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Old 11-17-2009, 03:52 PM
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Kingpins Tight

Anybody out there have experience with tube straight axles?I tryed to install my spindles on my axle and the king pins wont fit into the kingpin bosses on the axle.Should this be a slip fit or a press fit?I cant heat the axel because its powder coated. I had the kingpins in the freezer for a couple days at someones suggestion but it didnt help.

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Old 11-17-2009, 04:14 PM
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I don't know a lot about them, but it sounds like the bushings need to be reamed to the correct size......You are going to need to get everything measured and find out what the correct size needs to be.
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Old 11-17-2009, 04:24 PM
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Yes, spindles have to be fitted to the king pins. Either a reamer made for the purpose or honed on a long mandrel at a machine shop. I do a lot of them.
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Old 11-18-2009, 03:27 AM
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Kingpins Tight

there not tight in the spindles, there tight in the axel itself
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Old 11-18-2009, 04:06 AM
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Not unusual. The kingpins are a tight lubicated (neverseize) hand fit in the axle boss, something on the order 0f .0005 of less. If the boss is not perfectly clean and burr free, they just won't go in. Use piece of a 3M 120 grit Scotchbrite pad stapled to and wrapped around a piece of dowell stick as a hone to clean out any dirt, paint, burrs, bug chit or miscellaneous cat parts. Squeaky clean. If that doesn't do it, they will need to be reamed. Before you go off the deep end, be very certain you have the right pins. Measure the pins and the bores and if they aren't within a few (2 or 3) thousandths something is wrong. Do the pins fit the spindles? If so, remember that Ford pins are .813 and Chevy are .867, only .054 difference, but they won't interchange.
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Old 11-18-2009, 01:17 PM
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Kingpins Tight

Its less than .oo1 that the kingpins are too big.They fit the spindles fine.I dont have a micrometer only a dial caliper but the the king pins are definetly slightly bigger.
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Old 11-18-2009, 02:01 PM
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Kingpins Tight

Does anybody know where I could get the axle bosses reamed to size ? I guess this is part of the hot rod experience but im not enjoying it! $280 for the axel,$85 in powder coat $75 in brackets and who knows how many hours in fab and if someone cuts .001 to much ill be throwing it all away and starting again! Chris
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Old 11-18-2009, 02:39 PM
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Go to a truck shop and ask them....Large trucks still use straight axles and kingpins.......
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Old 11-18-2009, 04:12 PM
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You can try a wheel cylinder hone and slowly work them to size.
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Old 11-18-2009, 05:45 PM
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Whoa........

STOP.does the kingpin go into the tube axle? if so,youre good to go.theyre supposed to be fairely tight in the axle. thats why they have a tapered bolt,so the kingpin doesnt turn.if,the kingpin doesnt fit into the axle,you can use a small wheel cylinder hone,to take off a LITTLE metal from the axle,use plenty of oil on the hone. if its still way too tight,big truck shop or machine shop
should be able to help.

Last edited by boatbob2; 11-19-2009 at 07:41 AM.
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