retmil46 wrote:
Plus, we don't yet know what stall speed would work best with our engine, tranny, gearing, and tire size. Everyone keeps batting around 1500 rpm, but AFAIK that's still just an educated guess.
For that matter, Hughes Performance can rebuild your converter to their Fuel Miser model, 1000 to 1200 rpm stall speed.
As far as which stall speed is better, we don't know yet. Several people here on the list are going various routes to try and get some feedback on this.
What does look interesting is Suncoast's conversion kit to change the 545RFE to a 518 (48RE if I remember correctly). 48RE's are what they put behind a Cummins. And if their kit would allow you to use a 48RE torque converter, well, take your pick - seems like a gazillion aftermarket converters out there for this tranny, diesel apps included.
retmil46, I don't know exactly what RPM is right for the R428 mated to the 545RFE, however, as an educated guess I can't imagine that letting a diesel engine spin many hundred rpm PAST its peak torque can be a good thing. I understood that the more torque a diesel produces, the LOWER an rpm an auto TC could be set (judging from performance mods to Cummins, Powerstrokes and Duramaxes, this seems to be the case.)
Looking forward to how this develops, good info so far, retmil!
Cheers
Duey