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Old 10-29-2011, 06:27 PM
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47RE - 727 Mystery

After over ten thousand miles on a rebuild of 47re (same thing as 727 but with an overdrive) I spent some extra cash I had on hand on a pressure gauge to monitor line pressures while driving. Nothing wrong with the tranny, just wanted an extra gauge pretty much. Plugged it into the accumulator port, only to show no pressure at anytime.

Gauge checks out fine with air pressure. There is some fluid in the clear nylon line, but very little, looks similar to what an oil pressure gauge line looks like with the engine off (oil with plenty of air in between). Then I unplugged the line to see if any fluid would come out at idle. Not one drop came out. How is this possible? This truck should not run with any line pressure? When I rebuilt the transmission, I put a blocker rod in there, is that the cause? Is there any other way to monitor line pressure?
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