C3 Service Manual Frame Dimension Drawing question.
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
C3 Service Manual Frame Dimension Drawing question.
Working on aligning the front A-arm attachment points for my C4 suspension transplant. There is a 1" hole on the stock front crossmember. How do I use this hole to determine the center of the front frame/suspension? The drawing shows the centerline intersecting the left edge of the hole. Do I go by the edge of the hole as the drawing suggests, or the center, which makes more sense to me, and just assume this drawing is another example of GM sloppiness?
Thanks for any definitive answers.
Mike
Thanks for any definitive answers.
Mike
Thread Starter
Tech Contributor
Joined: Jun 2004
Posts: 20,944
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
TT,
Thanks for the prompt reply. My original frame (currently still under the car) has this brake line hole there in the center, but my modified frame doesn't. I looked inside the cut-open crossmember, and don't see any evidence that the hole was ever there or was welded shut. The other two holes above and to the left and right are there, though. Unless I come up with any other ideas for locating the center, I may have to "wing it" the old fashioned way, I guess.
thanks again,
Mike
Thanks for the prompt reply. My original frame (currently still under the car) has this brake line hole there in the center, but my modified frame doesn't. I looked inside the cut-open crossmember, and don't see any evidence that the hole was ever there or was welded shut. The other two holes above and to the left and right are there, though. Unless I come up with any other ideas for locating the center, I may have to "wing it" the old fashioned way, I guess.
thanks again,
Mike
Thread Starter
Tech Contributor
Joined: Jun 2004
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
I can identify the center of my prototype crossmember/"subframe", but it's a bit fuzzy where the center of the GM frame is. The top of the original front crossmember is still attached, with the three holes I mentioned above (the one inch diameter hole, along with the two brake line attachment holes). I can get the subframe centered darn close just by making a whole bunch of measurements, but I was hoping there was a point on the frame that the factory used when assembling it in the welding jig during manufacturing.
