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# ZF 4HP22 step by step.

- Thread starter WarrenL
- Start date May 25, 2013

#### corazon

##### Well-Known Member

May 11, 2019
#141
May 11, 2019
#141
Good news!
Still yet to test my setup but final spec will be 4.8 with edelbrock 500, strong ZF hybrid and 3.54 Jag LSD, should be a good combination by my calculations
U

#### unstable load

##### Well-Known Member

May 12, 2019
#142
May 12, 2019
#142
Off topic slightly, but I need some guidance...
I was given a 4HP22 out of a BMW 320 (E36 I think), it probably needs rebuilding because it ran with low oil level, but before I do that, it had a big electrical connector on the side meaning it has an ECU somewhere, my question is, is it a stand alone ECU or will it likely be integrated into the engine ECU as well? It had it's identification plate removed at some point, so I have no idea what actual model it is.
The master plan is to fit it to my P6 and for that it will need to be mechanically controlled, hence my question.
E

#### eightofthem

##### Member

May 12, 2019
#143
May 12, 2019
#143
Some pictures of the box would help, especially the connector ( does it have a kick down cable ) and is the selector arm on the right or left looking from the front?
U

#### unstable load

##### Well-Known Member

May 13, 2019
#144
May 13, 2019
#144
Here you go.. selector on right and no kickdown cable.
E

#### eightofthem

##### Member

May 13, 2019
#145
May 13, 2019
#145
Sadly that is not the 4HP22 or 4HP24
Looks more like a 5HP or later ( ecu controlled ) : (
I have plenty of 4HP 22 and 24 boxes if you need one. Non electronic
U

#### unstable load

##### Well-Known Member

May 14, 2019
#146
May 14, 2019
#146
Mmm, 5HP? OK, that's interesting.
Mind goes off at a tangent regarding possibilities.
Ta for the offer of a 4HP, but I am in Cape Town, so shipping will be a challenge...
P

#### PeterZRH

##### Well-Known Member

May 14, 2019
#147
May 14, 2019
#147
There is an electronic version of the 4HP. I wonder "how electronic" is actually is. I had it on my BMW e34 5 series. It had a "sport" and "normal" selector but didn't appear to drive much differently to any other auto apart from the shift points.
U

#### unstable load

##### Well-Known Member

May 15, 2019
#148
May 15, 2019
#148
PeterZRH said:
It had a "sport" and "normal" selector but didn't appear to drive much differently to any other auto apart from the shift points.
Click to expand...
That's probably the sum of it, really. And more efficient shifting /lockup, probably.
E

#### eightofthem

##### Member

May 15, 2019
#149
May 15, 2019
#149
PeterZRH said
"There is an electronic version of the 4HP. I wonder "how electronic" is actually is. I had it on my BMW e34 5 series. It had a "sport" and "normal" selector but didn't appear to drive much differently to any other auto apart from the shift points."
That's the early type Peter the first of the so called EH versions, the switch actuated a solenoid that made the shifts a bit harder, a bit of a sales gimmick rather than a fully electro hydraulic unit, the box would work with or without the switch connected as it's an " OFF " type.
The fully EH boxes need an ECU that feeds information from the engine management system to control exact shift points,
There is no governor only a speed sensor that returns a signal and the control unit is fully electro hydraulic operated so it will not perform at all without power.
E

#### eightofthem

##### Member

May 15, 2019
#150
May 15, 2019
#150
unstable load said:
Mmm, 5HP? OK, that's interesting.
Mind goes off at a tangent regarding possibilities.
Ta for the offer of a 4HP, but I am in Cape Town, so shipping will be a challenge...
Click to expand...
Yeah bit of a bummer that!, guess you need to keep looking, should be plenty out there for you.
U

#### unstable load

##### Well-Known Member

May 16, 2019
#151
May 16, 2019
#151
eightofthem said:
Yeah bit of a bummer that!, guess you need to keep looking, should be plenty out there for you.
Click to expand...
When I vet back home from work, I will be visiting a mate who knows the BMWs well to pick his brain about the box and it's electronics.
Who knows, maybe a 5HP may find it's way into the P6...
U

#### unstable load

##### Well-Known Member

Jun 6, 2019
#152
Jun 6, 2019
#152
unstable load said:
Here you go.. selector on right and no kickdown cable.
View attachment 13719
View attachment 13720
Click to expand...
So, it turns out it's a JATCO JR502E transmission.
Japan Auto Transmission Company.
5 speed electronic.
https://www.automaticchoice.com/en/t...sion-catalogue
Also used in some Nissans.
Jatco 5R01 transmission - Wikipedia
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