Quote:
Originally Posted by gerfunken
Ok, looking for a little bit of assistance in trying to figure out the O/D for a 47RH transmission. The only diagram I've really found is this:
What I'm trying to determine is the best way to hook up the transmission so that I can continue to have overdrive. It doesn't feel like I'm understanding what they're documenting in sites like
THIS
From reading the components, it seems that I need to install two A/C switches (one for 44 PSI, one for 52 PSI) on the #4 governor pressure port (upper left in this picture)
It also provides a warning that "The figures on the pressure switch will only be correct if you have a stock tire size and rear end ratio.", so how does this change if I'm running 35" tires (315/75r16)?
I'm kind of lost on this one, and looking for a little bit of help... |
there are more than one ways to hook stuff up. the PATC write up is for a gas engine(thus the use of manifold vacuum) you can just run a toggle for the TCC and OD on the dash and switch them manually when you want either to happen. that would get old.
using the line pressure and a pressure switch is what the PATC write up is about. line pressure in the 47rh is determined by the governor speed therefore your vehicle speed. so a bigger tire will mean you reach 44 mph before you reach 44 psi in line pressure.
you can use the factory dodge ECM and hook it up as it was in the dodge and it will control your shifting in and out of OD as well as the TCC. it will also do your voltage regulation and time out on the grid heaters.
since you dont have a load based source of vacuum, if you eliminate the ECM and use the pressure on the govenor port witch switches, you will have to find a way to switch the TCC off, and OD off when you are under heavy throttle at speed. that would be done i think with the voltage comping out of the TPS, but im not sure how you would set that up. or you can use a micro switch(s) on the throttle linkage somewhere to break the circuit at a certain throttle input so it will kick out of lock up and or OD. im not sure how that would work, as i quit researching after i bailed on the auto.
i am sure Ryan or Nick may have better ideas as they have actually completed this swap before
Ryan