Hey all...very cool group here. I have a bit of a tech question and I'm hoping you current owners can help me out. I've recently purchased a "restored to factory" 1949 GMC 3/4 ton. Every component in it is again, restored to factory spec but the previous owner doesn't know what was used during the restoration. That being said, fluid equivalents has left me scratching my head a bit despite being very mechanically inclined. For example..."heavy duty hydraulic brake fluid" as was called in the factory service manual is what now? DOT3, 4 or 5? I'd guess 3 but not sure. Also...shock absorber oil...what type and weight? Hypoid gear oil for differential...80w90, 90w140? And even transmission...dont think it would take a hypoid oil but...what weight? The factory service manual states nothing other than "hypoid oil, or hyd brake fluid, etc". In many of the others...it's a 20W engine oil to lube pivots, and 50W for engine which is no issue. Any help or advice would be greatly appreciated.
