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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2011 Posts: 60 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 60 | My 49 1/2 ton has knee action shocks. How can I test them to see if they need replaced or just rebuilt??
thanks!! | | | | | Joined: Feb 2008 Posts: 202 Shop Shark | | Shop Shark Joined: Feb 2008 Posts: 202 | Hi, billm, first check for oil leaks,then disconnect the link rod to the shock, now pull down on the link rod and it should be stiff, release the link rod and it should spring up. Next put the arm out of the shock at mid travel and move side to side to check for play. If it passes the tests. remove the shock and drain the oil to see if it has water in it, if not, good. On my shocks I drained out the old oil and refilled with 5wt Belray motorcycle fork oil. I had to make new cover gaskets out of 1/8" cork gasket. Have fun, Brian
Keep the 216's running. 1949 1/2 ton model #1314 (US 3104) Brian
| | | | | Joined: Aug 2011 Posts: 60 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 60 | | | | | | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | Be ready for 'sticker shock' if they are bad. Last I heard, they were around $200.00 to rebuild with good cores.
If someone knows where to get it done at a lower price, please tell us. I've got six of them laying in a corner of the shop.
Six volt guy living in a twelve volt world
| | | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | Don't have anything to add, just book marking this for future use.
The shocks on my 49 "seem" to work OK and at this point haven't been gone through yet. They are original to the truck and based on the stains on frame and inner fenders around them, they will need addressing sooner than later.
Brian, good info on servicing
beltfed, sticker shock I rekon.... | | | | | Joined: Oct 2008 Posts: 308 'Bolter | | 'Bolter Joined: Oct 2008 Posts: 308 | I drained mine years ago and refilled them with hydraulic jack oil. They actually work pretty well. Also, when testing them, be aware there were two types: single action and double action. The single action only damp in one direction - you pull against the damping force and when you release them they spring back. Double action damps in both directions. | | | | | Joined: Feb 2010 Posts: 86 Shop Shark | | Shop Shark Joined: Feb 2010 Posts: 86 | can you drain these knee action shocks on the car or do you have to remove first? I have a 39 | | |
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