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    #1

    Faulty Transmission?

    I've only had my car about a GM about a week and i have noticed some problems with it. One major problem is that tha tranmission seems to jump on me. This car is a three speed automatic. When i get going about 40 the car is revves up loudly and just when you think the damn thing is going to explode it jumps into the next gear and jerks pretty badly. Can anybody tell me what to do about this? it we be much appreciated.
    Proud owner of a 1977 Mercury Grand Marquis 2 Door
    Tags: None
    #2
    Sounds like a transmission in dire need of a service. Probably the filter is gummed up and the valves in the body are sticky. Did this car sit for a long time? If so thats probably why. Service it (not sure if the C6 has a drain plug in the converter, someone will know) and see if it helps. Might also want to throw some magic transmission fix stuff, perhaps a bottle of Seafoam transmission stuff, for a few days before servicing it to help break up the varnish.
    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC grandpa spec white and cranberry

    1984 Lincoln Continental TurboDiesel - rolls coal

    Originally posted by phayzer5
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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      #3
      Well the car was actually sitting in an old lady's garage for ten years. But i will drain the transmission oil or take it into a shop and find out whats wrong with the thing. Thanks.
      Proud owner of a 1977 Mercury Grand Marquis 2 Door

      Comment

        #4
        Sounds like the vacuum modulator is either set too high, or toast. also check for a leaking, broken, or missing vacuum line going to the modulator. i would also check the kickdown rod adjustment, and check for binding, or bent rods. A fluid, and filter change are definitely in order, as the car sat for a long time.
        Mike

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          #5
          Excessively high shift point from 1st to 2nd is definitely a symptom of a missing vacuum line.

          Comment

            #6
            Thanks for all the help guys. I sure am glad i found this site.
            Proud owner of a 1977 Mercury Grand Marquis 2 Door

            Comment

              #7
              yep - also if you find the transmission end of the vacuum line and pull it, if any fluid comes out you need the valve.
              After replacing the mod valve in my 77 II it shifted better than ever.
              Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
              'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
              sigpic
              85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereo

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                #8
                oh yeah, I forgot this was a car with a vac modulator tranny. my bad. Could be simple cracked vacuum lines then.
                86 Lincoln Town Car (Galactica).
                5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                91 Lincoln Mark VII LSC grandpa spec white and cranberry

                1984 Lincoln Continental TurboDiesel - rolls coal

                Originally posted by phayzer5
                I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                Comment

                  #9
                  Hey I fixed it. Me and my dad were in the middle of changing the transmission oil and i took a look at the vacuum modulator and the hose had come loose. I replaced that and the oil and it runs better than ever. Thanks for all the help.
                  Proud owner of a 1977 Mercury Grand Marquis 2 Door

                  Comment

                    #10
                    Sweet!
                    1983 Grand Marquis 2Dr Sedan "Mercules"
                    Tremec TKO conversion, hydraulic clutch, HURST equipped!

                    Comment

                      #11
                      Good to hear man!


                      When are you getting pics!? I really want to see this monster!

                      2009 Ford F-350 6.4 powerstroke diesel. 1977 Ford F-150 built 300 six, 5 speed trans. 1976 MG MGB roadster, 359w, t5 5 speed. 1996 Kawasaki ninja ZX6R.
                      My rod is glowing, my bead is clean, my middle name is acetylene

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