Low Stall Torque Converter?

[motcher41]

I have been doing some reading and found that it seems 4.0s had a low stall converter where the 2.9s had a high stall converter. For my non adventurous 4x4 fun type of driving wothy ranger it seems that there is only benefits to installing a low stall 4.0 converter in my 2.9/A4LD. A little torque power loss (pulling power under load or off reading power loss) but better acceleration, milage and reduced heat generation.
Has anyone done this?
How did it work out?
Like I said I'm not an off road enthusiast and the once or twice a year I even engage my 4wd is in the winter on ice roads.
I usually switch from my Focus to the Ranger in the winter months.

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[AllanD]

The torque converters are rather different, the 4.0 converter has more vanes on it's stator and rotor... but that is not entirely the whole story...

This is more a matter of the fact that the "stall speed" of a torque converter is not a fixed rpm, but depends on torque input...

As the 2.9 produces less torque relative to rpm than the 4.0 running a 4.0 converter
on a 2.9 engine, it will stall at a lower RPM than it will on a 4.0 engine

Yes the 4.0 converter will almost certainly do what you are asking it to do at lower rpm
and will likely the transmission will run cooler when off-roading and towing , but when just driving normally it will make the 2.9 seem a bit sluggish at times...


Remember that a torque converter acts like slight reduction gear when "slipping".

This is why they replaced simple fluid couplings

 

[motcher41]

Thank you! I suppose I don't want it to be more sluggish then the A4LD already is lol

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