Evening All, A few weeks ago my car (l322 4.4 petrol, 2003) had a problem with the gearbox, basically in went in to safe mode
no warning from dash, long story short, i changed gearbox fluid, filter, both trans cooler hoses, trans cooler, trans cooler back plate, radiator & carried out the T-stat modification, car was running fine until last Sunday, on my way to fill up i hit the A47, took the car up to 60, went to over take another motor, kicked down, everything fine, then a bong from the dash trans fail prog flashed up then went out, a few seconds later trans message appears again then car bangs into 4th, couldn't move shifter into manual, just stuck in 4th, got the car home ( i had my icarsoft connected & recording, as my son wanted to borrow the car & i was just making sure everything was ok) the code that was thrown up was P0720. I reset the fault codes & took the car out again( recording data, drove about 6 miles) the car performed normally, no problems, after reading up on the Code it looks like the transfer box, so when i got home from work tonight i selected low gear car switched to low, after a few seconds the icon on the dash started to flash, drove backwards & forward a few times & icon stayed solid, then selected high gear, again car switched to high, done this a few times, worked every time. haven't a clue what caused the problem, has anyone any ideas? i'm going to paste the recorded data for the fault & the recorded data from tonight, hopefully some one could shine a light on the data & see something ive missed or if everything is running as it should
Frame 61/154:
Battery Voltage ----- 14.38V
Engine Speed ----- 2400rpm
Engine Temperature ----- 92°C
Gear Ratio ----- 5THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Oil Temperature ----- 69°C
Output Speed ----- 2912rpm
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 17mA
Throttle Valve ----- 36.88%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 5.05%
Turbine Speed ----- 2368rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 62/154:
Battery Voltage ----- 14.38V
Engine Speed ----- 3072rpm
Engine Temperature ----- 92°C
Gear Ratio ----- 4THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Oil Temperature ----- 69°C
Output Speed ----- 2976rpm
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 17mA
Throttle Valve ----- 25.24%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 99%
Turbine Speed ----- 2976rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 63/154:
Battery Voltage ----- 14.38V
Engine Speed ----- 2752rpm
Engine Temperature ----- 92°C
Gear Ratio ----- 4THGEAR
Gear Selector ----- D
Gearbox Operation ----- LIMP HOME
Oil Temperature ----- 70°C
Output Speed ----- 2880rpm
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 255mA
Throttle Valve ----- 12.42%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 99%
Turbine Speed ----- 2752rpm

