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700R4 questions

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

  1. Innerpiece

    Innerpiece 1/2 ton status

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    Hey all -- 87 silvarado blazer 305 TBI 700R4 np 205 32x12.5 3.10 Corp 10 bolt gov-lok

    (1) I'm getting some fairly hard shifts from 1st to 2nd (throw me back in the seat, raise the nose up). Most of the time it seems like the tranny's shifting late (high rpm in 1st) and I generally get a hard shift whether Im standing on the gas or not. Sometimes it will shift hard when cold and smooth out when warm ... other times it's vice versa. On a rare occasion i will get a hard shift from 2 to 1 when I decellerate gradually. Everything else is smooth as glass. Any thoughts?

    (2) Does my torque converter lockup in OD? I also have the large speed loss and engine bog before the downshift on slight inclines in OD. The tranny also wants to get into OD early depending on how far down the gas pedal is (45 going easy ... 55-60 pushing some) Any fixes (other than re-gearing)? my blazer came stock woth 31" and I don't think that 1" of tire diameter would make it shift that shitty on the highway.

    (3) I get a lot of "clunk" shifting into and out of gear ... I'm assuming with 150k and lots of links in the drivetrain it's just a little play. Anything to watch / worry about (I've checked U-joints)?

    (4) Any easy way to find out if the gov-lock is still working without pulling the diff cover?

    Thanks, and sorry for the variety.
     
  2. Chewy

    Chewy 1/2 ton status

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    The only thing I can think of right away may be obvious, check the tranny fluid. My 87 has about 165K on it and I notice the same clunk when shifting into gears.

    '87 Beast
    Colorado, USA
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    You can try putting the truck on grass/mud and either having your door open (mine always spun passenger side tire first) or have someone else watch, and slowly increase your rear tire RPM's...if they eventually lock (I hear around 1500RPM) then its working correctly.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    One comment regarding your overdrive question- You should always drive in D at city speeds. Once you get on the highway where you'll be holding continous speeds of 55+MPH, you can shift into OD. If you're always running in OD at city speeds you're cooking your tranny slowly but surely.


    <font color=red>PHOTO ALBUM-</font color=red> <A target="_blank" HREF=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</A>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  5. fad2blk99

    fad2blk99 1/2 ton status

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    Sounds like your TV cable is out of adjustment. I wouldn't recommend adjusting it yourself though. Setting your shift points to low can burn up your tranny in a matter of a couple miles. Call around to a tranny shop that specializes in OD's or particularly the 700r and have them check it out. It shouldn't cost you more than a half hour of labor, which is about $25. Good Luck! -Tommy
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    1. This is semi normal on a used transmission. Also someone could of added a corvette servo which makes most 700's shift very hard in the 1-2 area. The downshifting one is more of a concern and shows the wear on the transmission.
    2.Pretty typical w/ a Blazer... they aren't speed demons. Just make sure the tv cable is adjusted properly (It isn't hard at all).
    3.This clunkc can be a number of things... things such as a worn mtr and/or trans mount, to slack in the tcase or rearend. U-jt's are a common cause of this problem so check those first.


    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  7. ftn96

    ftn96 1/2 ton status

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    Mine has all these same symptoms. Thats pretty common stuff the amount of miles. Its just old. But definately have the TV cable checked adn change the fluid.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     

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