Classic changing gearbox to ZF 4 hp 22

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
N

nick_2017

New Member
Posts
2
Location
plymouth
morning all I'm fairly new to the landrover world and have a question about upgrading my gearbox. I currently have a 3.5 efi V8 Range Rover classic fitted with a 4 speed and overdrive box. I want to change it to an auto or maybe a 5 speed box if I can. I have seen the ZF 4hp 22 yet I can't find an answer if its computable with my vehicle.

regards

nick
 
nick_2017 said:
morning all I'm fairly new to the landrover world and have a question about upgrading my gearbox. I currently have a 3.5 efi V8 Range Rover classic fitted with a 4 speed and overdrive box. I want to change it to an auto or maybe a 5 speed box if I can. I have seen the ZF 4hp 22 yet I can't find an answer if its computable with my vehicle.

regards

nick
Click to expand...

ZF 4HP 22 is electronically controlled so won't work in your car.
 
Not sure what the exact differences are but believe that it is the ZF4HP24EH that has electrical control and was used with 4WD, the ZF4HP22 is mechanical control and a common replacement for the BW35/65 in seventies classics i.e. Stag etc although there is a 4WD stag that uses the earlier box so assume it may be a power/load require meant that required the EH variant. Don't know if you can source the earlier box as they must be 40yrs old now
 
nick_2017 said:
morning all I'm fairly new to the landrover world and have a question about upgrading my gearbox. I currently have a 3.5 efi V8 Range Rover classic fitted with a 4 speed and overdrive box. I want to change it to an auto or maybe a 5 speed box if I can. I have seen the ZF 4hp 22 yet I can't find an answer if its computable with my vehicle.

regards

nick
Click to expand...

ZF4HP22 is fullly mechanically controlled - I have two. Plenty about in scrap D1's and scrap RRC's the 24 is a stronger box.... ( 22 can be upgraded to the 24 ) Electronically controlled versions of this box were fitted in the later D2's ( and others ) .... and could be fitted to your car, but you would need a compushift computer to control it....

I'd be having a word with Dave Ashcroft - his firm do kits for converting deafeners to auto:-

www.ashcroft-tranmissions.co.uk

Who also "do" the compushift 'puters :)
 
Henry_b said:
The 3spd Chrysler hydromatic was used on the early RRC

Chrysler Torqueflite, a solid 'box with military applications but not as efficient as the later ZF which was also used in the BMW 7 series. Installed in the RR classic the Chrysler required a different floor to accommodate it's size whereas the ZF didn't.
Out of interest what model year is your Classic? I don't know how important originality is to you (esp if the car is good condition) but you will lose that by retrofitting an auto which will also take the edge off the performance, such as it is !
Click to expand...
 
The Chrysler Torque Flight A727 3 speed was the first factory fit automatic in the RRC from around 1982
It was replaced around 1985 by the ZF4HP22 4 speed which was used to the end of the RRC.
The ZF isn't electronic - the only electrickery bit being the start inhibitor which will only allow you to start the engine if the selector is in 'P' or 'N'.
Mine's a 1986 3.5EFi & came with the ZF. I don't know if the ZF was factory fit to a carburettor engine.
I'm puzzled by your mention of a '4 speed plus overdrive' gearbox.
 
Last edited:
That's what's puzzling me.
I would expect the 3.5EFi to have an LT77 5-speed short stick manual box with LT230 transfer box or the ZF autobox with LT230 transfer box.
The LT95 has the integral transfer box & I believe was the usual candidate for the Fairey overdrive, but was factory fit to carb engines.
Perhaps the OP will enlighten us.
 
You must log in or register to reply here.

Similar threads

I
L322 Could anyone help with 2005 RR HSE fluids questions?
Replies
0
Views
280
invisible999
I
E
Auto gearbox woes
Replies
3
Views
431
sierrafery
sierrafery
C
Gearbox fragments
Replies
9
Views
352
steve2286w
steve2286w
B
L322 Range Rover l322 gearbox issue
2
Replies
24
Views
3K
rich28uk
rich28uk
F
Gearbox selector issue
Replies
2
Views
467
Datatek
Datatek
Back
Top