Turbo 350 problem

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  • meatwagon
    #1

    Turbo 350 problem

    Having problem with a tranny. When it's cold at a stop it starts off in first, no problem. When it's warm at a stop it tends to start off in second (it will manually shift into first). The vacuum line to the modulator is good and there's no tranny fluid in the vacuum line. Is the modulator going bad? Any suggestions are greatly appreciated
    Tags: None
    • SpiderGearsMan
      No Life Outside BangShift.com
      • Oct 2007
      • 22359
      #2
      Re: Turbo 350 problem

      do you have your kick down cable attached ?
      the other day we noticed a real non "C" th350 has not been made in 31 years
      time flies

        Comment

        • IndyShiftman
          Superhero BangShifter
          • Dec 2007
          • 1122
          #3
          Re: Turbo 350 problem

          If you have a vacuum gauge, check the vacuum at the modulator when its warm. Should have good vacuum and it should drop when you rev the engine.
          Then if you have good vacuum and it fluctuates, take the governor out and check the valve inside by holding the gov upright with the gear pointed straight up and push the weights in. You should be able to see the valve inside move up and down. If it's stuck that's your problem. But if it's stuck due to debris then you may have a internal problem. Drop the pan and check for debris. Then overhaul if needed,

          Also about the gov. The gear should be in good shape. Not worn down in the middle. And the shaft shouldn't fit loosely in body that has the weights.

            Comment

            • meatwagon
              #4
              Re: Turbo 350 problem

              Had a kickdown cable and it felt "spring-loaded" so I'm assuming it's functional. When I see the car again I'll test the vacuum and pull out the governor and check it like Indy suggests. Thanks, guys.

                Comment

                • IndyShiftman
                  Superhero BangShifter
                  • Dec 2007
                  • 1122
                  #5
                  Re: Turbo 350 problem

                  It should take off in low even if it didn't have a kickdown cable.

                    Comment

                    • Caveman
                      #6
                      Re: Turbo 350 problem

                      On the TH350 in my '56 pickemup, the kickdown cable plastic thingy that bolts onto the case was leaking.....

                      So I cleaned it, and investigated. Turns out it was loose.... because the bolt had stripped out. *&^%$#@!!!

                      So I cleaned it up, put some red RTV on the threads and under the washer, and gently put it back in.


                      Indy, is my case now crap, or can I just drop the pan, drill it out, and re-tap it with a slightly larger thread bolt?

                      Whats underneath that bolt-down spot? Can I just drill it a 1/4" deeper and tap it and use a longer bolt?

                        Comment

                        • joe_rocket45
                          Superhero BangShifter
                          • Nov 2007
                          • 1098
                          #7
                          Re: Turbo 350 problem

                          a way to cheat that stripped out hole...
                          stick the small end of a zip tie in the hole and thread the bolt in, works about 100 times better than silly-cone

                            Comment

                            • IndyShiftman
                              Superhero BangShifter
                              • Dec 2007
                              • 1122
                              #8
                              Re: Turbo 350 problem

                              Originally posted by Caveman
                              On the TH350 in my '56 pickemup, the kickdown cable plastic thingy that bolts onto the case was leaking.....

                              So I cleaned it, and investigated. Turns out it was loose.... because the bolt had stripped out. *&^%$#@!!!

                              So I cleaned it up, put some red RTV on the threads and under the washer, and gently put it back in.


                              Indy, is my case now crap, or can I just drop the pan, drill it out, and re-tap it with a slightly larger thread bolt?

                              Whats underneath that bolt-down spot? Can I just drill it a 1/4" deeper and tap it and use a longer bolt?
                              Sometimes a slightly longer bolt will catch good threads in the bottom. Just be sure not to over tighten.

                                Comment

                                • IRONHEAD
                                  #9
                                  Re: Turbo 350 problem

                                  Originally posted by joe_rocket45
                                  a way to cheat that stripped out hole...
                                  stick the small end of a zip tie in the hole and thread the bolt in, works about 100 times better than silly-cone
                                  X2

                                    Comment

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