***Login to the Forum here ***

Support FSC and see no ads! - Click Here
Page 1 of 2 12 LastLast
Results 1 to 20 of 27

Kickdown not working...

This is a discussion on Kickdown not working... within the Technical / Maintenance forums, part of the General Discussion category; I just bought a 1990 Chevy 2500 with a 350. Sorry i cant remember the transmission, but the guy I ...

  1. #1
    Registered User
    Join Date
    Feb 2007
    Location
    Crandon, WI
    Posts
    11

    Cool Kickdown not working...


    Support FSC and see no ads! - Click Here
    I just bought a 1990 Chevy 2500 with a 350. Sorry i cant remember the transmission, but the guy I bought it from said it is the "Indestructable 4 speed" no overdrive. He also said something about turbo when decribing it.
    I have noticed that if you were to put it to the floor it wont kick down to "passing gear". If you are climbing a hill it doesn't dog down, it has pleny of power to get the job done but I dont know if it actually kicks down or just stays in the same gear. Also when you are going around 20-25 m.p.h. I know it does kick down when you push on the gas. It seems like it has the electronic kickdown.

    What should I do??????

  2. #2
    Knuckle Buster Coefficient's Avatar
    Join Date
    Jan 2007
    Location
    US of A
    Posts
    248

    Re: Kickdown not working...

    I believe 93 was the first year for the "E" electronic trannys. Yours should have come with the 700R4/4L60, not a "turbo" TH400 which is a 3 speed.

    Your problem may be the mechanical kickdown adjustment on the TBI for passing gear. I'm not too sure about the older versions so just take a look and see if there is another cable on the TBI that goes to the tranny.

    Here is a pretty good link for basic tranny info.
    http://en.wikipedia.org/wiki/Categor..._transmissions
    1994 Silverado K2500, 5.7 L, ECSB, 4:10's, Flowtech LT headers w/ FM 50 BB, Volant CAI. :fsc:

  3. #3
    Registered User josh89chevy's Avatar
    Join Date
    Aug 2004
    Location
    CT
    Posts
    265

    Re: Kickdown not working...

    There's no 4spd auto without overdrive. Is it definitely a 4spd? If so. 4th is overdrive, and it's a 700R4. If it's a 3spd it could be a TH350 or TH400. It should be a TV cable kickdown, not electronic. The reason it's not kicking down could be a misadjusted or even broken tv cable.
    Last edited by josh89chevy; 02-21-2007 at 03:42 PM.
    1989 Chevy K1500 350. 305s
    1988 Ford Mustang 5.0 LX
    1999 Suzuki Hayabusa. 16:1 1543cc. Stretched, slammed. Street tire, all motor, no wheelie bar. 8.9 @ 159 first time out. A lot left.
    1999 Buell X-1 Lightning: Under construction

  4. #4
    Registered Woman Pleaser Kick's Avatar
    Join Date
    Mar 2006
    Location
    Lakefield, MN/Brookings, SD
    Posts
    1,802

    Re: Kickdown not working...

    mines an 89 350 with a 700R4 so prolly that
    2013 2500HD Silverado.
    2000 Chevrolet 1500, Ranchhand, 285's, 16x8 soft 8's, in dash DVD, 600w JL 10".
    1994 Cadillac STS, 18" MB wheels, eibach pro kit springs, billet grille.(SOLD 8/27/11)
    1992 BMW 325i (SOLD 8/24/12)

  5. #5
    Registered User
    Join Date
    Mar 2005
    Location
    Oklahoma
    Posts
    316

    Re: Kickdown not working...

    8600lb 3/4 tons and 1 tons came with the Turbo 400 in 1990. The lighter 3/4 and half tons came with the 700r4. The TH400 is a 3 speed, no overdrive. 1991 was the first year for heavy 3/4 and 1 tons to get overdrive.
    Last edited by Buffalo; 02-21-2007 at 05:35 PM.
    Buffalo
    '90 Chev 3/4 ton 4wd, work-daily driver first, toy second

  6. #6
    Stock sucks CuZtOm90's Avatar
    Join Date
    Dec 2005
    Location
    CA
    Age
    28
    Posts
    1,028

    Re: Kickdown not working...

