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Delete TH350 Kickdown

Discussion in 'The Hokey Ass Message Board' started by 32cruzer, Jun 29, 2010.

  1. 32cruzer
    Joined: Nov 21, 2008
    Posts: 18


    Hey gang, Building my first Auto/Manual shift car, TCI TH350 streetfighter trans w/ratchet shifter in a '29 Model A Lowboy w/392 Hemi. Sure won't need a kickdown shift, so I'd like to avoid hooking one up to the carbs.

    Question is what is the best way to block it off at the tranny?
    I assume the little lever should be in as far as it goes?
    Should I just RTV the heck out of the hole?

    Thanks to all.
  2. troylee
    Joined: Jul 10, 2007
    Posts: 683


    do you have a manual valve body trans?
  3. Imwalkin
    Joined: Jul 29, 2004
    Posts: 545

    from Tucson, Az

    My last car did not use the kick down cable. I just had the builder just put in the part of the cable that bolts to the trans and I RTV;d the end of the cable sticking out.
  4. I did the same thing. If you need to drop down to second you just need to do it manually. I really don't miss it at all. Todd
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  5. Hackerbilt
    Joined: Aug 13, 2001
    Posts: 6,240


    Works with a T350 but don't even think about doing it to a 700R4. Different animal entirely and you'll kill the trans!!!
    Just needed saying in case someone assumed they were all the same....;)
  6. I just ran into an elegant solution to this today while attempting to INSTALL a kickdown on a stock T350 that had been run without.

    The hole for the kickdown was tapped, and either has a pipe thread plug or allen set screw plug, installed.

    Blue locktite and "off you go"
  7. 32cruzer
    Joined: Nov 21, 2008
    Posts: 18


    Thanks so far for replies.
    The TCI tranny is a Auto that can be manually shifted, but not a manual only valve body. My others always had yankerss & 3 pedals, but this one just a yanker!
    Your right, only do this with a TH350.
    I hate to spend $ for a cable & cut it off, the pipe plug sounds like a good idea.

    What do I do woth the little rod that sticks out? Pull the pan & remove it? Bend it in? Should it be pushed in all the way, or pulled out some?
  8. take the pan off, take out the little rod.

    I thought you had a full manual valve body--you SURE you don't wanna run a kickdown cable?
  9. 32cruzer
    Joined: Nov 21, 2008
    Posts: 18


    Yes I'm sure. The Hemi's punched out to 407 cubes and will make some serious power, in a 2300lb car, sure won't need a passing gear. So I'd rather not bother routing the linkage.
  10. If it's not a manual valve body then just hook it up, that's easier than taking the pan off and taking the wire out then blocking the hole off.
  11. Mr48chev
    Joined: Dec 28, 2007
    Posts: 26,712


    I've run a couple of 350's without the detent cable hooked up and unless you are shifting manually they shift way too soon. The detent cable's action is what keeps the trans in gear during light acceleration, otherwise if you let it shift it's self you are in third gear by the time you are up to 30/35 mph. That happens with my GMC right now with 4.11 gears .
  12. I just left my TH350 cable hanging around.
    I had always planned to hook it up someday.
    Someday never came.
    Eventually I changed to a 700R4, then I HAD to hook up a cable.
    I used a LOKAR cable kit for that. It is so much easier to hook up and adjust a LOKAR cable than it is to do a GM cable. So much more adjustable and easy to mount.
  13. 57JoeFoMoPar
    Joined: Sep 14, 2004
    Posts: 4,449


    I've had 3 TCI-equipped transmissions (2 TH350s and a 727 Torqueflight). All have had the kick-down removed in favor of manual operation. Be careful not to accidentally shift into 1st, but it shouldn't be an issue with the ratchet shifter. Mine was a regular Hurst Indy-matic.

