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  1. #1

    Default 1978 Chevy C10 - Unable to shift

    Recently bought a 1978 Chevy C10 4x4 “Heavy 1/2 ton” 350 V8 Turbo 400
    “Less that 2,000 miles on crate motor and trans re-build” according to the sign in the window. Paid $3100 cash. It is in very good aesthetic condition and has an 8,000lb Ramsey winch on it. This truck is my hunting/camping/firewood truck, which is pretty much what it has always been used for, based on what the previous owner said and guessing from numerous small modifications it has (additional tie-down points, hitch, etc).

    This truck NOT my daily driver, but recently my friend was driving it around town while his car was in the shop. Then I got the dreaded phone call, “Dude, your truck is broken.” Apparently, my friend parked my truck outside his house one night and the next morning it started up fine, but the shifter doesn’t do anything.

    Because I’m not in dire need of this truck working, I found a mobile mechanic via Craigslist and he came took a look at it. This mechanic is a younger guy and doesn’t seem to be an expert in older trucks, but he was suspect about the rebuilt engine/tranny. Regardless, here are the symptoms:

    - there was no obvious transmission blow out. It ran fine one day and just wouldnt shift the next morning. There is no clanking or any other unusual sounds
    - fluid levels were/are normal
    - The “three on the tree” shifter still moves and feels like its shifting, but produces no results.
    - the rod going into the transmission moves when the shifter is moved.
    - The truck is currently in “Neutral”
    - the brake DOES NOT need to be depressed in order for one to move the shifter, **that is a new development**
    - the mechanic pointed out that no transmission fluid comes out of the hose that is connected to the radiator when that is disconnected while the engine is running (and warmed up)


    Possible problem(s), according to my mechanic, friends, and coworkers:
    1) transmission filter is clogged
    2) transmission pump is dead
    3) the transmission is dead
    4) the transmission isn't vacuumed

    Solutions:
    1) take off the pan and see what’s going on/replace the filter
    2) Rather than dump $1500+ into this truck that is basically my glorified ATV, buy a ‘new’ transmission (or even a wrecker to cannibalize) and just swap ‘em. I believe a variety of Chevy/GMC trannys will fit my truck

    What do you all recommend?

  2. #2

    Default

    Replace the friend bearing........

    Quote Originally Posted by amcco220 View Post
    Recently bought a 1978 Chevy C10 4x4 “Heavy 1/2 ton” 350 V8 Turbo 400
    “Less that 2,000 miles on crate motor and trans re-build” according to the sign in the window. Paid $3100 cash. It is in very good aesthetic condition and has an 8,000lb Ramsey winch on it. This truck is my hunting/camping/firewood truck, which is pretty much what it has always been used for, based on what the previous owner said and guessing from numerous small modifications it has (additional tie-down points, hitch, etc).

    This truck NOT my daily driver, but recently my friend was driving it around town while his car was in the shop. Then I got the dreaded phone call, “Dude, your truck is broken.” Apparently, my friend parked my truck outside his house one night and the next morning it started up fine, but the shifter doesn’t do anything.

    Because I’m not in dire need of this truck working, I found a mobile mechanic via Craigslist and he came took a look at it. This mechanic is a younger guy and doesn’t seem to be an expert in older trucks, but he was suspect about the rebuilt engine/tranny. Regardless, here are the symptoms:

    - there was no obvious transmission blow out. It ran fine one day and just wouldnt shift the next morning. There is no clanking or any other unusual sounds
    - fluid levels were/are normal
    - The “three on the tree” shifter still moves and feels like its shifting, but produces no results.
    - the rod going into the transmission moves when the shifter is moved.
    - The truck is currently in “Neutral”
    - the brake DOES NOT need to be depressed in order for one to move the shifter, **that is a new development**
    - the mechanic pointed out that no transmission fluid comes out of the hose that is connected to the radiator when that is disconnected while the engine is running (and warmed up)


    Possible problem(s), according to my mechanic, friends, and coworkers:
    1) transmission filter is clogged
    2) transmission pump is dead
    3) the transmission is dead
    4) the transmission isn't vacuumed

    Solutions:
    1) take off the pan and see what’s going on/replace the filter
    2) Rather than dump $1500+ into this truck that is basically my glorified ATV, buy a ‘new’ transmission (or even a wrecker to cannibalize) and just swap ‘em. I believe a variety of Chevy/GMC trannys will fit my truck

    What do you all recommend?

  3. #3

    Default

    Quote Originally Posted by GMANs95 View Post
    Replace the friend bearing........
    What is that?

  4. #4
    Master Mechanic BurbanMan's Avatar
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    Jul 2013
    Location
    Dolores, CO
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    790

    Default

    Turbo 350,400, and 700 r4 all interchange. Lengths may vary 700r4 would have to have the lockup wired up
    Chuckie!!!


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