Push starting an automatic car

[bullwinkle]

The 5 speed manual xB in my sig will do it-but I've never tried it with a dead battery.

 

[meep]

Chevy powerglide would roll start but I needed at least 20mph, maybe 25 to do it. Was eerie because it was silent and there was zero feedback. I just hoped at the bottom of the hill that the gas pedal would respond. Rolling a classic Chevy down a hill long enough to reach that speed, with the transmission holding it back, took a long, and steep, hill. Powerglides had both front and rear pumps on them iirc.

 

[hank2]

The pre 1965? Chrysler 727 Torqueflites had rear pumps and could be push or tow started.

 

[red7404]

yes hank is right 1965 was the last year Chrysler had a rear pump and could be push started. the funny car drag racers liked that . an other think i found was if going from P to R it banged hard. you need to pull the lever all the way LO first as that loaded the servo with 150 psi first. then when going to R it didint bang as hard. cause R loaded the servo with 300 psi.

 

[another Todd]

In order for an automatic to be push started, it needs to have a pump driven by the output shaft(s). Most modern automatics have their pump driven by the input shaft only and no output shaft pump is installed.

 

[George7941]

Are auto tranny oil pumps gear type pumps like engine oil pumps?

 

[red7404]

no. most trans oil pump are gerotor type. that push the oil in a smooth flow. most engine oil pumps have flat sharp gears the that make sharp pressure spikes. and tend to put air into the oil. and are noisy.