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| | | | Joined: Feb 2013 Posts: 250 'Bolter | | 'Bolter Joined: Feb 2013 Posts: 250 | On my '48 1 ton dually GMC I need to refresh the kingpins but I'm having problems finding repair parts.
My GMC maintenance manual lists the standard diameter as 0.9210-0.9214 and a length of 5-5/8"(5.625"). These are different dimensions from the Chevy 1tons which list the pins at 0.8660 x 5-3/16" (5.312"), though I can find a 9.210" sized set with a length of 5.125".
A parts search on RockAuto pulls up the same part numbers for both the GMC and the Chevy.
Will the 5.125" length pin work in place of the 5.312" one listed as the stock length?
Is my information on the pins and measurements correct?
Thanks! Jim
Last edited by Eureka Jim; 10/08/2016 10:30 PM.
| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | I hav not researched.... but I suspect an error in pin length.
I'm sure they are not hard to find and that same as the Chevy.
Buy the Chevy kit of the proper diameter and compare to your actual kingpins, I think you'll have a match. (Wouldn't hurt to check about returning if needed, my NAPA has no problems returning the wrong part if that's what it takes to find out for sure or find the right one.) | | | | | Joined: Feb 2013 Posts: 250 'Bolter | | 'Bolter Joined: Feb 2013 Posts: 250 | OK, here's what I found. The king pin in my axle was pulled and measured at 5-3/8" long by 0.921 in diameter, shorter than the 5-5/8" length listed in the factory GMC Maintenance Manual but longer than the one used by the Chevy at 5-1/8".
Looking through the Chevy Parts Manual I happened to see that the '53-'54 1 Tons used a different pin than the earlier models, listed with a length of 5-5/8".
I spoke with John at Jim Carter Truck Parts and he was kind enough to pull a '53-'54 king pin set, part# ME1742, and measure. 0.921 by 5-9/16". He measured the length with a tape so it might actually be the 5-5/8" length that was the original specification for the GMC.
Either way it was close enough to order. I'll update after the king pins are installed. Jim
| | | | | Joined: Jan 2015 Posts: 914 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 914 | Thanks for the update. Jeffrey | | | | | Joined: Feb 2013 Posts: 250 'Bolter | | 'Bolter Joined: Feb 2013 Posts: 250 | The new pins are installed. The machinist trimmed their length to 5-3/8", the same as the old pins that were removed.
I don't know what to think as I couldn't find any reference or any pins at the 5-3/8" length. It looked as though the factory spec of 5-5/8" was too long for the knuckle, so the pins were shortened to the most usable length.
The end result is a repair that is as good as the last time it was done--whenever that was---and a great improvement over the worn out mess I dropped off at the shop. Jim
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