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700r4 with no gears?

Discussion in 'The Garage' started by Russell, Apr 6, 2007.

  1. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Hey guys!

    What could cause a 700r4 to loose absolutely all mobility, putting it into drive, or reverse results in absolutely nothing, as if the truck was in neutral.

    I'm thinking the torque converter might be screwed up...

    What do you guys think?

    Russ
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    im guessing pump if its not making any noise. converter would make noise as would any other hard part in the tranny.
     
  3. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Wouldn't the engine really labour against the torque converter if the transmission's pump was locked up?
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Pull the inspection cover and make sure that the convertor bolts are still there and tight and also that you can't spin the convertor by hand. If the bolts are there and you can sping the convertor by hand then you have a busted flexplate.
     
  5. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Filter blocked/broken. Fluid level low? Linkage still attached?
     
  6. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    I have had a torque converter shear and leave no evidence anything was wrong. Power one minute...clunk.... no power at all, like it was just stuck in neutral. No other evidence other than the one clunk when it let go
     
  7. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Thats why I figured it might be the torque converter -- The lady said it made a heck of a clunk and thinking it was a busted crank or something more serious, she just killed the engine, then drug it home and listed it for sale...

    I'm about to go out and tear the running boards off so I can actually get underneith the thing, and do some diagnostiscs :)
     
  8. buefchris

    buefchris 1/2 ton status GMOTM Winner

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    Lotta miles? Front pump.:(
     
  9. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Nope, next to no miles, rebuilt less than 6000 miles ago infact...
     
  10. buefchris

    buefchris 1/2 ton status GMOTM Winner

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    It's to my understanding the front pump is one ofthe frist things to go. Mine slowly went 4th 3rd 2nd 1st in a matter of minutes. didn't even attempt reverse.:confused:
     
  11. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the pump is directly connected to the engine, so if it did lock up, the starter would have a hard time to turn over. that said, ive never seen a pump lock up so i won't spin. my experence with the pump is when it goes there is little to no noise and when it does, you have nothing at all.

    you said there was a big clunk, i have seen the input shaft seperate from the input hub assembly, but seems fairly rare.
     
  12. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Found the problem when I took the inspection plate off :)

    Three bolts with boogered up heads fell and hit me in the head as soon as I dropped the plate off, torque converter freewheels, lol

    I'm going to bolt it back up, and hopefully I'll have a perfectly good transmission :D
     
  13. DEMON44

    DEMON44 Low-Tech Redneck

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    nice looks like a good score
     
  14. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Don't you just love it when that happens!:D
     
  15. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Well, things never go that easy :P One of the bolts is busted off in the torque converter, and there is some nasty wear on the flywheel.

    I'm going to drop the tranny and replace both with a set I've got sitting in my parts pile, gonna take a couple hours, but whatever, then this truck is technically done...
     

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