Close



Results 1 to 10 of 10

Thread: Rear end swap

  1. #1

    Default Rear end swap

    I have spent some time researching but have not gained the kind of understanding that gets through my thick skull. My car (85 conv.. converted to a V8 ) is running 4.11 gears in a transplanted 8.8 rear end. I have questioned all of the old hardcore gear heads around me, which is an admittedly small group as I live in rural Georgia. Everyone is telling me that the only people that they would trust to swap out a ring and pinion are either way way way too expensive, dead, or drunk and retired. That my best bet is to swap out the whole pumpkin with one that has the ratio that I want... 3.08 gears.
    I am pretty sure I can find someone to trade with me or to work out a deal with, but I have no knowledge whatsoever of rear end applications by vehicle.
    What kind of a rear end am I looking for? That is to say out of a pickup, out of a Mustang, out of an explorer, etc... in regards to the input and output areas.
    It is something that I have never had to learn thus far. I don't know enough to make a post about what im looking for.
    Educate me?
    Last edited by Toid; 02-17-2017 at 10:29 AM.

  2. #2

    Default

    What do you mean exactly by "swap out the whole pumpkin"? Do you mean swap the entire rear end out? That would certainly work but wouldn't be the smartest use of your time. And that also assumes whatever is in the new rear was done properly and is in good condition.
    If you mean swap out the whole differential (traction lock and gears) that is no help at all. That is what you "set up" when changing gears, at least one of the most important things you set up. The differential has to be shimmed in the axle housing and that is the most important of all. It keeps the gears from being burned up in 50 miles so swapping a differential is of absolutely no value at all.
    So assuming you mean the entire rear, the only "bolt in" units that are OEM that work are 1986-1993 5.0 Mustang and Capri. There was an 8.8 in the 1987-88 Fox Thunderbird, and Cougar (not all versions had the 8.8 ) that works and bolts in but the axles are longer, thereby moving the wheels further out from the fenders. So it would totally depend on your wheels whether that works or not. You would also gain rear disk brakes with that unit but then that opens a whole other can of worms trying to get all that working. The Lincoln Mark VII also had an 8.8 with disk brakes.
    Last edited by homer302; 02-17-2017 at 11:11 AM.
    Restoration of my 84 1/2 GT Turbo T Top:
    http://vb.foureyedpride.com/showthread.php?t=124724

  3. #3
    FEP Super Member bwguardian's Avatar
    Join Date
    Jul 2010
    Location
    Houston (Clear Lake), Texas
    Posts
    4,148

    Default

    I think what you are describing as changing out the pumpkin is how the old Ford 9" works. The third member separates from the housing and includes the ring & pinion gears and the driveshaft yoke. The Ford 8.8" is different and more like the typical rear end unit in that you have to set up the ring & pinion...or change out the whole rear end...
    HAD
    '82 GT monochromatic (red)...black cloth

    HAVE
    '85 GT vert two tone (white on charcoal)...white leather
    '00 F350 two tone (white on silver)...gray cloth
    '00 Excursion Limited two tone (white on tan)...tan leather...wifes ride
    '08 Taurus Limited ice blue...tan leather...daughter ride

  4. #4

    Default

    Quote Originally Posted by bwguardian View Post
    I think what you are describing as changing out the pumpkin is how the old Ford 9" works. The third member separates from the housing and includes the ring & pinion gears and the driveshaft yoke. The Ford 8.8" is different and more like the typical rear end unit in that you have to set up the ring & pinion...or change out the whole rear end...
    AHHH!! Bingo, we have a winner. I bet you are correct. As stated above, the 8.8 does not work like this. bwguardian for the win!
    Restoration of my 84 1/2 GT Turbo T Top:
    http://vb.foureyedpride.com/showthread.php?t=124724

  5. #5

    Default

    So I really need to find a good man and just replace my ring and pinion...

  6. #6

    Default

    If you want to drive 6 hours each way I know a good guy, LOL!
    Restoration of my 84 1/2 GT Turbo T Top:
    http://vb.foureyedpride.com/showthread.php?t=124724

  7. #7

    Default

    I got a guy who knows a guy... Who lives near a guy, nearby me. Races a lot of Foxes... It's likely he's got one (or five)... PLUS he likely wants mine.

  8. #8

    Default

    Too bad you are a long ways away. I have a 3.08 rearend and I want 4.10's.

    There has to be someone in your area in a similar situation. Or you can get the tag numbers for 3.08 rearends and find one in the local boneyard the sell your rearend with 4.10's. You'll get about double for it with those gears in it and ready to rock. Especially if you let them ride in your car and verify its good before you pull it.

  9. #9

    Default

    I'm barking up that tree as we speak!

  10. #10

    Default

    Good luck!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •