Solution for coasting an automatic transmission: external oil pump

[nascarnation]

Don't overfill - that makes more heat and cuts efficiency due to spin loss.

As for the add-on pump, it's feasible but make sure that it isn't a restriction to "normal" flow.

[Formula413]

Originally Posted by MetroMPG

Formula: I just noticed your user title and LOL'd! "I can has ecomodz?" Thanks for the chuckle.

You're welcome.

[bikin' Ed]

Has anyone done this yet? I really need to do something about the auto trans in my Dodge truck.

[vacationtime247]

Been putting my car in N coasting to stops for some time now. Mostly in my Escort but even been trying it in my wifes car the Alero. She gives me that 'what are you doing?' look. Way I figure it, an Escort tranny is cheap. Like @$250-$350 used from the recyclers. If it breaks, I'll do the repairs myself. Or perhaps become motivated enough to install a 5 speed! Tried EOC a few times instead of just N coast engine on but forgot to put in in neutral once. Won't do that again! Isn't the biggest concern a spike in pressure going from Drive into Neutral?
VT247

[zonker]

Originally Posted by bikin' Ed

Has anyone done this yet? I really need to do something about the auto trans in my Dodge truck.

something to think about if you have a 904 or 727 torqueflite tranny in your chrysler/dodge/plymouth...

previous to 1966, the torqueflite trans had two pumps, a front and a rear oil pump integrated into the rear of the trans. It was done for the specific purpose of preventing failures while being towed.

if you can find a good pre-66 torqueflite to rebuild, you could rebuild one of those and replace your later model 904 or 727 trans, and you'd be free to engine off coast to your hearts content.

[texanidiot25]

Originally Posted by aerohead

Question? If they can make a 100% electric lock-up torque-converter,can they make a 100% electric "unlocked"torque-converter,which allows the flywheel to "free-wheel"against the torque-converter? And could they unlock the transmission's tailshaft electromagnetically to allow the transaxle or differential to "free-wheel" eliminating the lubrication requirement for the auto-trans during "coast"?

I've never heard of a 100% electric TC, as opposed to the regular hydraulic, but you could try using electronic hubs like the 4x4s do. They disengage the axle shafts from the wheel in an effort to boost fuel economy. I think Ford used it for some time on the Explorer. Worth looking into, I suppose, but I don't know it's limitations as to when it can and can't be engaged.

[orange4boy]

Originally Posted by Andyman

One modification I would like is to have the torque converter clutch engage in all gears and to stay engaged even when using high loads. I don't understand why it couldn't be engaged whenever the transmission input shaft reaches a reasonable speed such as 1500 RPM. A lot of power is lost by letting the torque converter slip while climbing hills. Maybe the manufacturers are trying to extend the life of the clutch by using it only occasionally and only for light loads.

See: Freezing the Slushbox. Torque Converter on-demand lockup switch.