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2002-2005 Range Rover MkIII / L322
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15 Posts
Discussion Starter #1
I recently purchased a 2003 L322 hse 4.4 v8 that was cheap, it’s been running ok but has now developed a thump or jump into first gear when hot. Runs fine after this but when I come to a stop it sort of hesitates then thumps back into 1st and away we go. Doesn’t do this at all while it’s cold just as soon as it gets warm or hot. It’s done 141k and had a gearbox service at 111k. Sort of stuck as to what to do next 😳

Thanks in advance

Jay
 

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LEGACY VENDOR
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2,316 Posts
Definitely worth checking that the upper valve body hasn't cracked in the usual place, allowing the hydraulic circuit between Shift Valve 1 (S-V 1) and the F-brake Valve (KV-F) to leak. This causes a loss of pressure in the A-clutch circuit, especially when hot (i.e. low fluid viscosity) resulting in the transmission ‘dropping into neutral’ when stationary in 1[SUP]st[/SUP] gear.







Phil
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter #3
Hi Phil, is this something I can do or is it down to a specialist? Want to try get it sorted as soon as possible. Seems like this is a common problem as I’ve looked through this forum and it’s mentioned quite a lot.

Cheers

Jay
 

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LEGACY VENDOR
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You’d certainly be able to check if the valve body is cracked yourself as it’s clearly visible without having to dismantle the valve body assembly.



Unfortunately, because the crack is in the upper valve block, you can’t inspect it with the valve body assembly in-situ and you need to drop the unit out of the sump. The procedure is covered in RAVE (44-15-52) and is very straightforward. Clearly, you’d need to replace the sump gasket and 5 litres of fluid (& ideally the filter, too) on re-assembly, even if this turns out not to be the issue.

You haven’t put your location in your signature.

Phil
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter #5
Sorry I know I’ve already been told off about it haha i will get round to sorting this but for some reason I can’t seem to do it on my phone! I’m based in Widnes just by Liverpool/Warrington. I have access to a ramp but just the time to sort is the issue 😞 i haven’t driven it since as I didn’t want to make it worse, what will eventually happen if I carry on driving it as it is? Just get worse? Knacker the transmission altogether? Sounds similar to the Jaguar v8 issues with that gearbox I bet it’s the same bloody box lol
 

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LEGACY VENDOR
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2,316 Posts
It’s not likely to get worse (unless a piece of the block actually breaks off) but will eventually wear the A-clutch.



This assumes of course that the diagnosis is correct – we’re just speculating at the moment, until it’s checked.

I always have fully-tested valve bodies in stock for the Range Rover (ZF 1058 127 350 model) and you’re less than an hour away from me so, if you do find an issue, let me know if I can help out.



Phil
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter #7
Fantastic! What a great help you have been, what do you charge for this? Yeah noticed that your in Blackburn which is not far so can always arrange something ��
 

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LEGACY VENDOR
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I charge £300 +VAT for a re-manufactured 5HP24 valve body assembly. I strip, clean & vacuum test the valve bodies (fitting a Sonnax replacement main pressure valve if required)

https://www.youtube.com/watch?v=54gBRA_yMnM

https://www.youtube.com/watch?v=jm_M4hk1YHI

https://www.youtube.com/watch?v=MZH3BkKlNfM

and finally each assembly is fully tested on a HydraTest machine.

https://www.youtube.com/watch?v=FU3KvO8zKlc

Low fluid level generally causes issues when the transmission is cold which may then disappear once it has warmed up (due to the drain-back and residence time of the fluid in the sump). Conversely, issues when the fluid is hot, which disappear when the fluid cools, are generally caused by leakage somewhere in a hydraulic circuit, the leakage being much worse when the fluid viscosity falls. If the leakage exceeds the capacity of the pump then the pressure will drop, and clutch slip is the result.

Phil
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter #10
Ok cool that sounds very reasonable to me 👍 how do I go about buying ones of these from you? Do you have a contact number I can call you on to arrange? Thanks again for all your help a Phil it’s been greatly appreciated 👍

Thanks again

Jay
 

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LEGACY VENDOR
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2,316 Posts
Clearly you need to check your existing valve body assembly first to establish if the upper block does indeed have a crack in it. If it does, then just send me a PM and I’ll send you my contact details. If there is no crack in it, we can discuss possible next steps.

Phil
 

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Discussion Starter #13
Hi Phil, sorry it’s been a while but I’m only just getting round to sorting this issue, I’ve got a decent diagnostic reader which reads trans codes and it’s come up with a gear sensor switch fault, it’s booked in with a trans company to do a thorough diagnostic but just wondering now if this could cause the issue?

Cheers
 
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