2 on the 742 Then their is the 489 Three types. I rebuilt my 741 new ring gear and pinion. But still some slack in it. The spider gears are worn also. But going to run it till I can put the other chunk in it I got. Even the spider gears can give you a clunk sound. Going forward then backing up could give you a sound.
     
  9. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    It might be nothing but it doesn't hurt to look it over. We had an old Plymouth growing up that the drive shaft would almost ring putting it into reverse. Never any trouble with it.
     
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  10. woodwiz

    woodwiz Well-Known Member

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    Took it for a spin to get fuel and it did it at different levels of noise. Could some energy be coming from the torque converter ? But it does sound like it's coming from the rear end.
     
  11. Russ69Runner

    Russ69Runner Well-Known Member

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    If you can get some one to sit in the back seat when your driving they should be able to here it better than the driver. ?
     
  12. woodwiz

    woodwiz Well-Known Member

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    Here’s a pic of the rear end w/numbers.

    58B1DB07-0155-4DB0-BD80-8CF9B677D00A.jpeg

    0C95ED81-B306-46C7-9E84-DAAA3B678366.jpeg
     

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