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.

tranny

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 88thunder, Aug 16, 2000.

  1. 88thunder

    88thunder Registered Member

    Joined:
    Aug 16, 2000
    Posts:
    9
    Likes Received:
    0
    i have an 88 k5 with a 350 tbi hooked up to the stock th700r tranny. sometimes when at low rpms or cruising speeds ( usually around 55 mph) the tranny seems to surge or jump from overdrive to drive. it almost seems like it cant decide which gear to be in. any help would be appreciated
    email- Crysler12@yahoo.com
     
  2. Blue85

    Blue85 Troll Premium Member

    Joined:
    Jul 26, 2000
    Posts:
    9,073
    Likes Received:
    486
    Location:
    Grand Rapids area
    The first step is to always make sure that the tranny is full to the proper level with clean fluid

    '85 JIMMY
    '90 paint/grill/trim 5"susp 33/12.5/16.5
    Fresh 350 B&M '87 TH700
     
  3. Kelboski

    Kelboski 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    306
    Likes Received:
    0
    Location:
    Mcdonough,Ga
    leave it in D at those speeds. save the OD for the highway....its better for the tranny that way.
    Kelboski
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,169
    Likes Received:
    1,372
    Location:
    E-town baby!
    Your tranny has a locking torque convertor. At moderate speeds with little throttle input it will 'lock-up', as soon as you accelerate a little it will unlock, this will give you the impression that it is going from drive to overdrive and back. You can confirm this by driving at a steady speed, and with your left foot lightly apply the brakes (just enough to turn the brake lights on) you should feel the convertor unlock. I had the 700R-4 in a S-10 Blazer[​IMG] and it used to do this all the time, I thought it was bloody annoying. HTH

    Rene <font color=red> 81 K-20 Jimmy </font color=red>
    <font color=green>[​IMG]"God hates a coward"</font color=green>[​IMG]
     
  5. BlazerBoy

    BlazerBoy 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    639
    Likes Received:
    0
    Location:
    Chicago IL.
    I dont know I am not a trans wizard but, I had a friends do the exact same thing we were on the highway and were driving and it was like we found the unattainable fine line where the trans couldnt decided which gear to stay in. Not to scare you but less than a 50 miles later we had to turn around and drive home in second because the 3rd gear syncros were shot(according to the trans guy we stopped at). I dont know I would go have someone look at it. Good luck.

    BlazerBoy
    http://generalblueballs.coloradok5.com
     

Share This Page