EK Auto

Includes clutch, transmission, propeller shaft,
universal joints, differential and rear axle.

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Gus58
Posts: 1
Joined: Mon Apr 18, 2016 10:25 pm
State: NSW
Location: 2680

EK Auto

Post by Gus58 »

I'm pretty sure years ago I saw in a Holden repair manual that EK's came out with a 4 speed auto option, can anyone confirm or discount this please?
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Harv
Posts: 5020
Joined: Mon Oct 08, 2007 2:00 pm
State: NSW
Location: Sydney, Australia

Re: EK Auto

Post by Harv »

G'day Gus,

Well this car could be systematic,
Hyyyyyyyyyyydramatic
Ultramatic

Why it could be Greased Lightning!

The EK Hydramatic has three gears, but the torus does some funky filling/draining that was sometimes advertised as four speeds.
More info here:
https://en.wikipedia.org/wiki/GM_Roto_H ... ansmission

Cheers,
Harv
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.
Dr Terry
Posts: 207
Joined: Sat May 21, 2005 6:41 pm
State: NSW
Location: Eastwood

Re: EK Auto

Post by Dr Terry »

I don't think that is was that simple Harv.

The way I read the various manuals & service bulletins is as follows:

When the EK was first released the Hydra-Matic was described as a '3-speed' automatic & was labelled the 'Type H561'.

Mid-way thru the EK production run (around April '62), the H561 became the '4-stage H562'.

It remained this way until the end of EH.

Having said that, I've never driven an H561 & an H562 side-by-side to feel the difference.

I've spoken to several old auto transmission technicians over the years & they say that the torus multiplication thing wasn't present in the earlier cars. Other than that I have nothing definitive.

Dr Terry
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