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how much is one of these worth ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by riz, Dec 28, 2001.

  1. riz

    riz 3/4 ton status

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    <font color=purple> A corvette Servo for a 700R tranny ? How much ? Also, what benefits would it give me ?

    Thanks in advance !

    L8r,
    . Riz . <a target="_blank" href=http://www.geocities.com/rizmonkey>www.geocities.com/rizmonkey</a>

    <font color=purple> BOW CHICKA BOW WOW !
     
  2. 1986Blazer

    1986Blazer 1/2 ton status

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    I am not sure of the cost but the guys that make and sell the Raptor 700R4 sell the corvette servos on their site.....check it out. I do not have the web address handy though.

    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  3. 1986Blazer

    1986Blazer 1/2 ton status

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    Found the site:

    http://www.geocities.com/keywestk5/KeyWestK5.html
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Riz...do a search for 700R-4 stuff. I seem to recall an article that was linked that talked about corvette servo's. I seem to recall they actually caused more problems in a non corvette 700 than anything. I would guess the post may have been as much as a year ago...

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Think you can still buy them from GM as well. Of course, since its a 'Vette piece. Might check gmpartsdirect.com prices if you can get a GM part number for it.

    The 200-4R aftermarket "Grand National" style servos are going for around $90 last I checked, if that gives you any idea.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    OK Riz...I found some relevant info on the Corvette servo. I couldn't find the link I had read but this should help anyways.

    <a target="_blank" href=http://coloradok5.com/forums/showthreaded.php?Cat=&amp;Board=blazer4x4&amp;Number=94316&amp;page=&amp;view=&amp;sb=&amp;o=>http://coloradok5.com/forums/showthreaded.php?Cat=&amp;Board=blazer4x4&amp;Number=94316&amp;page=&amp;view=&amp;sb=&amp;o=</a>

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  7. riz

    riz 3/4 ton status

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    <font color=purple>I thought there were a few comments on this servo a few weeks ago ............ anybody got one in theirs ? I might be able to get one relatively cheap and would need to know if I should get it or am I wasting my time. Thanks for the input so far.

    L8r,
    . Riz . <a target="_blank" href=http://www.geocities.com/rizmonkey>www.geocities.com/rizmonkey</a>

    <font color=purple> BOW CHICKA BOW WOW !
     
  8. outlaw612

    outlaw612 1/2 ton status

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    I just had a shift kit put in my 86 K10. The corvette servo was also installed. If I remember corectly, it helps to firm up the 2-3 shift.

    <a target="_blank" href=http://www.geocities.com/outlaw613/K5.html>http://www.geocities.com/outlaw613/K5.html</a>
     
  9. thatK30guy

    thatK30guy 1 ton status Premium Member

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    A stupid question from me: what makes the Vette servo's so special or better than the stock ones? (I'm no tranny-internals expert!) [​IMG]



    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  10. riz

    riz 3/4 ton status

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    <font color=purple>That kinda what I'm trying to find out too, Wes ......... It sounds like it helps shifts between 2-3 but also sounds like it will wear down your internals much quicker ........ the jury is still out on this one !

    L8r,
    . Riz . <a target="_blank" href=http://www.geocities.com/rizmonkey>www.geocities.com/rizmonkey</a>

    <font color=purple> BOW CHICKA BOW WOW !
     
  11. Itali83

    Itali83 1/2 ton status

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    It lets overdrive engage under full throttle, or the converter to lock up under full throttle, one of those. I know it allows engagement of something under full throttle to get more top speed.
    Ben 87 Jimmy
    <font color=blue>Rust=Bad!!</font color=blue>
    <a target="_blank" href=http://www.bens87toy.alloffroad.com>www.bens87toy.alloffroad.com</a>
     
  12. CaptCrunch

    CaptCrunch 1/2 ton status

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    The Vette servo is bigger which is the main reason people have used it. The main flaw is that it is designed to be used with the Vette valve body and aux. valvebody. With a regualr 700r4 valvebody it creates a hard shift.... which alot of times can lead to breakage or heavy wear to other weaker parts of the tranny. The two guys I know who do trannys don't recomend them. One has been using their own modified servo which is simailar to the ones used in the police caprices.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  13. riz

    riz 3/4 ton status

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    <font color=purple>Mikey, Do you recommend the ones like the police caprices ? If so, would it be worth looking into ?

    L8r,
    . Riz . <a target="_blank" href=http://www.geocities.com/rizmonkey>www.geocities.com/rizmonkey</a>

    <font color=purple> BOW CHICKA BOW WOW !
     
