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Hi - does anyone know the difference between the H561 and H562 Hydramatic if any?


John

I may or may not be telling you something you already know but here goes.H561 were 3 speed Hydramatic autos fitted to EK's.H562 was a 4 speed Hydramatic fitted to EJ/EH.Internally they are different in some areas obviously because one is 3 speed and other 4 speed but do also share other internal parts as well.I've got an EK Hydramatic but don't have the 4 speed Hydramatic so don't know about external comparison but would assume they are similar if not the same externally.
EK Hydramatic ratios:
1st gear: 3.640:1
2nd gear: 1.580:1
3rd gear: 1.000:1

EJ/EH Hydramatic
1st gear:3.640:1
2nd gear:3.030:1
3rd gear:1.580:1
4th gear:1.000:1

All above written is from memory (except ratios which I looked up)so I may be wrong and could be corrected by a better expert.
Maybe someone else can correct me or add some additional.

Hope this info helps.....

Terry.

So an EK with a H562 is technically incorrect? Someone must have done a swap-a-roony on my car at some point.

Do you know anywhere in Sydney that does Hydramatic re-building/service. Was the H562 a 'better' transmission than the H561?

Did the US use either transmission? What was it called there? Anyone know?

Hi John. I'm not a great expert as I mentioned in my last post but the Hydramatics were considered a reasonably good trans in their early days but soon paled in comparison to trans that came later.They did use a fair bit of engine horsepower to run the trans itself and the fact that a standard grey is not overflowing with horsepower and the weight of the cars in addition to this made motor commentaters of the time give it a fair bit of bagging.
If you have the 4 speed auto then someone has done the swaparoomy on you as this is an EJ/EH Hydramatic.Not necessarely a bad thing though as I'd consider a 4 speed better to have than a 3 speed.
The US did use this trans and I can't find the bloody book of mine that lists which US cars ran this box so will leave this until a reply tommorrow when I find my book.As far as I know it was also call a Hydramatic over there as well.
Can't think of a Hydramatic rebuilder off the top of my head but maybe someone else can help on this one.

Terry.

Check with Sunny Tim as he knows a brilliant Hydramatic builder in Brisbane!
might even be worthwhile sending it up and having it fully rebuilt or he may have an exchange box,
It was up in Woollongabba if my memory is correct?
Cheers
Matt

Hi Guys.

The H562 Hydra-Matic was introduced partway thru the EK Series in March/April 1962.

There isn't much difference between the 2 boxes as there is still only 2 actual gearshift points. The ratios are calculated by using the effective torque converter ratio & some gears have the torque converter lock-up.


Dr Terry.

There you go John, if anyones going to know the answer Dr Terry will for sure!!!.I've learn't something here.I didn't know late Ek's had the 4 speed trans fitted.Is your EK a late build number? If so it seems the H562 in it may just be the original box then.

Terry (no not Dr Terry,I'm the other one)

Forgot to mention.I found my US Auto trans repair book but it only lists Turbo Hydramatic boxes,Alison,Powerglide,G.M.C powerflo etc.Not an early enough publication for Hydramatics.

Terry.

So was/is the H562 the same as the American designation of: RHM-240-62-H (Roto Hydramatic), which was a 4 speed unit of the same era.

Just thought someone might know.


John

Hi Guys.

Yes, that's same box.

Dr Terry