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91 LTC AOD "Slipping Issue"

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    #16
    The seal is in the transmission, not related to the drive shaft other than the drive shaft goes through the middle of the seal

    exception is if the drive shaft slip yoke is damaged where the seal rides. Most of the time you can just wipe it off and its fine but if someone put it in a vise to do U joints like the original on my car, its never going to seal.


    DO NOT drive an AOD car with the bushing broken. They self-destruct almost immediately.
    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

    Everything looks like voodoo if you don't understand how it works

    Comment

      #17
      Ok that makes sense. Thank you. i will make sure not to use a vice when doing the U joints. The TV link is snaped in place on the actual line, and in the bracket tight. I think it started to come out. The part is ordered, and car was just pulled off of ramps, and pulled under the carport.

      Comment

        #18
        The part should be arriving soon! I have kept an eye on the slight drip from the rear seal of the transmission, and with proper fluid level, and putting the tv cable back in place 100% has made the downshift happen perfectly at 50mph.

        My plan is to put this new brass bushing/ grommet on, and do the fluid and filter this weekend. I am a bit confused. My vehicle owner's manual states Mercon, but I have been advised in the past to use Mercon V. The plan was to use mercon v supertech, with a wix filter. Then take it to a mechanic in a few months to switch to amsoil with motorcraft filter.

        Comment

          #19
          Some might consider Mercon V to be overkill but it may offer some benefits. Is the leak from the rear main seal of the engine or a trany seal? As far as doing the trany refill in a few months - why? Sounds like you already have a good plan so wht do another drain and refill?
          What I Own: 1993 Mercury Grand Marquis GS
          What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

          Comment

            #20
            original Mercon isn't made anymore. The AOD originally used Dexron II, then someone at Ford realized it was stupid to buy fluid from GM so they made a tiny change and called it Mercon. For years you could buy Mercon / Dexron III compatible fluid because it was essentially the same thing. The dipstick on my 86 calls for Dex 2, the 91 Mark VII calls for Mercon. The ZF box in my diesel also wants Dexron so I just run Merc/Dex III compatible in all of those.

            when Ford discontinued original Mercon they issued a TSB that basically said if it called for Mercon, use Mercon V now.

            its a semi-synthetic fluid with friction modifiers that fix torque converter shudder. The AOD does not have a torque converter clutch though, so it doesn't really matter all that much. The Mercon V maybe has better high temp properties? Don't honestly know there.

            also don't really see much point in changing it twice in a short time period. The AOD has a torque converter drain so you can get very nearly all the fluid out between the converter and the pan.

            just make sure you don't over-torque the filter. It can tweak the valve body slightly and that can hang up the 3-4 shift valve. Make sure the filter gasket goes on too, it will suck air and not want to move correctly otherwise.
            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

            Everything looks like voodoo if you don't understand how it works

            Comment

              #21
              The vehicle had been sitting, and I do not think the previous mechanic had put mercon v in it. I want to basically use cheap fluids for a few months, before going to amsoil, as a fresh start I guess.
              I plan on doing a lot of towing with this vehicle. Digital Nomad Life. I always heard that mobil 1 skip royal purple and go to amsoil when I used to hang around shops a bit.

              Thank you for the information, that really clears my confusion. I saw Dexron in ford forums, and only dealing with 91, 92, 92, 97, and 00, fords, I am ignorant of the 80s fords. Loved the grand marquis wagon with the 302 my pops had.

              One day I want to build a mark 7 or 8 drift car. How do you like your MarkVII. Is that factory triple black?

              Comment

                #22
                I should update my sig. I wrecked that one several years ago. The one I have now is white with a dark red interior. Its stock, and its a nice car,
                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

                Everything looks like voodoo if you don't understand how it works

                Comment

                  #23
                  I love my Lincoln for the fact I can drive it, and not care if I hit the brush. Sorry about your wreck. Finding those mark 7 or 8's for 1500 without engine or trans, is alluring.

                  Comment

                    #24
                    I got the rust-free one I have now for 1300 in running / driving condition. The black one had rust issues and I paid more for it, plus had a lot more money dumped into it. I could in theory fix the black one enough to make it drivable again, I just don't care enough to bother. I have two cars that it can be a parts car for.
                    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

                    Everything looks like voodoo if you don't understand how it works

                    Comment

                      #25
                      I bought this one for 1500 6 years ago, and have probably 2 more thousand in it. so 3,500/ 48 = $73 a month! My 66 thunderbird was rust free 65000 original miles, all original besides the "upgraded" mustang 2 brake booster, and I was terrified to drive it, never had as much fun as I have had with this one. I am not afraid to work on this one. My brakes work better than when I had professionals replace them. Soon we won't be driving anyway, so I'll enjoy my POS until the American Conservatives & Liberals give away everything.

                      Comment

                        #26
                        Well that is a bummer. Received a steel "HD replacement" not good. Too bad, my crystal cut worked out well, however.

                        Comment

                          #27
                          steel is fine, there is nothing magical about the brass one, other than its not brittle plastic. The geniune Ford brass part i think is out of production and the pricing has gotten real stupid.
                          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

                          Everything looks like voodoo if you don't understand how it works

                          Comment

                            #28
                            It just seems a little loose. If I can't find a brass one, I think I should sand paper the edges. I wouldn't leave a bad review, just warning definitely not brass.

                            Comment

                              #29
                              bushing for the throttle body:
                              lmr.com
                              https://lmr.com/item/LRS-7303A/87-93-Mustang-Aod-Brass-Tv-Cable-Bushing-Kit


                              They also have the plastic one for the trans end as well if you need that one. It's rarely an issue at that end, but does eventually die as well, but doesn't completely fall off typically.

                              Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                              rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

                              Originally posted by gadget73
                              ... and it should all work like magic and unicorns and stuff.

                              Originally posted by dmccaig
                              Overhead, some poor bastards are flying in airplanes.

                              Comment

                                #30
                                Do you like that parts store? I think I will buy another when I grab the trans end one. It is just weird, the old part fit perfectly snug, no play.

                                Comment

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