  14. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well Riz... My one good buddy Pete who did my trannys for me for almost ever recently quit the whole business (or side business LOL) since he had a heartattack. The other guy I know pretty well is a guy up in Hugo that runs his own tranny, tcase, and differental shop on his hobby farm setup. He is all certified and such... he actually will split the case or whatever open and go through it with you as you watch... he will tell you what went wrong and what he will do to fix it. It is pretty cool if you have never been through any trannys and such. Another friend of mine had a tranny fdone in this fashion and he was ammazed, but anyways to get back on track [​IMG] But both guys have said there really isn't much of a nedd for the vete servo. Boith think it is pretty overated and the shifts or shift kits can be done without such a kit. IMO I'd just let the tranny go till she dies then find a repuable builder that knows 700's well to rebuild it and go by there recomendations. For local big name places Kennedy transmission down in Apple Valley (Talk to dave Kennedy) does excellent work. Each place or builder has a little bit of a different way they do things but essentially all the mods are done for similar reasons. Towing can be a big reason for changes, but only if you are towing a considerable amount of weight. I don't think it is worth the cash to upgrade the servo on it's own though if that is what you mean. I had a custom done up servo in my old firebird street terror (87 firebird w/ about 400 or so ponies at the rear wheels) and the tranny was dream. Loved it to death... never faultered and shifted like mad! Just keep it cool and it was a happy tranny.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  15. greg83k5

    greg83k5 1/2 ton status

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    vette servo keeps trans in overdrive in highspeed situations where otherwise it would hunt in and out 'cause of tv cable input......

    ** i'm so money **
     
  16. Lonnie

    Lonnie 1/2 ton status

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    The TV valve/sleeve is what controls the full throttle OD shift.

    The Vette servo only controls the 1-2 shift firmness. There are also larger ones sold by the aftermarket for even firmer shifts.... but after trying one &amp; exploding the spider gears in my 12bolt Eaton posi... I'd stick with the Vette unit. The Vette servo along with a HD type shift kit will give firm shifts...slight chirp on 35" BFG's. Stay away from the street/strip shift kits with this servo unless you have 14bolt rear w/ HD u-joints etc. to prevent part breakage.
    Lonnie
     
  17. CaptCrunch

    CaptCrunch 1/2 ton status

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    Have to disagree there... like Lonnie said, but I still don't care for the vette servos. On the street you can say it will work, but put a nice Beck's race engine like Riz has in his Blazer putting power to it you are gonna see some hurt pieces or at the very least early failure. I have driven a car with the vette servo in it (also was beefed up big time internally with a race sprag, etc.) and it was a blast to drive... well that was until something broke... opps... 10B car rear end... doh! A real good shift for tranny life is neither hard, nor is it slow. Hard shifts place great chages in stress on components... a slow lazy shift can burn up clutches and overheat the tranny. A shift that chirps the tires(none the less 35" MT's) obviously isn't gonna live as long as a stock GM unit. Also consider the stress applied by lockers... big power motors, and big tires. Shell and sprag would be wise upgrades if you plan for that route, otherwise for regular shift firmness the units usually hold up ok. (They are just seen as weak when you try the performance game on them). As I said before the vette servo is designed to work with the aux. valve body of the corvette 700's. This dampens the shift to a safer level. So by throwing the servo in alone it is a totally mis-matched component. With proper work to the tranny it can be made to work well, but alone it is not a good thing. Overall there are a lot of opinions of the rebuilds of 700's (like other trannys) and of vette servos, but using my knowledge from tech school, real life experiences, the expertist on a 60 year old tranny rebuilder (who has done every 700r4 tranny that has come into the shop he is at since the early eighties), a 40 year old tranny rebuilder (with his own shop), and through just general conversation with the oiwner of a large tranny shop chain here in MN.... all have said it is kinda out dated and there are better ways to make the tranny shift the way you want it... for hrashness or max. life and that may or may not need addition upgrades.

    I guess here is where my knowlege is replaced with newbie... I understand why a drag car would want a hard shift... even a moderate or slightly quicker shift for a street/strip terror, but why would you want it for you daily driver or offroad truck unless you were doing mud or sand drags? I see where a nice quicker and tad bit firmer shift would be nice... especially for a tow rig, but that can all be down with easy modifications to your valve body and a couple spring and valve chages.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  18. riz

    riz 3/4 ton status

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    <font color=purple> Holy Moly, Mikey ! Awesome advice ......... the Corvette sr=ervo is no longer on my mind ........ I too have found that the whole tranny would have to be redone to make it work correctly......... I'll leave it till it blows like you said ...... I just don't know what condition it is yet ..... Just thinking ahead and there was one for sale on e-bay last week for a good price and was thinking of getting it but now have changed my mind on the issue.

    L8r,
    . Riz . <a target="_blank" href=http://www.geocities.com/rizmonkey>www.geocities.com/rizmonkey</a>

    <font color=purple> BOW CHICKA BOW WOW !
     

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