Ok thanks. Sounds like a job which is ideally done on a ramp. I wish i still had my workshop!!

thanks for that. Tempted to get a second hand box, fit the working valve block off that to mine rather than changing the whole box. Then have a play with my old valve block and see if i can see anything wrong. Worst case, the new valve block doesn't make a difference but its only cost me half a...

Mine also mate! So i am thinking the valve block is on the back of the box somewhere. Would that be right? If a can try and fix it for free i need to because i have only had it 6 months and it already stands me at well over what its worth.

I am time served in the nuclear sector and i am confident enough to tackle most things. could do with getting my hands on a manual for the box if such a thing exists.

is the valve block something that can be serviced with the box in the car or is it a full strip down job.

i have put some lucas oil in my box and it hasn't fixed the box but the gear changes are so much better. i am thinking of putting a 2nd hand box in the truck now. are all the boxes the same for the gems powered trucks? I have seen 4HP-22 or 4HP-24. i guess i need to get under my p38 and find the...

Seen that stuff at my local shop. i may give it a go this weekend. Just need to wait and see if the bloke who looked at it tonight is interested in buying it at the bargin price i want for it with the fault

Half thinking of giving that a go and then chopping it in against a td5 disco if it works. I have seen a few different versions of that lucas stuff though. i have seen one which is in a round bottle which looks like you squeeze it out. I have also seen sum wich is in the normal lucas shaped...

Apparently my box is flairing. I had a specialist look at it tonight. So it appears it is mechanical. I hold my hand up! Finally got my air bag light sorted out today and the abs light came on just before. its gone out again now though, so it looks like there is something else waiting to bite...

beg to differ!! if the fault was mechanical it would still be there in the same place!! A bit like having a dodgy spark plug and changing the coil. the fault wouldn't move!

it was free and i can't get hold of the right one from anywhere.

Depending on which ecu i use the fault is different but doesn't change while that ecu is fitted. my spare ecu isn't the correct part number but is for a 4.0. I will see if any fault codes show up tomorrow but with me swapping ecu's about there will prob be a list as long as my arm. I may go for...

Electronics are black magic! a mechanical problem doesn't change, once its there its there. my battery and alternator all work fine. voltages are as they should be. Its getting to the point where its going for a drive off a cliff never to be seen again! And get me a truck with a real gearbox!

Thats not always the case though untill something goes down completly it doesn't always show up .How would a mechanical fault change with a different ecu? its going for air bag light resetting tomorrow so i will get any codes read too.

I still have my fault but if i fit the spare ecu i have the fault moves down a set of gears. but you can change between 1,2 and 3 manualy fine. but as soon as you click it into d from 3 it selects 2nd then 3rd straight away before going up to 4th. but if you leave it in d it changes 1st to 2nd...

roughly 100 miles before i got the gas fault which caused this fault. i think i may go down the oil change route this weekend with some lucas in there for good measure.

I just put some atf stuff in it which met dextron 11D in spec. but i didn't know if any brand was favoured over others.

thanks for the reply. i did an oil change a few months back. i have ordered a second hand ecu to try. if this doesn't work i will do another oil and filter change. bed advice on what oil i should use?

My 4.0se has developed a fault after i had a miss fire while running on gas. The problem started after my gas has a miss fire under hard accelleration causing the box to shift up and down irraticly. Now the box has an issue when it changes to 4th. On the way up the gears when driving in D...

problem sorted = scrapped!!