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 servo?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Wallyb, Feb 18, 2001.

  1. Wallyb

    Wallyb Registered Member

    Joined:
    Jan 15, 2001
    Posts:
    24
    Likes Received:
    0
    Location:
    Southwest Minnesota
    Just wondering if anyone has changed their stock servo to a vette servo?? if so, how hard is it, and is it worth it?

    Thanks!
     
  2. Blue85

    Blue85 Troll Premium Member

    Joined:
    Jul 26, 2000
    Posts:
    9,086
    Likes Received:
    487
    Location:
    Grand Rapids area
    The Vette servo grabs the 2-4 band harder in 2nd gear, but also releases slower. If you put the Vette servo in a tranny that does not have the shift timing calibrated for it, you will get binding on the 2-3 shift since the band will not release before the 3-4 clutch pack engages. Rarely do 700-R4's wear out due to 2nd gear band slippage, but this binding condition will help it to wear out quickly.

    The Corvette servo is only for rebuilt truck 700's that are calibrated for it (ask your shift kit manufacturer) and Corvette 700's. Slapping it into a stock Blazer tranny will not improve shift characteristics and will wear it out faster.

    That being said, it is relatively easy to swap the servo, since it can be done with the transmission in place. All you really need to replace is the 2nd apply piston and the piston housing. You can get these from GM for about $40 and the rest of the parts are common with the Servo you already have. This approach also avoids the possibility of changing the depth of apply pin, since there were different ones for different models and years. So the the fluid should be drained, the cover has to be pulled out, the seal removed, and then the whole servo can be pulled out. You disassemble it partially and reassemble it with the two aforementioned parts. You may also need a new seal since it's hard to get the cover off without ruining it.

    <font color=blue>5-lugs: The sign of true weakness.</font color=blue>
     

Share This Page