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Technical Pinion angle

Discussion in 'Traditional Hot Rods' started by Beau9292, Oct 6, 2015.

  1. Beau9292
    Joined: May 24, 2015
    Posts: 9

    Beau9292

    Hey everyone, is it possible to set the pinion angle in the rear end without having a transmission or drive shaft yet? I am trying to install a triangulated 4 link set up on my 49 Chevy Styleline Deluxe and the pinion angle is confusing me. Any help is appreciated. Thanks!
     
  2. dumprat
    Joined: Dec 27, 2006
    Posts: 2,954

    dumprat
    ALLIANCE MEMBER
    from b.c.

    Short answer is no.
     
  3. Of course you can at least you can get it close enough for govt work. The car is going to settle a little bit with the transmission installed but not much depending on what you use for a transmission. The pinion should be parallel to the crank or the transmission tail shaft which will be parallel to the crank.
     
  4. 2racer
    Joined: Sep 1, 2011
    Posts: 960

    2racer
    Member

    3 degrees up is a good starting point
     

  5. treb11
    Joined: Jan 21, 2006
    Posts: 3,654

    treb11
    ALLIANCE MEMBER

    Your links should come with at least one end threaded. Get the fab close with setup, fine tune when all the parts are installed. You could possibly set the frame level, use a dummy / junk engine and trans (even just the crank flange) set at the final angle, then adjust the diff accordingly. Or just tack the 4-link brackets on and re-position later.
     
  6. Are your four link bars threaded ends? If so, you can adjust the pinion angle. The 3 degrees up is a good starting point, your trans output is likely to be a few degrees down.
     
  7. oj
    Joined: Jul 27, 2008
    Posts: 6,257

    oj
    Member

    Pinion angle is nearly the same angle as the intake manifold carb flange. If you are using OEM style intake it is about 3deg so the engine angles downward by 3deg to get the carb sitting level. Convention says pinion would go up at same angle. If you have aftermarket intake that is flat the engine would sit level so I'd tip the pinion down by a degree and let it go. If it is down when under power it'll come back level to match the engine.
     
  8. roundvalley
    Joined: Apr 10, 2005
    Posts: 1,773

    roundvalley
    Member

    All good advise. Just tack weld every thing. Easy to adjust later by cutting tacks.
     

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