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Curious about the effects of installing W/R gears in the AOD and a 3.55L

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    #1

    Curious about the effects of installing W/R gears in the AOD and a 3.55L

    I currently have a stock AOD and HO out of a 89 MK 7 in the 1991 GM. I wonder how different acceleration will be if I swap in the W/R gear set and swap the 2.73 open out to a 3.55 locking rear axle? Will the gas mileage be better in city driving which I mostly do? How much quicker in the quarter mile after the swap?
    What would be estimated 1/4 mile times for a stock LOPO 91 GM and for a HO equipped 91 GM? Just curious.

    Thank you,
    Mike
    90 Colony Park LS with GT 40 heads and intake. HO cam, 65 MM TB, 67 MM EGR spacer. Has a 75 MM Pro Flow mass air sensor. Borla XS mufflers. 3L55. Shift kit, 2000 stall Tq convertor...Bilstein shocks, front and rear sway bars.
    90 Colony Park LS 64,000 miles all original. 3L55 tow package....front and rear sway bars.
    91 Grand Marquis GS....HO motor..Bilstein shocks poly bushings and police swaybars. This one handles the best.
    70 Torino Squire with M code 351 Cleveland 3.00 has Magnaflow mufflers. Hidden headlights and power windows. All original
    Tags: None
    #2
    The gas mileage should be a bit better in the city. The gears alone will make the biggest difference.

    Stock lopo runs high 18's to low 17's, an HO high 16's to mid 15's. There are so many factors to take into account but those are averagish numbers if all is somewhat well.
    2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
    2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
    2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
    1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

    Comment

      #3
      rear gears for sure... the WR helps a little, but not much. And without changing the valvebody with one designed to work with the WR gears, you'll be shifting weird. I know this for a fact as I daily drive a lopo with an AOD-WR daily.

      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

        #4
        Put the new gears in first and see what you think. I have 4.10's in mine which are fun, but I probably should have put 3.73's in. The WR + 3.55 might be nice.

        ~Adam

        '85 2-Door Crown Victoria
        302 HO, -0.022" E7 Heads, Weiand Dual Plane Intake, Edelbrock 1406 Carb, Mechanical Fuel Pump, HEI Distributor, 180* T-stat, Transgo Shift Kit, HO Governor, Lokar TV/Throttle Cable Setup, B&M Torq Master 2000 RPM Stall Converter, FRPP Trans Cooler, Mustang Shorty Headers, 2.25" Dual Exhaust, Flowtech H-pipe (no converters), Hooker AeroChamber Mufflers, Side-exit Exhaust w/ Chromed 2.5" Tips, '02 PI F/R Shocks, Cut 2004 PI Front Springs in the Rear, PI Rear Sway Bar, 17" SAP Wheels, 245/50/Z17 Michelin Pilot A/S Tires, Cold A/C, Cruise Control, 4.10 Rear End Gears, Trac Lok Diff.
        '04 Crown Victoria LX Sport, '02 Jeep Liberty
        '83 Suzuki GS 1100E Motorcycle[/color]

        Comment

          #5
          WR + 3.55 is nice. my car is actually more drivable now too. Less wonky shifting. (just installed 3.55L behind my WR AOD)

          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

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