Have my new (reman'ed is all that is available currently, so it is reman'ed) 545RFE fluid pump and am putting in some spring upgrades.
Newer style Mopar pump:
Older style pump would have a much larger raised hub here with integrated seal:
New style pump cover ("hubcap") with replaceable seal:
Pump disassembly:
Sonnax Line Pressure Booster Spring
Sonnax TC Accumulator Valve Spring location (left port in pic) :
I have two more decisions to make..the first being that the TransGo 45RFE-HD2 Reprogramming Kit comes with a tri-spring TC Accumulator Valve spring replacement, so i have to decide between the Sonnax upgraded single spring or the TransGo triple spring design. I called both companies and even the person at Sonnax agreed the load being spread over the 3 springs might help with longevity, but they were wondering if that changed the spring rate (increased it), and they said that would make for quicker and more noticeable TCC lock.
The stock Mopar TC Accumulator Valve Spring is a known weak point with documented breakages (been watching a ton of RFE teardown/rebuild videos from pro trans rebuilders and they all mention the issue). Sonnax chose to use upgraded spring material as that seemed to be the cause of the weakness/breakage.
The other decision is the TransGo kit comes with a different than OEM design TC Limit Valve. Apparently there is an earlier OEM and later OEM TC Limit Valve design. I am going to confirm I have the later design in this reman'ed pump, which will determine if the TransGo Limit Valve parts are needed (this is directly from TransGo when i spoke with them on phone).
Here is the TC Limit Valve as it came in the pump: