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Thread: 1978 Grand Marquis

  1. #241
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
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    Progress! And I recognize the location of this picture.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning sometime in the 2020s, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  2. #242
    Member Grand1's Avatar
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    So getting there, I have never noticed, but us it normal for the back of my axle housing to look like an ass with a dimple?

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    1978 Grand Marquis 460 2door "Blue Bomber"

    1987 LTD Crown Vic 351w aka the "MI Mountie"

    1989 Colony Park ....Marge still lives!

    1979 Marquis creamy goodness

  3. #243
    Lost and driftin' Arquemann's Avatar
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    Somebody forgot to wipe I guess. And someone dinged your buttocks too, I wouldn't be too worried unless it leaks from the dent.
    1985 Mercury Grand Marquis LS, "Maisa"
    2008 BMW 530d Touring, "Femma"

  4. #244
    Member Grand1's Avatar
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    .... its wiped. Gonna have to really clean the housing of the shrapnel. Looks like axle shafts seem ok but there is a decent dent in the top, so might as well replace them.

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    1978 Grand Marquis 460 2door "Blue Bomber"

    1987 LTD Crown Vic 351w aka the "MI Mountie"

    1989 Colony Park ....Marge still lives!

    1979 Marquis creamy goodness

  5. #245
    Beater gonna beat sly's Avatar
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    wow... that's some carnage.

    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)
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    ... and it should all work like magic and unicorns and stuff.
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  6. #246
    Wagon Addicted Tiggie's Avatar
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    Wow. You gonna put new gears in that or get another pumpkin?
    1990 Country Squire - weekend cruiser, next project
    1988 Crown Vic LTD Wagon - waiting in the wings

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  7. #247
    Member Grand1's Avatar
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    New pumpkin..... with 3.70 gear , I can nab one for around $700 new.


    So looking at new 28 spline axle shafts, damn just about all of them are "cut to fit", so being that this is breaking my cherry on this axle..... are my axle shafts looking ok to reuse? The only thing I can see potentially wrong is that indentation/dent on the inside of the axle shaft (ok to reuse?) , ....or is it just the splines on the outside and how it mates that matters?
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    Last edited by Grand1; 05-01-2021 at 11:23 PM.



    1978 Grand Marquis 460 2door "Blue Bomber"

    1987 LTD Crown Vic 351w aka the "MI Mountie"

    1989 Colony Park ....Marge still lives!

    1979 Marquis creamy goodness

  8. #248
    Wagon Addicted Tiggie's Avatar
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    I think I'd run those axles. The axle bearings are sealed IIRC so they *should* be okay.
    1990 Country Squire - weekend cruiser, next project
    1988 Crown Vic LTD Wagon - waiting in the wings

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  9. #249
    GMN Regular DerekTheGreat's Avatar
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    3.70 without OD................
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

  10. #250
    Member Grand1's Avatar
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    I will bite, whats the best gearing for a C6 then?



    1978 Grand Marquis 460 2door "Blue Bomber"

    1987 LTD Crown Vic 351w aka the "MI Mountie"

    1989 Colony Park ....Marge still lives!

    1979 Marquis creamy goodness

  11. #251
    Wagon Addicted Tiggie's Avatar
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    Depends on your style and purpose. I like lazy loafer RPM on the highway. I'd run a 2.75-3.00, 3.25 max. Plus the sub 3.00 are usually cast offs from speed freaks and you can get them in good used shape ready to bolt in because so many pulled them out.

    If you are cruising stop light to stop light, you can go numerically higher.

    My 74 pickup has 3.73 with the C6 but a 31" tire. It's okay at 55. A couple hours at 75+ I'm certain it would shoot the rods out. Not a cruiser.
    1990 Country Squire - weekend cruiser, next project
    1988 Crown Vic LTD Wagon - waiting in the wings

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    Box Panther Horsepower and Torque Ratings
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  12. #252
    Member Grand1's Avatar
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    Thanks Tig, dont really care for highway driving in general and its a tenfold sentiment driving in the yacht. I get about 11 miles per gallon on a high grade gas no matter if I am idling or joy riding. Yes, I want speed, but not at the detriment of everything else. I want enough oomph to mess with the small, noisy shopping carts (insert honda civic / podbodies with the ugly spoliers) that tailgate and attempt to cut me off. A set of headers are en route from Ford Powertrain Applications and next year , some of the Mad Porters heads ala Reincarnation Automotive. So, I guess 3.5 or 3.25 (leaning towards 3.25)if I am understanding some of the info here.
    You ever mess with the transmission shift modulator valve to change shift points in that C6?



