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454+th350 strange rattle

Discussion in 'Automatic Transmission' started by northern, Nov 21, 2020.

  1. northern

    northern Junior Member

    Posts:
    11
    Likes Received:
    2
    Joined:
    Oct 23, 2019
    Location:
    Finland
    First Name:
    Tuomas
    Truck Year:
    1977
    Truck Model:
    Chevy Suburban c20
    Engine Size:
    350
    Here is video with manual shifting- noise is gone.

     
  2. trukman1

    trukman1 Full Access Member

    Posts:
    332
    Likes Received:
    127
    Joined:
    Apr 20, 2018
    Location:
    USA
    First Name:
    Gary
    Truck Year:
    1988
    Truck Model:
    K5 Blazer
    Engine Size:
    5.7 L (350)
    Odds are this isn't going to be it but my K5 rattled only in reverse. Thinking it was in the tranny I took it to shop. Rattled next time I drove it. My son got under it and discovered the tranny wasn't bolted firmly to the rear of the engine. Tightened loose bolts and no more rattle. Worth a look though. Good luck!
     
    DoubleDingo likes this.
  3. northern

    northern Junior Member

    Posts:
    11
    Likes Received:
    2
    Joined:
    Oct 23, 2019
    Location:
    Finland
    First Name:
    Tuomas
    Truck Year:
    1977
    Truck Model:
    Chevy Suburban c20
    Engine Size:
    350
    I think i found the culprit. Trans cooler lines (stock steel ones) were in direct contact with motor mount! I must had bent them when i removed the tranny when i tried another converter, easy fix, took me whole minute to bend them back. Thanks everyone for all sort of ideas!
     
  4. northern

    northern Junior Member

    Posts:
    11
    Likes Received:
    2
    Joined:
    Oct 23, 2019
    Location:
    Finland
    First Name:
    Tuomas
    Truck Year:
    1977
    Truck Model:
    Chevy Suburban c20
    Engine Size:
    350
    It wasn't the cooler lines. Whoah. It sure is a tricky one. Something loose somewhere maybe.
     

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