Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

A new member of 700R4 Problems club.

Discussion in 'The Garage' started by BadDog, Sep 2, 2004.

  1. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    My son came home today with the '88 saying it didn't want to shift right. Worked fine up till the drive home this afternoon.

    His description:

    Put in "Drive" and does nothing, might as well be Neutral. Manual shift to low and it goes. Sometimes shifts to second, sometimes not.

    Checked fluid, red but light caramel discoloration and at correct level (not low).

    Has runs large cooler and deep pan since before I got it.

    I don't know the 700R4 very well, but sounds to me like a pressure issue. On older stuff I would guess maybe modulator, but 700R4 uses a TV cable. I'll be checking the TV cable when it cools down "just to see", but this doesn't seem like anything I would think the TV cable would be involved in. Maybe governor, but don't think so. Any other ideas?

    Current Plan:

    Visual inspection of TV cable and checking adjustment. If that's ok, drop pan and check filter or for trash in the pan. If nothing obvious, check governor. New filter and change fluid and hope for the best.

    Suggestions?

    Proper adjustment of TV cable? I know I could find this by searching, but got to get back to work for now…
     
  2. zcarczar

    zcarczar 1/2 ton status

    Joined:
    Feb 10, 2002
    Posts:
    2,495
    Likes Received:
    0
    Location:
    Apple Valley California
    Ok, to correctly adjust the TV cable, take all of the adjustment out of the cable at the TB, the mash the pedal down to WFO, make sure you do this at the TB, or you may ot set the TV cable right. As you open the throttle you will hear the cable ratchet, this ok, and its what you want it to do so that it is properly adjusted.
     
  3. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    Thanks, I decided to do a quick search but gave up. Looks like search is still returning lots of unrelated hits. /forums/images/graemlins/frown.gif

    I'm hoping the cable just stretched or slipped, but not betting on it…
     
  4. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    [ QUOTE ]
    Put in "Drive" and does nothing, might as well be Neutral. Manual shift to low and it goes. Sometimes shifts to second, sometimes not.

    [/ QUOTE ]

    sounds like a valve body problem. /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    Sounds like either fluid is not flowing because it's plugged up, or the pump failed.
     
  6. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    how, if it moves when in manual low? /forums/images/graemlins/thinking.gif

    i can't think of anyother reason than the valve body may have a crack or something /forums/images/graemlins/thinking.gif thats weird
     
  7. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    Ok, finally got a chance to check it myself. He's dead on with the description. B&M Ratchet (god I hate it) put in "D" might as well be neutral. You can kinda feel/hear something going from N to D, but it's not in pulling. Thinking it might be governor, or needing more fluid, I reved 'er up a bit, nothing at all. Ratchet back one gear after another, no change till I hit "1" when it cluncked into gear as usual and drove as if nothing wrong… till I ratchet up to second and it acts like neutral. Reverse works just like first, nothing wrong.

    So, what I have is "R" and "1", but nothing in 2, 3, and OD.

    So, how are the clutch packs arrayed on this thing? Me thinks I have lost C2 apply (assuming I'm right about the way this thing works). Just went from 100% "working fine" (according to the boy) to 0% after driving to school this morning. Drove it in and parked it, then when he cranked it this evening nothing. If it were acting up, getting progressively worse, or something… but just gone? Do they normally just go like that? Any likely culprits other than the already suspected "something plugged" or cracked valve body, or whatever. The fact that it worked, and then didn't after parked and cooled off makes me thing something settled in a passage or something stuck open. Any tranny gurus feel like giving me a clue?
     
  8. kazajames56

    kazajames56 Registered Member

    Joined:
    Jun 13, 2003
    Posts:
    28
    Likes Received:
    0
    Location:
    Kenner, LA
    Had the same thing happen to one of mine.... something had to break in it because it cracked the case and broke a chunk off... sorry I don't have any help as to fixing it. All of the symptoms were the same for me though: Drive didn't work, reverse and first worked fine, and I could manually shift it into second once I got going every now and then.
     
  9. hi pinion

    hi pinion 3/4 ton status

    Joined:
    Sep 25, 2003
    Posts:
    5,354
    Likes Received:
    0
    Location:
    **PLUMBING THE WORLD**
  10. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    you can check the governer, but usually it only 1st still works in OD, D 2 and 1 just no upshift.

    there are usually some symtoms, like takes longer than normal to enguage, slipping, stuff like that. usually doesn't just up and go out.

    im preaty sure somthing broke, valve in the valve body, the valve body itself, case. you gonna have to pull the pan and check it out.

    there is 1 clutch pack and the band for second. but it still should move in any of the forward gear selection.

    one thing you can do, just about every 700r4 automaticly shifts from first to second even when in manual low at about 45 mph, i would do it in 4lo so i don't have to go so far to check it.
     
  11. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    Yeah, the pan is dropping tomorrow, no time today and I gotta pick up the filter and gasket kit. And I already tried the high rpm forced shift with no luck, it stayed in low. I'll know more tomorrow evening when the pan comes down.

    Thanks for the info guys.
     
  12. FWP

    FWP CRS

    Joined:
    Oct 11, 2000
    Posts:
    3,845
    Likes Received:
    3
    Location:
    Prescott Valley, AZ
    screw it, just put in a 350 and forget about it. /forums/images/graemlins/eek.gif
     
  13. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    With 4.56 gears and 35" ATs plus loosing the low... Nah...
     
  14. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

    Joined:
    Dec 15, 2002
    Posts:
    15,140
    Likes Received:
    565
    Location:
    Iowa
    Mine did something similar. It wouldn't shift out of low at all. What happened was the band inside has a little socket on it and a push rod of sorts engages that socket to tighten the band for shifts. The back side of the socket had snapped out so instead of engaging and tightening the band it would just slip past. Sorry to say its a full tear down to fix this problem. Hope that's not what it is.
     
  15. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    Well, she's done...

    Anyone recognize these pieces?

    [​IMG]
     
  16. big jimmy 91

    big jimmy 91 1/2 ton status

    Joined:
    Feb 21, 2004
    Posts:
    639
    Likes Received:
    0
    Location:
    Northwestern Ontario Canada
    Nasty /forums/images/graemlins/yikes.gif
    Are you going to replace it with a built up unit?
     
  17. Jonny-K5

    Jonny-K5 1/2 ton status

    Joined:
    May 27, 2003
    Posts:
    1,654
    Likes Received:
    0
    Location:
    SoCal
    was that the original trans? how many miles?

    i wouldnt even bother trying to rebuild that unit. get a freshly rebuilt one from bowtie or Pheonix. bowtie has got great customer service and prices, plus no core charge.
     
  18. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    that sucks dude, time for something beefier

    what kinda motor is in that thing anyway?
     
  19. mosesburb

    mosesburb For Rent Premium Member GMOTM Winner

    Joined:
    Apr 20, 2003
    Posts:
    2,175
    Likes Received:
    132
    Location:
    Phoenix AZ
    Wow /forums/images/graemlins/yikes.gif, those pieces look important!!

    Looks like the boy done good /forums/images/graemlins/thumb.gif.

    I know, my day is coming.

     
  20. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    That slotted piece on the right looks like the end of some sort of "band" where the slot would slide over some sort of tab. The rest is indeterminate, but that piece has a familiar look to it for some reason. Been many MANY years since I went in an auto at all, much less a 700r4.

    Botor is a mild TBI 350 with cam and Dart heads along with a few other goodies. Nothing major, but it pulls well...

    No idea if it was the original trans, but it was "built" before I got it. Shift kit at a minimum, not sure what else.
     

Share This Page