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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Dec 2004 Posts: 425 'Bolter | | 'Bolter Joined: Dec 2004 Posts: 425 | Anyone know exactly how much hydraulic oil to put in knee action shocks. I have a 49 3600. | | | | | Joined: Nov 2005 Posts: 49 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2005 Posts: 49 | Out of curiosity, I checked my 1940 manual which I would think as far as the shocks go would be close to the same. It says the shocks have to be checked and filled in the horizontal position thru the plug on top of the body which has the relief valve placed in this hole also. Says to fill to the top with GM Shock Insulating Fluid. Don't know if this stuff is available but motor cycle shops carry shock oil which might be just a 10, 22, or 32 weight hydraulic oil. Heavier the oil, the slower the rebound. Hope this helps.
Brian | | | | | Joined: Jul 2005 Posts: 29 Junior Member | | Junior Member Joined: Jul 2005 Posts: 29 | I'm working my way toward servicing the knee action shocks on my GMC FC-152 (3/4 ton). An old GMC serviceman in my antique auto club told me that GM shock fluid is no longer available and that motorcycle fork oil most closly subs for the original GM fluid.
Mike
'27 Chevy
'41 John Deere B
'49 GMC
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