Outer Limits 4x4 Board

Hi All

This subject has been beaten. I did a search on the forum but I just wanted to check whether there are more than one generation of ZF4HP 22 that came out.

I am looking to do a swap on my Disco from manual to auto. Found an auto on a RRC 1990 and another off an RRC 1993....still looking to find a disco so I can get the whole package ( shifter and console...)

But is there any difference in gears, reliability and durability among the different year model that the ZF4HP22 came out ? is the stock cooler enough or more is recommended for off-road usage.


Thanks

Jay

Hey there mate i have just done a conversion on my RRC which is an 89 as far as i know there is only two types for RRC and disco one with and one without computer mine has no computer but my mates disco has, as for ratios etc. i couldnt answer. Yes i put a bit bigger cooler on mine as it will be doin quite a bit of bush hauling up hills bog holes etc cheap insurance.

Good luck with it all it is pretty heavy job AND DONT PULL THE BOX UP ON THE BOLTS UNLESS YOU ARE 100% SURE THE CONVERTER IS IN ALL THE WAY This caught me out and i had to pull it all out and replace the pump
Worth the headache though so much better in the bush

Thanks mate. I guess the other type of ZF4HP22 with a computer is the ZF4HP22H. But even the 4ZFHP22 came with different ending number that I believe have some difference in gear cuts.
I found this on the Aschcrfot website :
Common types of 4HP22 are, 332, 593, 699, 740, 741, 742, 744, 747, 748
The 4HP22EH or 4HP24EH will end in 061, 065, 727, 728, 759, 763, 764, 765, 766, 767, 768, 769

How is you rig now running compared to manual in the bushes and ditches ? What about engine breaking ? Is on road driving much slower and high revs ?

Thanks bro

ye went for bit of a trip last night and today bit of camping and little off road.
Realy noticed the difference in grunt and in fuel economy but dont think it is set up right yet as it is always labouring in overdrive and seems to change into it to early. Could be because of the 34" tyres but not sure will have to investigate further.
The offroadind is outstanding though and couldnt recomend it more though down hill especially in very slippy conditions is a bit hairy and i am still trying to learn the technique of driving it on the break but i am getting more and more used to it.It makes up hill in slippy crap a sinch just put it in second and let it chose the gear.
All in all pretty happy with it though.
Hope this helps. There is many other versions of this box in stuff like BMW and Jags and stuff but i am not sure of the exact differences involved with them.

Ashcrofts would be a pretty reliable source of info though and are quite reputable.

Good luck with it all
Damian

Damian

Do you feel it is slower on road ? Also do you have ABS.....with auto use to brakes doubles....any issues ? Heat build up ?
What Ring and Pinion ratio are you running ?

In slippery hill climbs you mean you are putting it in Low 2 ?

Ye i found it to be a little bit laggy compared to the manual but its the same with any car i did however put a bit more timing into it today when we went out to have play (only just got back good day) and it went heaps better and pulled quite nicely.
The breaks have got hot once but i really should have been in low range anyway but all in all no problems i dont have ABS so im of no use there.
I am still with the standard ratio gears but i think i will be changing them soon as i want to go to 36" tyres.
Ye low ratio 2 works realy good sometimes even 3 depending on how long the climb and how steep but generaly 2. It just uses the gear it wants full lazy man style.

Damo with your premature overdrive shift. Try adjusting the kick down cable so the little crimp on the cable isn't hard up against the outer sheath. The further away from the cable the quicker it'll kick down. Its a personal taste thing as to where exactly you like the kick down and overdrive shift point but once you have a pay with it it really wakes the trans (and car) up!

Interesting....I am looking at finding one in the junkyard.
What are the last 3 numbers on your gearbox....seems the one ending in 740 are the strongest according to Ashcroft. They came on the 4.2 RRC

How could the kick-down cable be adjusted ....just lenghtened ?

Also on hill climbs when you put the truck in D it tend to shift gears in the middle of the climbs....I guess you leave in 2 or 3

Cheers for that lucas i did have a play and adjusted that a bit but not much as i wasn,t sure how much you could go before stuffin it up guess i can keep goin little bit by little bit.
They just adjust like your accelorator cable to easy.
Ye i just let the box do its thing but still hold it in lower gears so as not to load it up to much.
Had a bit of straight line drag with me mates disco on way home (up to the limit anyway) his is 3.5 auto and mine 3.9 auto i didnt think that .4 of a litre could make so much difference mine just walked pass his but they seemed to shift down and up the same under hard acceleration so i must be close with adjustment to standard will have more of a play and get it to my liking.