'57 Chevy P/u Kingpin Bushings - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-05-2010, 02:38 PM
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'57 Chevy P/u Kingpin Bushings

I ran across some specification information on my ol '57. It says that the 1/2 & 3/4 ton (3100 & 3200) trucks used a floating kingpin bushing. The 1 ton & up used a press fit bushing(pressed into steering knuckle).

All the kingpin sets I've seen have the usual instructions to press the bushings in. Then clearance to fit the kingpin with the proper bushing reamer or hone.

Question is, are the bushings on these old trucks supposed to float in the steering knuckle(spindle) as well as on the kingpin?

Are there any advantages or disadvantages to pressed or full floating?

Seems like it would be any easier job if they were floated. If the bushings were slip fit on the kingpin right out of the box, then you could hone the spindle with a brake cylinder hone to a slip fit and just assemble with grease. No expensive bushing reamers to purchase.

Am I missing something here? I helped a mechanic do a kingpin job on an old HD Ford truck many years ago and he had a full set of bushing reamers in different sizes. We pressed and reamed to fit. This was my only experience with kingpins.

Any opinions or comments welcomed. Thanks, olnolan.

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Old 06-05-2010, 05:11 PM
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Yes the early Chevy uses "floating" bushings. If everything is perfect. They go together well.... But, this being the real world.... It sometimes is a real Beatch to hold the bushings in place to hone for a pin...
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Old 06-06-2010, 08:59 AM
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Hey Bob, So I assume you're saying, even if I find NOS kingpin kits with bushings pre-fitted for the pins( if there is such a thing as pre-fitted). In the real world, it's not going to work? olnolan
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Old 06-06-2010, 08:06 PM
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They will work. But not without a little "tweaking"
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Old 06-07-2010, 08:01 AM
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Thanks Bob

Thanks for the reply Bob, I appreciate your input. I appreciate it even more considering it was the only reply. I thought there would be alot of older front end mechanics here with tons of kingpin experience to offer input. Apparently not. olnolan
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Old 06-07-2010, 08:41 AM
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I have done a couple of Datsun 521 trucks with kingpins. After pressing the new bushings into the spindle/knuckle, I took the new kingpin, and spindle/knuckle to a machine shop with a piston pin or upper con rod hone, and honed the bushings to fit.

The usual problem is getting the old kingpin to come out.
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Old 06-07-2010, 10:17 AM
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Hey Daniel, Thanks for the reply. When I discovered that the originals were supposed to be full floating it just got my curiosity up. If very little fitting is required on the full floating, then the job can be done in my shop without having to pay for outside work. Thanks again! olnolan
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