Was thinking that might be the best option, but hoping to get a better idea of what might be happening to try and explain to them, I will put a post up there if we don't get any luck hereGilbertd wrote:Disco 2 uses the same running gear as a P38 so a 4.0 litre would have a ZF4HP22 and a 4.6 would have the ZF4HP24 so you can ask away. In saying that, I'm not sure we even have any gearbox experts on there, they are a bit too much of a black art and magic. Your best bet would be to give Ashcrofts a bell and ask them, they are the experts when it comes to LR gearboxes. See http://www.ashcroft-transmissions.co.uk ... boxes.htmlBrian_H wrote:I'm not sure if Disco questions are allowed on rangerovers.pub?
He does, Luckly theres a bit of a big puddle between usLPGC wrote:Camaro seems determined to help, really full of spunk
What happens when it struggles to stay in 4th, Bri? Not just the torque converter locking / unlocking?
Its the first automatic I've driven for any significent amount so i've no idea on what the torque convertor locking feels like? Last auto I owned was an Escort with a CVT box about 10 years ago! Driven a couple since but not recently and only short term
It feels almost like a misfire - jerky motion to it, I'll be out in it tomorrow see if i can get a better description of whats going on. Also put the Nano on it and see if it finds anything though I'd suspect not.
I'd suspect a dirty valve is possible - most of the other maintenance thats been done on it by the previous owner seems to have caused more problems than fixed overall, Slowly working though the remaining ones I've found and the new ones that have decided to happen now (door locks being the current bugbear issue)camaro wrote:Lots of mentions of "governor valves" causing problems on those - one thread suggested holding it in second, and thrashing it for a while, to keep the revs nice and high - apparently this is meant to "clean" the valve - but a dirty valve is often just a symptom that you have more severe problems somewhere else in the box!
Also good to show your passenger why they should be wearing a seatbelt after they peels themselves off the windscreen!Gilbertd wrote:Dunno where you've found lots of mentions as they are normally nigh on bulletproof. Mine is at 329,600 miles and still on the original ZF4HP22 gearbox with no problems. Mine is ex-police and a guy I used to work with had previously been a fitter with the police. They loved the gearboxes on the P38 as they were so strong you could slam it into reverse at 70 mph if you wanted to stop very quickly without doing any damage.
Doesn't seem to be slipping more like its engaged and not getting power from the engine (literally like a misfire just without the popping that usually accompanies it). Can't see that i'd get a misfire only at that sort of speed though? Its had 2 new exhaust sensors and a set of plug leads to correct the original misfire (and tightened up the spark plugs that were barely finger tight while we were there!)LPGC wrote:Would think if it slips it points to a clutch problem, if it just doesn't want to stay in 4th but 4th works OK while it stays in that gear it points to a valve body type problem... unless it just doesn't like 4th because the engine isn't making enough torque so you have to put your foot down further to maintain speed (and didn't we think there was a problem with your engine)...