1985 Corvette 4+3 disable kickdown
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
1985 Corvette 4+3 disable kickdown
Hey guys, I have a 1985 Corvette with a 4+3. I was wondering how I would go about disabling the kickdown function of the overdrive? I have 3.75s in the rear so if I stomp on it in overdrive I don't want it kicking down and blowing the motor because it thought I still had 3.08s.
I know I'm not supposed to go WOT in overdrive but I need to to get down the track. Have later plans for a ZF6 swap anyway.
Thanks!
I know I'm not supposed to go WOT in overdrive but I need to to get down the track. Have later plans for a ZF6 swap anyway.
Thanks!
Pro
Joined: Jul 2002
Posts: 703
Likes: 0
From: Milwaukee Wi
I dont quite understand. If not in OD it wont kickdown. I am never in OD cept when I need to use the 5th gear. anAyway I depress chutch and hit button and go to OD/5th. When I go back to 4th I do same. Then I floor it or shift to 3rd and floor it. 3.07 gears.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
I am talking about when I am driving in overdrive and I floor the gas, then it drops out of overdrive. I don't want it to do that I want it to stay in overdrive.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
http://forums.corvetteforum.com/c4-t...-4-3-84-a.html
http://forums.corvetteforum.com/1582048095-post7.html
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Try adjusting (or disconnecting ) the TV cable at the TB
http://forums.corvetteforum.com/c4-t...-4-3-84-a.html
http://forums.corvetteforum.com/1582048095-post7.html
http://forums.corvetteforum.com/c4-t...-4-3-84-a.html
http://forums.corvetteforum.com/1582048095-post7.html
This all happened with the TV cable disconnected. I talked to my dad's friend about this when he noticed my tv cable was hanging off to the side. He said I'm going to blow the overdrive unit with that disconnected, said it was for throttle valve pressure, to adjust the pressure depending on throttle or something.
So I'm not convinced that that cable is a kickdown cable.
Melting Slicks
Joined: May 2010
Posts: 2,082
Likes: 3
From: Conowingo Maryland
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
read this Dan the whole thing http://forums.corvetteforum.com/c4-t...djustment.html
But if that is truly the kick down cable, how come with my kick down cable disconnected, it kicked down when it went WOT?
Melting Slicks
Joined: May 2010
Posts: 2,082
Likes: 3
From: Conowingo Maryland
I do not have a 85 service manual look thru yours and read up on it. Like what was in my post is was a 1 year deal with the vettes I have no expericance with them. But the service manual should have a lot
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
I don't have one but I think the kickdown may be in the computer?
Melting Slicks
Joined: May 2010
Posts: 2,082
Likes: 3
From: Conowingo Maryland
Im going going back to the post I lead you to but if I recall in that post it says 85 is a standlone yr for the 4+3 and after 85 they move the function to the comp. That is why I said read it all
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
The shift to the far superior '165 ECM in '86 also bought about ECM controlled kickdown
Melting Slicks
Joined: May 2010
Posts: 2,082
Likes: 3
From: Conowingo Maryland
Thanks for clearing that up I spent about a half hr diging up the info for him last night I do not mind trying to help. I said read it all the way thru cause I knew the information he needed was there. I dont have a lot of interest in 85 4+3 and read thru it real fast but say what he was looking for. I felt at this point it was up to him to read in and research more. Dan as you know people on here will help. I did spend a half hr looking for something I had no interrest in. It kinda po me after doing this it did not appear that you read it hard to get the jiff of it.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Thanks for clearing that up I spent about a half hr diging up the info for him last night I do not mind trying to help. I said read it all the way thru cause I knew the information he needed was there. I dont have a lot of interest in 85 4+3 and read thru it real fast but say what he was looking for. I felt at this point it was up to him to read in and research more. Dan as you know people on here will help. I did spend a half hr looking for something I had no interrest in. It kinda po me after doing this it did not appear that you read it hard to get the jiff of it.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
I spend a lot of time doing research for people with questions because I am as interested in the answers as well as help ;
but when you present the facts you get the " you can lead a horse to water" response
In any case , for the OP's requirements I would run the O/d off a manual switch and delete any ECM / kickdown control
Last edited by vetteoz; Apr 30, 2014 at 10:37 PM.
3rd Gear
Joined: Oct 2014
Posts: 3
Likes: 0
1985 4+3
Just bought my first c4 don't nkow much about it yet, you mention that you didn't put you're OD on till your in fifth, mine is a four speed.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39