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low rpm shudder, clunky overdrive downshifts

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    low rpm shudder, clunky overdrive downshifts

    I just did the full HO conversion on my 89 Lincoln with 63K. Now when its at low RPM's there is little to no power and the whole car shakes in a rhythmic pattern until RPM's rise. Also when I'm braking and the car shifts out of overdrive it clunks noticably. Ran smooth as glass before the HO conversion, whats up?
    1989 Lincoln Town Car - "Anabelle" - Original block, .030 over with SpeedPro pistons, rods fitted with ARP hardware, FRPP +volume oil pump, GT-40 3bar heads, Crane 1.72 rockers, 89' Fox cam, 93' Cobra lower intake, Explorer upper and 65mm TB, 93' Lightning EGR spacer, K&N intake kit from a 4.0L Ranger, 19lb/hr injectors w/ 87 Mark VII ECM, cat/smog deletes, Big Brake conversion, 3.55 K-Code Trac-Lok/Disc brake rear axle, CVPI LCA's w/1" sway bar in rear, wagon front sway bar, BBK 2.5" off-road H-Pipe, Flowmaster super 40s, HPP wheels, 3G alternator w/LMR.com wiring kit, gear reduction starter conversion, Best 1/4 time: 16.0 @ 85mph.

    #2
    the aod plague struck you too?

    Comment


      #3
      Bump up your TV pressure.

      does it clunk when you put it in gear?
      1983 Grand Marquis 2Dr Sedan "Mercules"
      Tremec TKO conversion, hydraulic clutch, HURST equipped!

      Comment


        #4
        Most AOD trannys have some sort of clunk going in and out of OD, as for the power, possibly an exhast leak somewhere? Don't forget that HO's have a higher torque band than lopos, but I'm guessing you knew that already. just my $0.02. Oh yea...TV cable?...maybe?
        Nick
        88 Colony Park LS
        G-pa's old car, but he's cruisin around heaven in his 69 wagon now
        Future plans:Semi HO conversion, or Explorer motor swap, shift kit, PI springs and sway bars, KYB-GR2 shocks

        Comment


          #5
          Could be a sensor if TV cable wasn't touched. I just replaced the coolant temperature sensor in my car, and it was doing pretty much the same thing. Low rpm shudder, downshifting in slow speed traffic (45-20-5mph) was kinda clunky too. The car also couldn't find its idle either, even with the sensor connected. Drove around the other day after I fixed it and ran and shifted smooth with no problems.
          Current rides - 1991 Ford Thunderbird 3.8 v6 (gas saver/DD) - New Heads/Headgaskets with ARP studs, Air Silencer Delete, 70mm MAF, Plasti-dipped Matte Black with a Silver Metalflake Overlay, Muffler Delete, some LED's, 30.233 MPG for high MPG average!
          2006 Jeep Wrangler 4WD (fun vehicle/backup DD) - 4.0/6spd - too many mods to list.

          Associated Panthers:
          Father's 1994 Ford Crown Victoria - Stock, 45,000 miles.
          Sold in 2007 - 1987 Mercury Grand Marquis LS "Grandpa Special" 2 door.
          http://www.cardomain.com/ride/2128327

          Comment


            #6
            Check that TV pressure...
            1983 Grand Marquis 2Dr Sedan "Mercules"
            Tremec TKO conversion, hydraulic clutch, HURST equipped!

            Comment


              #7
              feels like the camshaft is wrong for the transmission or something
              1989 Lincoln Town Car - "Anabelle" - Original block, .030 over with SpeedPro pistons, rods fitted with ARP hardware, FRPP +volume oil pump, GT-40 3bar heads, Crane 1.72 rockers, 89' Fox cam, 93' Cobra lower intake, Explorer upper and 65mm TB, 93' Lightning EGR spacer, K&N intake kit from a 4.0L Ranger, 19lb/hr injectors w/ 87 Mark VII ECM, cat/smog deletes, Big Brake conversion, 3.55 K-Code Trac-Lok/Disc brake rear axle, CVPI LCA's w/1" sway bar in rear, wagon front sway bar, BBK 2.5" off-road H-Pipe, Flowmaster super 40s, HPP wheels, 3G alternator w/LMR.com wiring kit, gear reduction starter conversion, Best 1/4 time: 16.0 @ 85mph.

              Comment


                #8
                Originally posted by 89LincolnTWNcar
                feels like the camshaft is wrong for the transmission or something
                Sorry bro, but that doesnt make sense lol...
                1983 Grand Marquis 2Dr Sedan "Mercules"
                Tremec TKO conversion, hydraulic clutch, HURST equipped!

                Comment


                  #9
                  yeah i know hahaha, it vibrates all along the powerband if I am accelerating to get on the highway.
                  1989 Lincoln Town Car - "Anabelle" - Original block, .030 over with SpeedPro pistons, rods fitted with ARP hardware, FRPP +volume oil pump, GT-40 3bar heads, Crane 1.72 rockers, 89' Fox cam, 93' Cobra lower intake, Explorer upper and 65mm TB, 93' Lightning EGR spacer, K&N intake kit from a 4.0L Ranger, 19lb/hr injectors w/ 87 Mark VII ECM, cat/smog deletes, Big Brake conversion, 3.55 K-Code Trac-Lok/Disc brake rear axle, CVPI LCA's w/1" sway bar in rear, wagon front sway bar, BBK 2.5" off-road H-Pipe, Flowmaster super 40s, HPP wheels, 3G alternator w/LMR.com wiring kit, gear reduction starter conversion, Best 1/4 time: 16.0 @ 85mph.

                  Comment


                    #10
                    More pressure. It'll let the trans downshift so it doesn't labor along like that. My car does the same crap with the tv set wrong, and its a trans with an HO governer. I bumped mine up last night because I got tired of that crap. Its actually slightly too high and it'll drive at like 35 mph in second unless I get off the gas totally to force a shift. Before it was shifting into OD by 40 mph, which sucks.
                    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


                      #11
                      EXACTLY, my car wants to go into overdrive too early for the mustang cam, its still set for the OPC (old people cam) hah. How do I go about changing TV pressure safely?
                      1989 Lincoln Town Car - "Anabelle" - Original block, .030 over with SpeedPro pistons, rods fitted with ARP hardware, FRPP +volume oil pump, GT-40 3bar heads, Crane 1.72 rockers, 89' Fox cam, 93' Cobra lower intake, Explorer upper and 65mm TB, 93' Lightning EGR spacer, K&N intake kit from a 4.0L Ranger, 19lb/hr injectors w/ 87 Mark VII ECM, cat/smog deletes, Big Brake conversion, 3.55 K-Code Trac-Lok/Disc brake rear axle, CVPI LCA's w/1" sway bar in rear, wagon front sway bar, BBK 2.5" off-road H-Pipe, Flowmaster super 40s, HPP wheels, 3G alternator w/LMR.com wiring kit, gear reduction starter conversion, Best 1/4 time: 16.0 @ 85mph.

                      Comment


                        #12
                        As a beginning start with this: http://www.lincolnsonline.com/tech/00138.html

                        Comment

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