    My last TH350 had no pump restrictor, no wave washers, no 2nd gear accumulator, auto/manual valve body, no kick-down and a 2500 stall convertor. It was AWESOME on the street and the track. Brutal chirp between 1 and 2
  14. gasserjohn
    Joined: Nov 9, 2008
    Posts: 1,219


    hook up the cable to some other spot on the linkage by the pedal
    or route the cable to a HANDy spot so you can control it like we do on the 4spd hydrostick
  15. bentwings
    Joined: Jul 1, 2007
    Posts: 132


    My kick down is deleted for a good reason....I don't want unexpected downshifts especially on the interstate ramps. Traffic here thinks these are to play Mario Andretti.

    I disagree on the low up shifts. if anything mine shifts a bit too high for my liking. 1-2 comes ar 4500 and 2-3 comes at 42-4400. There is no advantage to hanging them higher on the street. Don't need passing gear either. Just go to boost. Only a few can out boost me or 'gass' me (NOS) haha:eek:

    Blown SBC in a 41 Willys streetrod. Just past 6500 total miles on it. 5000 this year.
  16. 32cruzer
    Joined: Nov 21, 2008
    Posts: 18


    Thanks Hambers, Lots of good input.
    The trannys still sitting on the floor. Going to pull the pan to install a bung in it for a temp gauge, so I figure on removing the kickdown rod assy and checking out the the pipe plug route that moparsled suggested.

    Guess I'm a bit bass ackwards. My 32 Chevy has a Muncie M20 (13.30 ET's) , but my Hemi Lowboy will have a semi-auto!
    Last edited: Mar 14, 2013
  17. lanny haas
    Joined: Nov 1, 2008
    Posts: 560

    lanny haas
    from Phoenix AZ

    the cable works like the throttle linkage on the old power glid.throttle pressure keeps it from shifting too soonand also down shifts it. that is why t is aso adjustable. get out the motors automatic manual and read about.
  18. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 6,173


    Not needed at all! Tap and plug the hole. Summit badged TH350 trannys do not come with the cable, or need the cable. Manually drop down to lower gears, and throw a shift kit in it if it does'nt already have one. Same goes for modified Powerglides, the throttle pressure valve and kickdown get deleted. Butch/56sedandelivery
  19. chopped
    Joined: Dec 9, 2004
    Posts: 1,919


    Well that explains it for me. Car shifts so fast into 3rd it feels like a 2 speed. I think I'll hook it up.
  20. 32cruzer
    Joined: Nov 21, 2008
    Posts: 18


    Late reply, but here's what I did.
    Took the little rod out and tapped the hole for a pipe plug. I did hook up the vacuum line. With the torque from the Hemi a 3000 stall converter 3.50 gears and a 2000# car it moves without any problem. On the level it goes about 20ft then auto shifts to 2nd without throttle. 2nd gear holds till about 30mph, still without throttle. If I throttle it, 1st is the same and 2nd really gets it going.
    I'm satisfied with it for normal driving. Leaving it in auto and going balls out works great too, and manual shift really gets the juices flowing. Actually I think the quick shift to 2nd is a plus against over-revving, kinda a built in burn-out shift!
    I would imagine if it was a heavier car the quick shift points would be more of an issue.
  21. After several similar threads, I am still waiting for someone to actually explain how the kick down cable which does NOT begin to move until full throttle has any effect on part throttle shifting.
    Last edited: Mar 14, 2013
  22. drptop70ss
    Joined: May 31, 2010
    Posts: 1,145

    from NY

    fixed it for you
  23. Mr48chev
    Joined: Dec 28, 2007
    Posts: 26,712


    My experience with both my 51 Merc with 350R Olds and turbo 350 and 71 GMC with 350/350 was that they both shifted a bit sooner than I wanted when leaving a light with a light throttle. The truck especially shifted sooner than I wanted. other than that not a lot of difference except no kickdown when you punched it at highway speeds. I drove the Merc about 80K that way including a trip to Texas and Bonneville in 1988. My wife and a couple of friends who drove the car never noticed the difference.
  24. Thanks, funny how you see what you meant to type and not what you actually typed.
  25. hoop98
    Joined: Jan 23, 2013
    Posts: 1,363

    from Texas

    It doesn't, as you know.


    In the WOT position it opposes governor pressure on the shift valve.

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