    If he said its indestructable its definately not a 700r :LOL: That being said its probably a TH400, pretty easy to figure out you either have a 4th gear or you dont..

  7. #7
    Chevy truck owner The_Ogre25's Avatar
    Join Date
    Jun 2005
    Location
    Kewanee IL
    Age
    34
    Posts
    975

    Re: Kickdown not working...

    Also the tv is not a kick down it is the transmission controller basically. If this is out of adjustment by very much your trans will not last long.

  8. #8
    Registered User
    Join Date
    Feb 2007
    Location
    Crandon, WI
    Posts
    11

    Exclamation Re: Kickdown not working...

    I drove it around a little today and it is a 3 speed.(TH400 sounds right) There is only one cable going to the throttle body and no cable to transmission
    so I'm thinking it may be electronic. Which module controlls the "kickdown"? There is a metal module with 4 wires going in on the left rear of the throttle body (10 o'clock looking from front of truck) and a module with 3 wires going in (9 o'clock)
    All comments appreciated...
    Last edited by landscaperluke; 02-21-2007 at 08:48 PM.

  9. #9
    speed freak outlaw_king's Avatar
    Join Date
    Mar 2005
    Location
    Fort Worth, Texas
    Age
    41
    Posts
    234

    Re: Kickdown not working...

    i dont think th400's have a kick down do they? or is that what the transmission modulator does on the side of the transmission. i know that our dually has a th400 and i dont remember it ever kicking down.


    1991 RCSS, 4-6 drop,18's, 2" cowl hood, air lift helper bags, spray in bed liner, roll pan, hidden hitch, 4.3 v6 automatic, electric fan.

  10. #10
    Registered User
    Join Date
    Feb 2007
    Location
    Crandon, WI
    Posts
    11

    Re: Kickdown not working...

    I think you may have a point. It doesn't look like there has been a cable hooked up for at least a long time. Either that or it was taken off some time ago. I don't know much about Chevy's yet but I can learn. Also when changing the oil cooler lines I looked all over the tranny for where it could hook up.

  11. #11
    Resident Dick Quyonmob's Avatar
    Join Date
    Nov 2005
    Location
    Lanark, Ontario
    Age
    33
    Posts
    14,704

    Re: Kickdown not working...

    Quote Originally Posted by Buffalo
    8600lb 3/4 tons and 1 tons came with the Turbo 400 in 1990. The lighter 3/4 and half tons came with the 700r4. The TH400 is a 3 speed, no overdrive. 1991 was the first year for heavy 3/4 and 1 tons to get overdrive.
    I have an 8lug 1990 2500 at work with a factory 700r4. Must be a late year production.

    Quote Originally Posted by outlaw_king
    i dont think th400's have a kick down do they? or is that what the transmission modulator does on the side of the transmission. i know that our dually has a th400 and i dont remember it ever kicking down.
    TH400's are, for the most part, vacuum controlled.
    Last edited by Quyonmob; 02-22-2007 at 01:00 PM.

  12. #12
    Knuckle Buster Coefficient's Avatar
    Join Date
    Jan 2007
    Location
    US of A
    Posts
    248

    Re: Kickdown not working...

    If your running the TH400 then your kick downs are due to the vacuum modulator which should be adjustable for shift firmness as well. It could need replaced if shifts are not what they should be.
    Last edited by Coefficient; 02-22-2007 at 01:06 PM.
    1994 Silverado K2500, 5.7 L, ECSB, 4:10's, Flowtech LT headers w/ FM 50 BB, Volant CAI. :fsc:

  13. #13
    Registered User
    Join Date
    Feb 2007
    Location
    Crandon, WI
    Posts
    11

    Lightbulb Re: Kickdown not working...