This is the data from this evening
Frame 8/124:
Battery Voltage ----- 14.38V
Engine Speed ----- 1472rpm
Engine Temperature ----- 95°C
Front Left Wheel Speed ----- 14km/h
Front Right Wheel Speed ----- 7km/h
Gear Ratio ----- 1M
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 78°C
Output Speed ----- 192rpm
Rear Left Wheel Speed ----- 3km/h
Rear Right Wheel Speed ----- 4km/h
Shift Solenoid 1 ----- ON
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 16mA
Throttle Valve ----- 17.08%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 99%
Turbine Speed ----- 896rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 9/124:
Battery Voltage ----- 14.06V
Engine Speed ----- 1984rpm
Engine Temperature ----- 95°C
Front Left Wheel Speed ----- 36km/h
Front Right Wheel Speed ----- 19km/h
Gear Ratio ----- 2NDGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 78°C
Output Speed ----- 864rpm
Rear Left Wheel Speed ----- 15km/h
Rear Right Wheel Speed ----- 15km/h
Shift Solenoid 1 ----- ON
Shift Solenoid 2 ----- ON
Shift Solenoid 3 ----- OFF
System Pressure ----- 16mA
Throttle Valve ----- 39.21%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 99%
Turbine Speed ----- 1696rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 10/124:
Battery Voltage ----- 14.14V
Engine Speed ----- 2624rpm
Engine Temperature ----- 94°C
Front Left Wheel Speed ----- 56km/h
Front Right Wheel Speed ----- 28km/h
Gear Ratio ----- 3RDGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 79°C
Output Speed ----- 1472rpm
Rear Left Wheel Speed ----- 25km/h
Rear Right Wheel Speed ----- 25km/h
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- ON
Shift Solenoid 3 ----- OFF
System Pressure ----- 167mA
Throttle Valve ----- 42.71%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 99%
Turbine Speed ----- 1664rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 11/124:
Battery Voltage ----- 14.14V
Engine Speed ----- 1280rpm
Engine Temperature ----- 95°C
Front Left Wheel Speed ----- 50km/h
Front Right Wheel Speed ----- 25km/h
Gear Ratio ----- 4THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 79°C
Output Speed ----- 1696rpm
Rear Left Wheel Speed ----- 28km/h
Rear Right Wheel Speed ----- 28km/h
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 16mA
Throttle Valve ----- 0.39%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 54.35%
Turbine Speed ----- 1184rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 12/124:
Battery Voltage ----- 14.14V
Engine Speed ----- 1280rpm
Engine Temperature ----- 95°C
Front Left Wheel Speed ----- 52km/h
Front Right Wheel Speed ----- 26km/h
Gear Ratio ----- 5THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 79°C
Output Speed ----- 1472rpm
Rear Left Wheel Speed ----- 25km/h
Rear Right Wheel Speed ----- 25km/h
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 17mA
Throttle Valve ----- 35.72%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 47.75%
Turbine Speed ----- 1248rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 13/124:
Battery Voltage ----- 14.30V
Engine Speed ----- 736rpm
Engine Temperature ----- 96°C
Front Left Wheel Speed ----- 34km/h
Front Right Wheel Speed ----- 16km/h
Gear Ratio ----- 5THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 77°C
Output Speed ----- 1568rpm
Rear Left Wheel Speed ----- 26km/h
Rear Right Wheel Speed ----- 26km/h
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 17mA
Throttle Valve ----- 0%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 99%
Turbine Speed ----- 1120rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 14/124:
Battery Voltage ----- 14.14V
Engine Speed ----- 2272rpm
Engine Temperature ----- 97°C
Front Left Wheel Speed ----- 46km/h
Front Right Wheel Speed ----- 25km/h
Gear Ratio ----- 4THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 78°C
Output Speed ----- 992rpm
Rear Left Wheel Speed ----- 17km/h
Rear Right Wheel Speed ----- 18km/h
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- ON
Shift Solenoid 3 ----- OFF
System Pressure ----- 64mA
Throttle Valve ----- 53.96%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 99%
Turbine Speed ----- 1440rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 15/124:
Battery Voltage ----- 14.22V
Engine Speed ----- 2080rpm
Engine Temperature ----- 95°C
Front Left Wheel Speed ----- 68km/h
Front Right Wheel Speed ----- 34km/h
Gear Ratio ----- 4THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 77°C
Output Speed ----- 1824rpm
Rear Left Wheel Speed ----- 31km/h
Rear Right Wheel Speed ----- 31km/h
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- ON
Shift Solenoid 3 ----- OFF
System Pressure ----- 167mA
Throttle Valve ----- 30.28%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 54.74%
Turbine Speed ----- 1664rpm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Frame 16/124:
Battery Voltage ----- 14.14V
Engine Speed ----- 2016rpm
Engine Temperature ----- 95°C
Front Left Wheel Speed ----- 72km/h
Front Right Wheel Speed ----- 37km/h
Gear Ratio ----- 5THGEAR
Gear Selector ----- D
Gearbox Operation ----- NORMAL
Kick Down ----- NO
Oil Temperature ----- 78°C
Output Speed ----- 2080rpm
Rear Left Wheel Speed ----- 35km/h
Rear Right Wheel Speed ----- 35km/h
Shift Solenoid 1 ----- OFF
Shift Solenoid 2 ----- OFF
Shift Solenoid 3 ----- OFF
System Pressure ----- 17mA
Throttle Valve ----- 45.04%
Torque Converter Clutch ----- PASSIVE
Torque Converter Clutch ----- 41.54%
Turbine Speed ----- 1664rpm

Thanks for any information you can supply & or suggestions.
Regards
Tommo

Being a complete dumba** all I can can see are the wheel speeds are different with one being consistently double that of the other three.. ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

Hello Simon, thanks for your post, I agree, I'll get another sensor & fit, the thing is with regards to the data, is that I don't know if the TC readings are good bad or indifferent, the data I've pasted to the post is just a snap shot, there are over a hundred readings, all basically the same as the ones I've put on here, obviously they start on the initial start up, from 1st gear through to 5th gear, weather or not the problem is with the transfer box, I don't know, hence putting on here just to see if anyone could shed some light on the matter. It really was a bolt out of the blue, considering what i have replaced on the car, I even went so far as to book the car in with a auto box garage to diagnose/test, came back clear, no faults on the gearbox, only code that it threw up was a P0691, which is for engine cooling fan control fault, I'm hoping it was/is the transfer box, put it into high & low modes last night, went through ok, I'm going to try the calibration procedure tonight, see how it goes, the only other thing I can think of is maybe the trans fluid I put in, I searched on the internet & forums & Ravenol fluid had a few recommendations, so put that in, their web site said it meets/exceeds specifications, also changed the final stage resistor on Saturday, can't see that making any difference though. Anyway thanks for your interest.
Regards
Tommo

Probably worth a PM to RRPhil

https://www.fullfatrr.com/forum/member-rrphil.html

https://www.fullfatrr.com/forum/topic38676.html

Hello Alistair, thanks for the link, sent phil a pm last night, haven't had a reply back from him as yet, it's saying that the message is sitting in the outbox until its opened in the forum ? haven't a clue, will wait until its picked up.
regards
tommo

Evening all, carried out the transfer box calibration on Tuesday evening, the first run was ok, second run, a bit rough in lo gear, 3rd 4th 5th & 6th runs were fine, made all the difference when back in hi gear, drove to work & back today, drove normally, kick down worked fine, round trip of 120 miles, will use again for work tomorrow, fingers crossed all's well, hopefully it was the transfer box all along, lack of use?
regards
tommo