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Is my frame bent?

Discussion in 'The Garage' started by K1Orion, Apr 29, 2003.

  1. K1Orion

    K1Orion 1/2 ton status

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    I posted this in the 73-91 forum also but I wanna work on this project today since I am off work and I need an answer.

    I just got a deal on a 79 GMC 1/2 ton. Its got a 350/465/205 and dana 44/12 bolt. The truck was rolled onto its side and has a bent rear shaft, smashed door and driver side fender.
    My question for the experts or anybody else with an opinion is:
    How can I tell if the frame is bent?
    Just looking at it it looks like the thing is doing the crab walk, but could it just be that the rearend is twisted in its u-bolts/mounts?
    Are there some measurements I can take to see if the frame is square?
    I want to use the 350/465/205 and would swap in my 44/14ff and lift in the new truck but if the frame is bent I will put the 350/465/205 in my old truck with the 3/4 axles and auto tranny. But I don't want to put axles under a tweaked frame.
    How can I tell if the frame is bent?
    AND
    Which would be easier motor/manualtrans/case swap into an auto truck or axle/lift swap?
    PLEASE help!!! /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/ears.gif
    thanx
     
  2. Sandman

    Sandman 3/4 ton status Author

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    If you can do this, one way is to measure from each corner to the opposite corner. Or from drivers front to passenger rear and vice versa. The measurements should be pretty close.
     
  3. K1Orion

    K1Orion 1/2 ton status

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    I thought about measuring corner to corner but that is impractical with anythging but a bare frame. I was wondering if any of the holes in the frame were placed with enough precision/accuracy from the factory to be used as reference points.
    If so, which holes?
     
  4. Sandman

    Sandman 3/4 ton status Author

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    I dont think any of the holes are standard. /forums/images/graemlins/tongue.gif

    Maybe you could hang some string off the ends or something.
     
  5. wadinator

    wadinator 1/2 ton status

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    /forums/images/graemlins/confused.gif /forums/images/graemlins/ears.gif
     
  6. georgiared84

    georgiared84 1/2 ton status

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    I hung big c clamps off the frame at identical points on the front and rear and measured the daigonal from the handles hanging down. That lets you know if it's bent side to side.
     

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