P38 ZF 4HP22 interchangeability DSE/4.0?

Hello everyone,
I have a DSE with an automatic that is on it's way out. I'd like to rebuild the transmission, but I need the RR nearly daily. The thought was to do as I've done with other items before; buy a used unit and rebuild the original when I have time.

Prob is, there are 4.0 transmissions everywhere (=inexpensive) - but few DSE's. So does anyone have any experience with putting a 4.0 gearbox behind a DSE motor? I know the torque converter and the bellhousing need to be swapped - but how bout the rest?

Thanks
Steve

SteveMFr said:

Hello everyone,
I have a DSE with an automatic that is on it's way out. I'd like to rebuild the transmission, but I need the RR nearly daily. The thought was to do as I've done with other items before; buy a used unit and rebuild the original when I have time.

Prob is, there are 4.0 transmissions everywhere (=inexpensive) - but few DSE's. So does anyone have any experience with putting a 4.0 gearbox behind a DSE motor? I know the torque converter and the bellhousing need to be swapped - but how bout the rest?

Thanks
Steve

Click to expand...

Have a look at RAVE, or Ashcroft transmissions site. I have an idea that the overall length is slightly different.

The ratios will be different aswell.

All no longer important - got one. Thanks anyway, though.

BTW, the length is the same - it's the 4HP24 from the 4.6 that's longer.
The ratios... I would have thought there is a difference too. But check 'General specification data - automatic transmission' in the RAVE. There are the 2 gearboxes listed but only one set of ratios for all...

(a little unclear in this cut'n'paste - see the RAVE)

04 GENERAL SPECIFICATION DATA NEW RANGE ROVER
14 INFORMATION
AUTOMATIC TRANSMISSION

Automatic gearbox
Model
2.5 litre Diesel & 4.0 litre Petrol ZF4HP22 ...............................
4.6 litre Petrol ZF4HP24 ..........................................................
Type Four speed and reverse epicyclic gears with fluid .................................................................................
torque converter and lock up.
Transfer gearbox
Borg Warner Two speed reduction on main gearbox output, front .....................................................................
and rear drive permanently engaged via a centre
differential controlled by a Viscous unit giving a 50/50
nominal front and rear torque split.
Transfer gearbox ratios
High 1.216:1 ..................................................................................
Low 3.271:1 ..................................................................................
Automatic gearbox ratios
4th 0.728:1 ...........................................................................
3rd 1.000:1 ...........................................................................
2nd 1.480:1 ..........................................................................
1st 2.480:1 ...........................................................................
Reverse 2.086:1 ...................................................................
Overall ratio (final drive): High transfer Low transfer
4th 3.13:1 ........................................................................... 8.43:1
3rd 4.30:1 ........................................................................... 11.58:1
2nd 6.37:1 .......................................................................... 17.14:1
1st 10.67:1 ........................................................................... 28.72:1
Reverse 8.98:1 ................................................................... 24.15:1
Propeller shafts
Type:
Front Tubular 51mm diameter ........................................................................
Rear Tubular 51mm diameter ........................................................................
Universal joints Open type Hooks O3EHD .................................................................
Rear axle
Type Spiral bevel .................................................................................
Ratio 3.54:1 .................................................................................
Front axle
Type Spiral bevel .................................................................................
Ratio 3.54:1 .................................................................................