TQ Converter for ZF4HP22 w/ TDi? - Defender Source
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  #1  
Old October 15th, 2016, 05:06 PM
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TQ Converter for ZF4HP22 w/ TDi?

Hello,

I have a worn ZF4HP22 that I plan on having rebuilt to go behind a HS 2.8 TGV (I also have a new kick down cam, governor, and valve body on the way from Ashcroft).

Optimally I would like to use Ashcroft's HP Torque Converter, but they are not available according to recent emails.

Looks like part numbers 36D52140C and STC3600 come up often as well as reference to the "Medium" converter, and "use the one from a 3.9"

Any opinions on the matter (I won't be putting a manual behind the 2.8 FYI)? Any sources to purchase the appropriate TQ converter?

Thanks,

Oscar

P.S. The engine and trans are in my garage. How do I separate the two?

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  #2  
Old October 15th, 2016, 06:00 PM
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Why are you rebuilding the ZF??



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  #3  
Old October 15th, 2016, 06:09 PM
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Wouldn't you need to change the valve body as well to accommodate the different torque curve and rev range?
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Old October 15th, 2016, 08:59 PM
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Quote:
Originally Posted by Rocky View Post
Wouldn't you need to change the valve body as well to accommodate the different torque curve and rev range?
Is the torque curve of the 2.8 that much different from a 2.5??

Quote:
Originally Posted by BlackField View Post

P.S. The engine and trans are in my garage. How do I separate the two?
Same as any other motor...unbolt the flywheel through the little access underneath(or the starter hole) and then unbolt the bellhousing from the motor.

Why do you think your ZF is worn out? These are very robust transmissions.


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  #5  
Old October 16th, 2016, 02:30 AM
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I test drove the eng/trans in a discovery and it was shifting hard, or not at all, shifts needed some jockeying of the selector to happen. I plan on keeping this for a while so its worth it for the peace of mind.
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  #6  
Old October 16th, 2016, 02:33 AM
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Ashcroft may be able just to ship you a valve body and torque converter for the 2.8 (probably the same stuff for the 300Tdi installed in the Disco 1 diesels).
All of the Zf4HP22's have the same gear ratios.
From what I know of them, there were only 3 different Zf torque converters made for various horse power applications.
This trany an go about 300K miles before the clutches are worn out.
Also, IF you change the ATF and it hasn't been done faithfully at each ~60K miles, an all clean fluid change will loosen fine particles and they will lodge in bad places & then you will need to rebuild it.
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Old October 16th, 2016, 04:16 AM
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Quote:
Originally Posted by Nomar View Post
Is the torque curve of the 2.8 that much different from a 2.5??


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I'm Assuming his ZF is from v8. If its from a Disco or RRC tdi, then I'd leave it as is. I'd certainly only rebuild it if the box was toast when he got it.
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Old October 16th, 2016, 09:26 AM
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ZF from a V8 disco. I've had 5 Discoveries, I want it to shift like they did, normal. I don't want to drive it in manumatic mode, I just want it to behave like an auto.
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  #9  
Old October 16th, 2016, 10:18 AM
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You cant use a V8 ZF behind a diesel...its all wrong.
Shift points are all different; ping Robert Davis.

I got a diesel ZF for my Tdi, changed the filter and it's been golden for 2+ years now.




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  #10  
Old October 16th, 2016, 12:32 PM
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Quote:
Originally Posted by BlackField View Post
ZF from a V8 disco. I've had 5 Discoveries, I want it to shift like they did, normal. I don't want to drive it in manumatic mode, I just want it to behave like an auto.
A Zf from a Disco1 is an HP22 the D2's (I think) are an HP24 & are electronically shifted. The shift points for the 300Tdi vs the V8's are about the same RPM range BUT what is different is the HP & torque input to the trany from the engine.

My 1985 BMW 524Td had the Zf4HP22 in it & I drove it over 25 years and it shifts in about the same spots as the Zf4HP22 behind my 300Tdi.

The difference in the valve body is the springs and their tension.
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  #11  
Old October 16th, 2016, 01:45 PM
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Quote:
Originally Posted by Nomar View Post
You cant use a V8 ZF behind a diesel...its all wrong.
Shift points are all different; ping Robert Davis.

I got a diesel ZF for my Tdi, changed the filter and it's been golden for 2+ years now.
I spoke to Robert about this and he suggested swapping the governor. Dave Ashcroft said I would also need a new valve body and kick down cam. As far as I know the the gear ratios are identical between diesel and petrol versions. The shift points are controlled by the valve body.

Viton,

Yup, ZFHP22 in D1s, ZFHP24s with Electronic control in the D2s. Did you put your 300TDi's HP22 together or did it come as a unit? Any idea what torque converter its running?
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  #12  
Old October 16th, 2016, 05:54 PM
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When I did mine with a factory LR re-power kit in the summer of '01, since the engine was new, I wanted a new Zf also. I had Frog's Island work with Ashcroft ( new Trany) & they put the it all together for me as the LR re-power kit was set up with a manual trany which some there kept.

The only issue I've ever had with mine is I did not use the right Loc-Tite on the bolt that holds in the trany output shaft when cause the governor body to move 1/2" and it wouldn't shift correct & I lost one of the seals (an O ring) the body sits on. Drove me crazy trying to figure out what the problem was.
Here's the thread
http://www.defendersource.com/forum/...tml#post453205
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