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Technical Rear end help

Discussion in 'Traditional Hot Rods' started by DFW31, Sep 10, 2014.

  1. DFW31
    Joined: Apr 13, 2013
    Posts: 148

    DFW31
    Member
    from Texas

    Ok, so a the rear end assembly that ended up in my car turned out to be less than adequate. It drives fantastic on the highway at 75-85 non problem. My problem is that when I'm in my coupe, I drive it hard bc that's why I got it.

    It has a Lincoln versai (sp?) rear end and the gear ratio is a sill 2.43 or something. I'm curious if there are a junk yard route that i can take to save a little cash. I'd really like to avoid spending 1200 on a complete new third member much less 3k on a full rear end. I've been told a mercury marauder would work but those aren't exactly everywhere.

    Hambers, help me out. The small block in my coupe dynode 535 and half of it is being wasted. In the words of Ricky bobby himself "I just wanna go fast"

    The car sounds so tough at a light and when I stomp on it, it falls FLAT on its face

    Please help a youngster moron out??


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  2. kuhn1941
    Joined: Feb 15, 2013
    Posts: 194

    kuhn1941
    Member

    Questions need to be answered ? What transmission and what tire size on rear axle , also what average speed your looking to do ? These answeres will help determine your ultimate goal .

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  3. big duece
    Joined: Jul 28, 2008
    Posts: 5,730

    big duece
    Member
    from kansas

    You can find any stock Ford 9 inch pumpkin with 3:50 or 3:70 gears, as long as it has the same spline count as your axles. Worst case, you may have to put new bearings and front seal. Just make sure you reuse the same shims on the front pinion support. 3:25's will still leave you at the light with the tires smoking too...
     
  4. Hnstray
    Joined: Aug 23, 2009
    Posts: 10,980

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    Your Lincoln Versailles rear end is almost certainly a 28 spline axle. Those are extremely common and usually found in passenger car applications. Pickups were more commonly 31 spline.

    Every swap meet I attend has at least two guys selling Ford 9" third members, usually they are asking from $150 to $400, depending if they are open carriers or Trac Loc.

    Ray
     
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  5. Yeah, based on dyno HP, if it's accurate, I would lean towards a 9" with 3.50-3.70 ratio and trac-lok for street reliability. BTW it's Lincoln Versaille.
     
  6. oldsman41
    Joined: Jun 25, 2010
    Posts: 1,134

    oldsman41
    Member

    ya didnt say what tranny your running but if its non overdrive your going to be up on the rpms if you go to low in the rear. if you dont care a 373 would do the trick. if you just want to stop light race a 411 would be great. no fuel mileage for sure. best of both worlds would be a od tranny and either of the rears 373 or 411.
     
  7. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 23,991

    Jalopy Joker
    Member

    post some pics - what exactly do when it falls flat on it's face? may be more a motor problem.
     
  8. GearheadsQCE
    Joined: Mar 23, 2011
    Posts: 2,253

    GearheadsQCE
    Member

    I have an OT shop truck with a 2.42 rear gear in it. Weighs more than 5,000 lbs. Stock 454 w/turbo 400 trans.
    It is no world beater but I can accelerate with traffic and it does not bog even pulling a trailer. My guess is that your 525 hp small block needs a high stall converter to get moving. You can change the rear gear to help your off the line performance but the top end will suffer. The solution is not a cheap junkyard parts fix. The other guys are right. the ideal solution is wide ratio trans with as many speeds as you can afford and match a rear gear to that.
     
  9. First, your Versailles rearend is just a 9-inch Ford with 28 spline axles. I have one in my 38 Chevy, and swapped in a 3.70 rear gear third member. I seem to remember my stock gear ratio in the Versailles rear was 2.75? Just get a complete (used, new, limited slip/locker - your choice for cost) replacement third member and swap that into your exisiting rearend.

    Second, I do agree with the other comments that you really need to have a matched system, and that means your torque converter should probably be a higher stall than stock if your engine really is 535 hp small block.

    Third, depending on your trans and intended use, that will help determine what new ratio is best for your car. For example, a 4.88 may be a lot of fun for accelerating, but will suck on the highway without some OD type trans. Just like your current ratio is too tall now. You need to have a matched combination of engine/converter/trans/rear.
     
  10. DFW31
    Joined: Apr 13, 2013
    Posts: 148

    DFW31
    Member
    from Texas

    Trans is is a turbo 400 with over drive. The motor is flawless, when I say it falls on its face I mean it just feels like there's un used power. The motor has a verified engine dyno of 535. I want to go 3.73 posi. The motor has about 1200 miles on it


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  11. kuhn1941
    Joined: Feb 15, 2013
    Posts: 194

    kuhn1941
    Member

    I'm all for fun , I also would lean towards a 3:55 gear - will give the car all around drivability . If you are a dragway person the 3:90 be a awesome performance choice . Good luck

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  12. nitro29
    Joined: May 26, 2005
    Posts: 66

    nitro29
    Member

    Hey, You have an overdive throw a set of 4.11 and a higher stall converter and have some Fun the overdrive will help with the mileage Roger
     
  13. This is a good combination. Most OT Jap cars have something like a 4.10 "rear" in them which is just about perfect with the OD. For stall, something like 2500 might be good.
     
  14. big duece
    Joined: Jul 28, 2008
    Posts: 5,730

    big duece
    Member
    from kansas

    What 400 turbo has an overdrive?? IS it a 700r4?
     
  15. 19Fordy
    Joined: May 17, 2003
    Posts: 6,562

    19Fordy
    Member

    Yes, the 700R4 has a .70 overdrive.
    I have been told that some years are better than others, but not sure why.
    Do some research.
     
  16. DFW31
    Joined: Apr 13, 2013
    Posts: 148

    DFW31
    Member
    from Texas

    I'm not exactly sure which 400 it is. I want to say its the 700.

    Is there any junkyard third members that I could use? Rear end and new third member prices are a little scary at the moment.


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  17. models916
    Joined: Apr 19, 2012
    Posts: 380

    models916
    Member

    700r4 from 89-92 and a few 93 are the ones to use. Induction hardened input shaft, forged 4 pinion planet assemblies, better timed clutch release and apply, more clutches in the 3-4 drum. improved oiling to the rear, 10 vane front pump, aux valve body, hardened sun shell etc....
    and.....if he has 500+ HP, he shouldn't be concerned about gas mileage. 3:43 - 4:11 with the OD and the lock up converter clutch should be fine.
     
  18. They shouldn't be that steep unless you want a posi. The lower ratio (numerically higher..) are best found in truck junkyards. The last one I got (4.30) came out of an old Econoline. We used open rears for the stock cars and installed spools.
     
  19. DFW31
    Joined: Apr 13, 2013
    Posts: 148

    DFW31
    Member
    from Texas

    Gas mileage is non existent. Lets say it's the opposite of efficient.


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  20. You can Google search gear ratio tire diameter calculators on

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  21. Online just plug in the overdrive ratio tire size and speed and it will give you the rpm. Takes the guesswork out

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