Mystery Rearend, Need Help

Discussion in '1947-1954' started by Flashlight, Mar 17, 2010.

  1. Flashlight

    Flashlight Member

    Joined:
    Apr 6, 2009
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    Location:
    Greeneville, Tennessee....Looking out over the Smo
    :(Hey Guys,

    I am finally able to get back to work on my 53' as the temp got to 50 degrees today in the shop:eek:. I was able to scrape some numbers off of the differential...AF 50?7...I think there should be a number in the third spot of the number but the factory stamp did not take.

    The donor 235 motor is from a 55-57. It is a 6 lug rearend with bendix brakes, open shaft model. So I'm guessing 55-62? Driving it definitely feels like a 4:11 or higher gearing.

    Any help would be appreciated as I would like to put some different gears in it and it does not have any of the parking brake components:mad:. Thanks

    Flashlight
     
    Flashlight, Mar 17, 2010
    #1
  2. Blueflame236

    Blueflame236 Member

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    Mar 29, 2008
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    Norway
    Rearend question

    Hey Flashlight

    I would make a phonecall to Patrick`s and talk to Patrick sr. This man knows a lot about the issue as he mostly works with swapping rearends/235 engines ect. on chevy trucks.
    My advice is to open the pancover and count the pignon and crownwheel teeths.Then you know the ratio ?
    Maybe there is some information to find at the rasto. pack site. GM has an information center to. http://chevy.oldcarmanualproject.com/chevyresto/ :D

    Good luck Martinius.

    http://www.patricksantiquecars.com/

     
    Last edited: Mar 18, 2010
    Blueflame236, Mar 18, 2010
    #2
  3. coilover

    coilover Member

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    You best find exactly what you have so you will know what to buy parts for like brakes and such but for the ratio just mark the pinion yoke, hold the axle still on one side and turn the one on the other side exactly TWO turns. The number of times the pinion yoke turns will be the ratio. Slightly over 4 turns will be a 4.11 and slightly less than 4 turns will be a 3.90.
     
    coilover, Mar 18, 2010
    #3
  4. vwnate1

    vwnate1 Member

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    Rearend Question

    Oh ~ I though you meant ~ nevermind :rolleyes: .

    If the rear axle is a GM product , remove the Derby Cover and look at the edge on the crown wheel and nose of the pinion as both will have the ratio stamped into them . along with part number and other info on the edge of the crown wheel .

    Jacking up one wheel and counting the driveshaft's turns is the correct way but I always like to see what kind of tooth wear pattern I'm dealing with and if you count the number of bolts holding the crownwheel onto the spool , most rear end shops will *instantly* know that it is you have and how much $ to up grade it etc. .
     
    vwnate1, Mar 21, 2010
    #4

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