Originally Posted by 454headache
Nope, that port above the rear servo port is the governor pressure port. That port would read would read 0 psi at idle and rise 1 psi for each 1 mph increase in speed. Even at 100 mph, it would be fare below my mainline pressure on this transmission, which in theory should have over 115 psi at idle.
It just doesn't make any sense how the accumulator port shows ZERO line pressure and the transmission is able to move the 6,500 lbs truck at all.
this is not a 727. this is a 47RE and has electronic governor controls. that pressure tap i mentioned is used to set tv pressure which should also be main line.
this is from PATC, its the best i can come up with for example. http://www.transmissioncenter.net/A5...ssure_Taps.jpg
here is the paragraph that explains it:
A 518 transmission has a throttle valve cable (pressure cable), it must be hooked up and adjusted correctly. You can get the cable and brackets from a junk yard. If you have a 727 transmission now this linkage may work. The correct adjustment on the T V cable or linkage is minimum throttle pressure at minimum throttle. In other words no slack in the cable at idle and it must start to pull immediately off of idle.
here is the link to PATC, they pretty much have everything you could ask for on a 518/46,47,and 48RE.
the info that i put up from the site is near the bottom of the page.