Pete, just wondered how you were getting on with removing the F-brake drum screws? I’ve just started stripping another transmission so I quickly filmed the screw removal with my phone (sorry about the quality). Firstly, using an air impact wrench : (easy huh?) and secondly with hand tools ...

If you’re after further entertainment once it’s stripped down, Pete, I can strongly recommend working out which part of the hydraulic circuit is fed by each worm track in the valve body assembly, and the function of every restrictor/orifice in the duct plate sheet. It’s difficult to imagine what...

Pete, The screws have a standard right-hand thread. In my posts on stripping the 5HP24 (e.g. http://www.fullfatrr.com/forum/post319415.html#319415) I recommend undoing these countersunk screws first, while all the weight of the transmission is still in it, and striking the screw heads a couple...

All looking good so far, Pete. I suspect the pitting marks are just porosity in the casing that’s been exposed when it was machined. Aren’t all 666 components in the 5HP24 an absolute joy to behold? Phil

If both 4th and 5th gears are slipping, as the codes suggest, it may well be an issue with the direct clutch possibly related to the infamous ‘toilet roll shaft’ failure, which transmits drive from the direct clutch hub to the epicyclic carrier Phil

Pete, You’d be very welcome to chuck your casings in my parts washer when you come back to get the clutch pistons removed. Phil

Goes without saying that all trainee 5HP24 rebuilders are required to generate a full measurement report for the clutch packs, bushes and end floats. I look forward to seeing it, Pete. Phil

Unfortunately, I don’t have any 260mm F38 converters in stock at the moment, only the 280mm L51 for the 4.6 M62 engine. More often than not the re-manufacturer doesn’t keep a stock of them either and they rely on rebuilding the actual unit that you send to them which they then return to you. I...

Your transmission came off the production line at Saarbrücken on 11th January 2004 so it has all the final upgrades including the ‘350’ valve body assembly and the ‘967’ F-brake piston. I have all the parts you need for the rebuild in stock. If you’d like me to put a quotation together just...

When the transmission was launched back in 1996 the only fluid authorised for the 5HP24 was Esso LT 71141. Exxon-Mobil subsequently re-branded this fluid as Mobil ATF LT 71141. ZF then decided it made commercial sense to start selling fluids badged under their own name so they got Pentosin in...

It’s just worn. The total movement of the LUC piston from fully on to fully off is only around 1 mm so it doesn’t take much wear in the friction plate for the problem to start. I drove mine for several thousand miles in this condition and when I eventually replaced it the friction plate looked...

I have very little personal experience of using K Motors but I haven’t heard any bad things about them. They used to re-manufacture their own transmissions but I don’t think they do any more. I know their parts division (LRDirect) is the main part of the business now, but the garage has been...

If you let me have the serial number off the green ID plate on the side of the casing I can tell you the date that the transmission was manufactured and therefore whether it had all the upgrades/modifications fitted. This may influence the parts that you need to buy. Phil

I suspect that more gratuitous photos of 5HP24 transmission internals is probably what’s needed here Pure filth! Phil

Yes, the Range Rover version of the 6HP26 has a LUC. Maybe EVC WinOLS and/or BitSoftware via chiptuningshop.co.uk might be a suitable starting point to investigate remapping? This is the LUC map for the 5HP24 generated using WinOLS : Also, Bill & Andrew Henney of BlueReach Automation in...

Increasing the engine torque from 440Nm to 600Nm necessitated a transmission upgrade to the 2nd generation ZF 6HP28 unit. The 2.7 had the 1st generation 6HP26. Phil

So your vehicle definitely had the front propshaft/final drive spline update as part of the Q041 service action? Phil

I really don’t think it’s as serious as that. Worst case scenario would be a replacement Mechatronic unit (coded to the vehicle) and these can be removed from the sump so there’s no need to remove the transmission from the vehicle. The 6HP26 is a pretty rugged and durable transmission so I...

You’ve added 3 x 6 litres = 18 litres, thrown away 8.8 litres (3.7 during the 2nd drain and 5.1 during the 3rd) leaving 9.2 litres in the transmission (i.e. 95% of its 9.7 litre capacity). Phil

Assuming 9.7 litres dry capacity & 6.0 litres refill, the proportion of new fluid in the transmission following each drain & refill is: 1. 61.9% 2. 85.5% 3. 94.5% 4. 97.9% So changing the fluid 3 times will give you 95% new fluid, but you’ve thrown away 8.8 litres of new fluid in the...