• UPDATE! 4+3 FINNIALLY WORKING AS IT WAS INTENDED!!
  • UPDATE! 4+3 FINNIALLY WORKING AS IT WAS INTENDED!!
  • UPDATE! 4+3 FINNIALLY WORKING AS IT WAS INTENDED!!
  • UPDATE! 4+3 FINNIALLY WORKING AS IT WAS INTENDED!!

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  1. #1
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    Default UPDATE! 4+3 FINNIALLY WORKING AS IT WAS INTENDED!!

    so i just picked up "Valerie" from the shop today and while i had orignally told them to put in a toggle switch for my OD (i was going to do this myself but with my work schedul its hard to find the time, plus im bad with wires) they found out that my switch was good this whole time!! just a few broken wires so they put in new wires with pigtails and my 4+3 as of right now is working just as GM intended it to. My question is this, for the most part I only want to use OD in 4th gear (the reason i wanted the switch was so that i could lock out the ecm from controling the OD) when i hit the button from 4th direct to 4th OD is it bad for the trans if I dont push the clutch down? Ive been told that downshifting from 4th OD to 4th direct while moving is HORRIBLE for the the trans, i was wondering if the same applies to upshifting?


    ps. If i turn my radio off while driving in direct mode If i listen VERY VERY closely I can hear something spinning, if i push the OD button it gets quieter but DOESNT GO AWAY..this isnt that bearing going bad is it? because i've been told that if the bearing is starting to wear the noise will go away in OD. am i paranoid?

  2. #2
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    Quote Originally Posted by Oldskool153 View Post
    my 4+3 as of right now is working just as GM intended it to. is it bad for the trans if I dont push the clutch down?
    Nice one
    You don't HAVE to use the clutch either way but it does take the load off the O/d when shifting so it is recommended.
    As far as the downshift ;if working correctly it should drop out of O/d when you nail it/ dependent apon speed , TPS , etc
    That was how the factory designed it so I don't see a problem with the 4th O/d - direct shift

  3. #3
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    lol i didnt mean not using the clutch when shifting gear i ment should I push the clutch down when i hit the button from 4th direct to 4th OD? lol

  4. #4
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    Quote Originally Posted by Oldskool153 View Post
    i ment should I push the clutch down when i hit the button from 4th direct to 4th OD?
    As I said , it is recommended to take the load off the O/d as it shifts.
    You don't have to hold it down like doing a shift; just a quick pop to the floor and up.

  5. #5
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    ok thanks

  6. #6
    tonylong
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    Quote Originally Posted by vetteoz View Post
    As I said , it is recommended to take the load off the O/d as it shifts.
    You don't have to hold it down like doing a shift; just a quick pop to the floor and up.
    Just out of curiosity - does this OD work like thr Jaguar 4+3's used to in the 60's? A planetary gear set that engages via a diaphragm clutch plate, providing straight thru (1 to 1 normal) or 4 to 3 (OD engaged).

  7. #7
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    I have no clue about the Jag. but I know the vet 4+3 does have planetary gears, im sure OZ can answer that question much better than I

  8. #8
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    Think of it as a 4 speed (BW Super T10 ) with a Powerglide on the back. Gives O/d option in top 3 gears hense 4+3.
    Nash Overview
    Nash Overview
    Nash Overview

    Read
    Ken Stapel's Corvette Obsession - Doug Nash Information

  9. #9
    tonylong
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    Quote Originally Posted by vetteoz View Post
    Think of it as a 4 speed (BW Super T10 ) with a Powerglide on the back. Gives O/d option in top 3 gears hense 4+3.
    Nash Overview
    Nash Overview
    Nash Overview

    Read
    Ken Stapel's Corvette Obsession - Doug Nash Information
    Thank you it was a good read and answered my questions.

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