    1978 Grand Marquis 460 2door "Blue Bomber"

    1987 LTD Crown Vic 351w aka the "MI Mountie"

    1989 Colony Park ....Marge still lives!

    1979 Marquis creamy goodness

  13. #253
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
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    Axle shafts: I'm no expert, but I don't see anything that concerns me in those pictures.
    Rear gear ratio: definitely depends on what you want out of the car as far as what ratio to go with. You have plenty of other long trip/highway cruisers that get at least double the best MPG this car can get when configured for MPGs on its best day. My vote is for fun and on the rare long trip enjoy lower speeds for lower RPMs and/or back roads.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning sometime in the 2020s, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  14. #254
    GMN Regular DerekTheGreat's Avatar
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    What tiggie said.

    I figured you've got lots of long stretches of road out by you, so that it would be doing lots of cruising. I wouldn't be surprised to find out that Ashley's truck has tires which are about as tall as your car. It's got a 3.42 rear end in it, and in 4th gear (direct, same as your 3rd) it's winging 2000 rpm pretty early, like by 50 mpg. Even with OD, it's pushing about 2300 RPM at 70mph. So if you think it's a pig now on gas.. My vote would be 3.23, what does it have now, a 2.50ish? You'll definitely notice an improvement. I went from 2.73's to 3.23's in my Firebird and noticed something- it's much quicker stoplight to stoplight. Hurt highway MPG a bit- those 3rd gen's are known for really good MPG's, I was used to getting 24 with it, now it's down to 22 or so.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

  15. #255
    Wagon Addicted Tiggie's Avatar
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    Quote Originally Posted by Grand1 View Post
    Thanks Tig, dont really care for highway driving in general and its a tenfold sentiment driving in the yacht. I get about 11 miles per gallon on a high grade gas no matter if I am idling or joy riding. Yes, I want speed, but not at the detriment of everything else. I want enough oomph to mess with the small, noisy shopping carts (insert honda civic / podbodies with the ugly spoliers) that tailgate and attempt to cut me off. A set of headers are en route from Ford Powertrain Applications and next year , some of the Mad Porters heads ala Reincarnation Automotive. So, I guess 3.5 or 3.25 (leaning towards 3.25)if I am understanding some of the info here.
    You ever mess with the transmission shift modulator valve to change shift points in that C6?
    Haven't messed with it. The trans was rebuilt in the past and it's awesome. No idea why though since it's all a mystery inside. Shifts are always positive and quick. It does get to 3rd pretty quick under light throttle but will hold the gears if you put the hammer down. 3.25 to 3.50 sounds good for your purposes.
    1990 Country Squire - weekend cruiser, next project
    1988 Crown Vic LTD Wagon - waiting in the wings

    GMN Box Panther History
    Box Panther Horsepower and Torque Ratings
    Box Panther Production Numbers

  16. #256
    P31 Pursuit Car Brown_Muscle's Avatar
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    Holy cow with those gears... how did that happen?
    -Phil



    +1982 Ford LTD-S Police Car. 351w, GT40 Heads, Edelbrock 1906 Carb, Full exhaust headers to tails. 3.27 Trac-Lok Rear. Aluminum Police Driveshaft. Speedway Springs+Bilstein Shocks, Intermediate Brakes, Baumann Shift kit.

    +2003 Acura CL Type S 6-speed

  17. #257
    Member Grand1's Avatar
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    Peeled out on a country road, luckily by my house, but unluckly en route to get headers made for it last year. At first, I thought it was my flywheel as the sound was intense. Looks like a spider gear or other bearing went kaput and the ring gear shows the after effects. Third member will be here in about three weeks....went with a 3.5 with REM finished bearings for a total of $660 delivered....gonna rock my old axle input shafts.



    1978 Grand Marquis 460 2door "Blue Bomber"

    1987 LTD Crown Vic 351w aka the "MI Mountie"

    1989 Colony Park ....Marge still lives!

    1979 Marquis creamy goodness

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