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350 transmision

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wacopilot, May 12, 2001.

  1. wacopilot

    wacopilot Newbie

    Apr 1, 2001
    Likes Received:
    los angeles , ca
    Hello friends,

    my 77 blazer with a 350/350 and a 203, is making weird noises at idle. It almost sounds alomost like a rod knock but it is not that, definitely is from tne transmision. does a 4x4 use a diffrent type of trans. because of the transfer case, or will any 350 bolt right up?
  2. Twiz

    Twiz 1/2 ton status

    Mar 8, 2001
    Likes Received:
    Clearfield Ut.
    Sounds like a flex plate thing to me! (in between engine and trans, also referd to as as the "starter ring" n/g) A "tic-tic-tic" at idle? Also could be a valve lifer, but they can be heard easly from the engine, not from a trans.

    To check, pull the trans inspection cover behind the oil pan (4 bolts) and inspect the flex plate. use a screw drive or pry bar and SLIGHTLY wedge the flex plate back, check for cracks by the center (crank shaft). Also check for obstructions, bent inspection covers, or starter interfirence. Also to further diag,; start and let idle ("tic" present?), shift into drive/reverse, (did the" tic" go away?) If it went away with engine load in drive (flex plate stressed) it COULD be a cracked or bent flex plate, or a engine trans miss alighnment.

    "does a 4x4 use a diffrent type of trans?"-
    Yes and no. same trans, diffrent out-put shafts to the drive line (2wd) or t-case(4wd).


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