jacckk
Active Member
Isn't the 4HP24 a four speed?
But anyway if your talking about the one that is used in the 4.6 range rover according to Datatek I think the box has slightly different dimensions somewhere but it is doable.
If you're talking about a box that wasn't in the range rover originally then yes I imagine you'll have lots of work to do as the gearbox ECU won't work with another type of gearbox and getting another ECU to talk to the BECM will be a complete pain.
But anyway if your talking about the one that is used in the 4.6 range rover according to Datatek I think the box has slightly different dimensions somewhere but it is doable.
If you're talking about a box that wasn't in the range rover originally then yes I imagine you'll have lots of work to do as the gearbox ECU won't work with another type of gearbox and getting another ECU to talk to the BECM will be a complete pain.
jacckk
Active Member
Yes I'm positive they didn't give the P38 a 5 speed automatic. A 5 speed manual, yes.
I'm sure the fact its named ZF4HP24 means it's four speed. All other ZF automatics are named ZF then the number of gears it has. The last number I have no idea about but I'd guess its something to do with the amount of torque it can handle or something.
I'm sure the fact its named ZF4HP24 means it's four speed. All other ZF automatics are named ZF then the number of gears it has. The last number I have no idea about but I'd guess its something to do with the amount of torque it can handle or something.
My 4.6 automatic is a 4 speed. I thought they all were too.
The ZF4HP24 is stronger than the ZF4HP22 to cope with the increased torque of the 4.6 engine. The gear change points and ratios might be a bit different, but the number of gears is still 4. It's also a bit longer.
I'm not sure how the extra length is accommodated, could be just different length drive shafts from the transfer box to the differentials, but I'm not sure.
You'd also need to change the gearbox ECU and maybe even tell the BECM too.
Not worth the effort to change over IMO. You're not going to get an extra gear.
The ZF4HP24 is stronger than the ZF4HP22 to cope with the increased torque of the 4.6 engine. The gear change points and ratios might be a bit different, but the number of gears is still 4. It's also a bit longer.
I'm not sure how the extra length is accommodated, could be just different length drive shafts from the transfer box to the differentials, but I'm not sure.
You'd also need to change the gearbox ECU and maybe even tell the BECM too.
Not worth the effort to change over IMO. You're not going to get an extra gear.
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Datatek
Well-Known Member
The 4.6 has the ZF4HP24 which is a 4 speed but stonger version of the HP22
It can be fitted to the diesel using the diesel bell housing and torque convertor, overall length is the same as there is and adaptor plate that accomodates the length difference although the 065 version of the HP24 is exactly the same length as the HP22 and uses the same adaptor plate. Change points are controlled by the ECU so will remain the same.
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I also think the OP gave up considering the thread is over 5 years old
Baiman
Member
Didnt seem quite so obvious to anyone other than you or I...
Grrrrrr
Technician, Bodgit & Scarper Ltd
Purely from an academic perspective I seem to remember the M51 engine went in the Vauxhall Omega. Now, I cannot remember if the 4-speed auto in it was the HP22 gearbox but I do remember the continental petrol autoboxes had the 5-speed version (or some did) and all the old grotty 4-speeds went to the UK market. I remember the box in the 3.0 petrol was stronger than the one on the oil burner and had a different ratio for the rear diff so that might have been the HP24.
I doubt if you can fit a later 5 speed box to a pre 1999 P38 maybe after 1999 but not sure. Even if you fit a HP 24 in place of a HP 22 to a vehicle prior to 1999, all you will get is a stronger box, you will not get the self diagnosis and adaptive adjustments the HP24 controller is capable of. Because it will have to run off the HP22 controller which does not have this facility. The HP24 controller needs CANBUS, pre 1999 models do not have this.
GM boxes Grrrrrrrrr.
Ar25 for the diesel and 2.0i petrol and the ar35 for the V6.3.0i. the ar25 was way to weak and the diesel would lunch it!!! The trick was to get the ar35 use the ar25 bell housing and shove it in the hole. You could even use the existing ECU.oh and both 4speed with the torque lockup.
Grrrrrr
Technician, Bodgit & Scarper Ltd
That was it! Yes, that would make sense. I remember a lot fo the oil burner guys chipping theirs and trashing their boxes.