    So could a vaccum leak somewhere in the system cause such issues...?
    Last edited by landscaperluke; 02-22-2007 at 01:16 PM.

  14. #14
    Registered User
    Join Date
    Feb 2007
    Location
    Crandon, WI
    Posts
    11

    Re: Kickdown not working...

    In speaking with the local mechanic, I've found that there is indeed supposed to be a tv cable (kickdown cable). I see where it is supposed to be connected to the throttle body but cannot find where it connects on the tranny. Anyone have any info on this or even pics?
    Last edited by landscaperluke; 02-23-2007 at 06:11 PM.

  15. #15
    Registered User
    Join Date
    Mar 2006
    Location
    hudson valley NY
    Posts
    226

    Re: Kickdown not working...

    On my 86 1ton with the th400, the kickdown was electronic, yes i'm sure i had to fix it. It had a switch mounted higher up on the gas pedal so if you pushed it down enough it would kick the switch on. When i first got it the switch would never trip. I took it off made new holes to mount it, and voila it would kickdown. My 89 th400 1ton has only the vacuum modulator as far as i know, but i can't say i've looked.
    "there's not a battle tank in any army that could stand up to 10 heavily armed rednecks in a Cadillac convertible." - M. Ivins




    89 GMC K3500 dually ex cab 454 th400 3" cat back with hooker aerochamber
    open element air cleaner

  16. #16
    Registered User
    Join Date
    Mar 2005
    Location
    Oklahoma
    Posts
    316

    Re: Kickdown not working...

    Mine came from the factory with a TH400. The only two cables attatched to the throttle body are the accelerator pedal and the cruise control.
    Buffalo
    '90 Chev 3/4 ton 4wd, work-daily driver first, toy second

  17. #17
    Chevy truck owner The_Ogre25's Avatar
    Join Date
    Jun 2005
    Location
    Kewanee IL
    Age
    34
    Posts
    975

    Re: Kickdown not working...

    As far as I knew all the 400's had the electronic kickdown like mentioned above.

  18. #18
    Habitual Troublemaker cancritter's Avatar
    Join Date
    May 2006
    Location
    Alberta Canada
    Age
    55
    Posts
    4,387

    Re: Kickdown not working...

    when l first bought my 88 (used) l had it 1 week and the friggin tranny went out on it....turns out it was the wrong tranny...the folks who sold the truck to me basicly laughed...they had stuck a handy 400 in place of the original 700r4.....

    Check your build sheet in the glove box and check out which tranny your truck came with orriginaly....may be the tranny aint susposed to be in there...my 88 had a kickdown and my 91 has one,,,was quite surprised to read these posts and find out they did put 400s in after 88
    [Stole/FOUND 13/03/08 :O)
    91GM 4x4 excb 5.7 @ 40 over, Westers,Eld 3704.Lunati Trickflow 195 @1.6 RR,Walpro 190/overbuilt 700r4 /TCS TC,4.10/tru trac,14 blt,Hooker LT,areofilter,Extreme TBI.MSD.AGR still adding
    07/ 6.7 Cummins..truck included
    70 fury 3
    71 sport fury GT

  19. #19
    Registered User
    Join Date
    Aug 2006
    Location
    Modesto
    Age
    25
    Posts
    26

    Re: Kickdown not working...

    all th400 have a small electric switch that mounts on somewhere on the throttle arms on carb/tbi. when the turbo 400 came out in late 60's also had electric kickdowns the 2spd in my 67 firebird has a electric kickdown

  20. #20
    Registered User
    Join Date
    Feb 2007
    Location
    Crandon, WI
    Posts
    11

    Re: Kickdown not working...

    How do I identify which tranny I really do have? I wouldn't think they would have put a th350 in a 3/4 ton truck.
    BTW: I did find a single male electrical plug on drivers side of transmission but could not find any type of switch on or near accel. pedal/linkage. Is there a switch right on throttle body?

 

 
Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •