1937-1957 Buick Oldsmobile Pontiac suspension upgrade
From Crankshaft Coalition Wiki
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==Overview== | ==Overview== | ||
A suspension and disc brake upgrade on a 1937-'57 Buick, Olds, or Pontiac (BOP) is complicated by many variables and side issues. In addition, there is little information on the topic, and few aftermarket parts are available. | A suspension and disc brake upgrade on a 1937-'57 Buick, Olds, or Pontiac (BOP) is complicated by many variables and side issues. In addition, there is little information on the topic, and few aftermarket parts are available. | ||
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Also, we do not have a '58 Olds available to check/measure the lower control arms. What we DO know is '57 is king pin, and '59 is all-new. So '58 is it. We used the '58 Pontiac upper control arms simply because we got the whole front end. Several uppers will work, as it looks like '58 to '60 BOPs all had the same basic dimensions on their upper control arms. In fact, the '58 Buick uppers we used on one conversion had some built-in twist that allowed us to add more anti-dive than we could get with the Pontiac uppers. | Also, we do not have a '58 Olds available to check/measure the lower control arms. What we DO know is '57 is king pin, and '59 is all-new. So '58 is it. We used the '58 Pontiac upper control arms simply because we got the whole front end. Several uppers will work, as it looks like '58 to '60 BOPs all had the same basic dimensions on their upper control arms. In fact, the '58 Buick uppers we used on one conversion had some built-in twist that allowed us to add more anti-dive than we could get with the Pontiac uppers. | ||
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| + | Updated addition- 1958 Olds lower arms are not symmetrical, and like Buick will not work. | ||
As you can see in the photos, the '58 control arms are more substantial than the '41. However, all the dimensions are the same. | As you can see in the photos, the '58 control arms are more substantial than the '41. However, all the dimensions are the same. | ||
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| − | For spindles, the '63 Pontiac spindles advised in the article were used.The '63 Pontiac spindle has a deep 90 degree bend at the bottom, to clear the wide corners on the lower control arm. (The '60s stock Chevy spindle has a 45 degree angle at that location, so Chevy Spindles won't work.) Unfortunately, when it was set it on the ground, the front ride height was too high. This led to a search for dropped spindles. | + | For spindles, the '63 Pontiac spindles advised in the article were used. |
| − | + | The '63 Pontiac spindle has a deep 90 degree bend at the bottom, to clear the wide corners on the lower control arm. (The '60s stock Chevy spindle has a 45 degree angle at that location, so Chevy Spindles won't work.) Unfortunately, when it was set it on the ground, the front ride height was too high. This led to a search for dropped spindles. | |
| − | For BOP, dropped spindles couldn't be found | + | For BOP, dropped spindles couldn't be found but Chevy drop spindles are readily available. |
| − | Chevy drop spindles are readily available. | + | |
| + | Note the side by side comparisons in the picture. | ||
{| | {| | ||
|[[image:63_pontiac_65_chevy_spindle_2.jpg|thumb|center|400px|Pontiac (bottom) vs. Chevy spindle shape]] | |[[image:63_pontiac_65_chevy_spindle_2.jpg|thumb|center|400px|Pontiac (bottom) vs. Chevy spindle shape]] | ||
|[[image:Cpp_-_Pont_-_chevy_spindles.jpg|thumb|center|400px|CPP custom spindle/Pontiac/Chevy]] | |[[image:Cpp_-_Pont_-_chevy_spindles.jpg|thumb|center|400px|CPP custom spindle/Pontiac/Chevy]] | ||
|} | |} | ||
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| + | The spindle on the left, shown above is the '65-'70 Chevy drop spindle from Classic Performance Products. It's their own in-house design and is very close to the design of a Pontiac spindle. | ||
| − | + | The ears had to be trimmed off the front side of the lower A-frame, but that was a minor modification. | |
[[image:IMGP0005.JPG|thumb|left|400px|Trimmed lower control arm]] <br style="clear:both"/> | [[image:IMGP0005.JPG|thumb|left|400px|Trimmed lower control arm]] <br style="clear:both"/> | ||
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[[Category:Suspension]] | [[Category:Suspension]] | ||
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