Quick Transmission Question

Hi
I always thought you could push start an automatic as long as you were going around 30mph or so ... Is this not true anymore? One person told me that sence about mid 60's you can't push start an automatic?? any fact to this??
Thank You
Tim

My 1970 restarts
My 1988 restarts
Either one though requires a good bit of speed (30 is fine)

More like the late 80's early 90's push the hell out of them and the tranny will not turn the Convertor....

the only one I know of that was designed to be pushstarted was anything that used an early Powerglide (GM) transmission. Many of them had a rear pump. Out put shaft turned the pump, pump supplied a little fluid to the converter and low gear servo and allowed push start capability. Later PG's did not have the rear pump.

Ford? Not sure. I can't see how they would have push start capability (speaking of a C4, C5, C6, AOD, etc). When teh engine is off, there is no hydraulic pressure so the converter is basically "dry"-relatively speaking. You need a converter full of fluid and a clutch engaged to make the engine turn over.

Matter of fact, speaking from experience....a C4 won't push start at all. I lost brakes at the end of a run once in my Mustang and killed the ignition to help slow it down. Once it lost pressure, it was freewheeling....luckily I was able to start it back up and pull it into low before I ended up in a chicken house.

Exactly.
The C4, C5, C6, AOD, TH400, TH350 will not push-dtart. they have no rear pump to give oil pressure. You can't even tow them for any distance because the driveline is turning the transmission and it will burn up the transmission due to lack of lubrication and cooling.

Ditto what PaulS said. Trans has to have a rear (governor) pump to build pressure to allow pull-starting.

OK Thanks for enlightening me.
tim

The old FORD-O-MATIC and CRUISE-O-MATICS had rear pumps that allowed them to be push started and towed. The rear pump was eliminated with the FMX redesign in 1968.

Originally Posted by pedal2themetal45

Hi
I always thought you could push start an automatic as long as you were going around 30mph or so ... Is this not true anymore? One person told me that sence about mid 60's you can't push start an automatic?? any fact to this??
Thank You
Tim

To push start you need a rear pump. Most automatics before 1968 had rear pumps and could be push started. About 1968 all rear pumps were history.

Ford 2-speeds had rear pumps & most cruisos did - C4 & C6 did not.
Early GM powerglides did but not the 350s & 400s.
Early Chrysler 904s & 727s did.

No transmission after 1967 had rear pumps that I know of.