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Old 05-30-2006, 02:39 PM
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39 Pontiac Lower A arm pivot question

The part that bolts to the frame has threads. Both "A" ends thread to this part. When the A arm goes up and down with the wheel, the wear at these joints happens in these threads. There is grease zert thing etc. It would take lots of big words to discribe this set up. I hope somebody out there has seen this assembly, maybe answer this:

I see more threads sticking out on one side than the other. I think this is part of the caster adjustment, or effects caster. Does it? What difference would 1/8th make one way or the other? Not to worry? Or Freak Out?

Remember! This aint a Chevy, it's a Poncho! I have majorly burned bridges here dudes, got Fat Man lowered spindle supports, bent steering arms... now I need to put it all back together.....somehow.... ;-)

R

PS I hope to include a picture of the old stuff before I yanked it out.
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Old 06-26-2006, 09:43 PM
russlaferrera
 
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lower A frame

rwrther, There is a solid shaft that is threaded on both sides, that is bolted to the frame. The A frame is secured to the treaded ends, where they go up and down, they ride on bushings that are greased, (by zerk grease fittings). These bushings do not ride on the treaded part of the shaft, they turn within themselves. That why they are greased.

Unless the bushings are frozen or worn there should be no problem! Hope this makes sense to you, as it think it does to me. I am old and have a small brain that gets smaller every day.
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Old 06-29-2006, 04:58 PM
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lower A frame

I can't swear this is the caster adjustment for this car, but yes, tilting the lower A frame would affect caster. No reason to freak. could be anything. Longer bolt than the other, thicker washer, etc. there are only 2 things to worry about. Is it all tight, but not frozen and how does the car drive? Caster is what makes the handling. Think of a motorcyle front fork. Straight up and down it would have no self centering ability and be a twitchy ride, too much of an angle and it gets too springy and a ridiculous turning. the same principles apply. Any time you modify the front end, or ride height, or wheel offset, or tire sizes, get an alignment. Cheap price to pay for better handling.
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