Re: oil relief valve
Slick I would try a 5/16" shim and see what happens. The spring may be so weak the pressure is still moving the spring and dumping oil causeing a pressure drop. If the pressure don't rise with the 5/16" spacer then the oil pressure is dropping do to wear or if the oil pump is the later type with a pressure relief valve that is dumping and needs a shim. The gears get all the oil they need even if the valve NEVER opens from the flat spots on the valve. G.M.
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