Disco 3/4 Automatic Transmission FAQ - 6 Speed

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Originally Posted by rar110

I should add to my post, that despite my failure and ZF's experience with the 6hp26 generally, this is a very well regarded transmission. It's fitted to Bentleys, Audis and BMWs. Here's a pic of the wear on output shaft on my transmission which resulted in the failure. It's reportedly popping up on RRV trannys, but not really known as a problem in D3/4s. The RRV & RRS tdv8 have a ZF/LR spec number unique to these vehicles. Maybe that is the reason.
Attachment 96424

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When I replaced my transmission on dissassembly we found that the input on the transfer case was worn as well as the trans output shaft. The cause of this was most likely fretting from a lack of lubrication when assembled. I needed a new transfer case as a result.

Regards,
Tote

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Originally Posted by Tote

When I replaced my transmission on dissassembly we found that the input on the transfer case was worn as well as the trans output shaft. The cause of this was most likely fretting from a lack of lubrication when assembled. I needed a new transfer case as a result. Regards, Tote

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Same here. I've bought a used transmission/transfer box. What year was your disco and how many km?

2008, it had 140,000ish on it when the trans was rebuilt.

Regards,
Tote

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Originally Posted by Tote

2008, it had 140,000ish on it when the trans was rebuilt. Regards, Tote

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Interesting. Mine is a 08MY, and the new box was from a late 2009 RRV. The tranny output shaft on the new box was lubricated.

Just finished changing the trans oil in my D3. Those front and rear row of bolts on the pan are a bastard - who thought it was a good idea to put chassis rails just below them - LR could have at least made it with enough room to get a T40 and ratchet in there. And I'd highly recommend getting the steel pan with a dump plug in it, unlike my steel pan that dosent have one. Makes for a messy job without it. Next time I do this job I'll be replacing it with a pan with a sump plug

Just changed mine as well, fitted the BMW steel pan with drain plug, I hear your pain!
Ended up making a rachet spanner tool for the bolts under the members.
It is the smallest rachet spanner in the cheap sets you get from Supa-Cheap or Repco.
Jammed a spare torx through the smallest rachet spanner hole (a little help from the angle grinder) and then cut off excess, worked a treat! By no means easy, but saved a lot of time.

-Wasa

An update for those of you who have a D3 - gearbox should NOT have computer update done if it is running well !! Which mine was - no-one told us not to ! We now have the beast at just over the 400,000km mark and all gears on flat ground are fantastic ! Working like a dream ! When I do my regular drive south I have 3 hills to go over - ping - gearbox failure on the kick back to increase the power to get over the top !!! Then it goes like a treasure again ! Seems that on hill climb and under pressure top gear will not go back to give me the extra power. Have the scanner installed as at today and will try the drive and remove code during the journey and see if the gearbox will slowly recognise that it can still do the good work !!! OMGosh - they should tell you these things !!!! Am determined this gearbox will hit 700,000km's as they know it can !!!!!:D Am going to keep smiling and avoid hills as it drives a dream on flat ground !!!! Happy travelling to all

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Originally Posted by LuvDisco

An update for those of you who have a D3 - gearbox should NOT have computer update done if it is running well !! Which mine was - no-one told us not to ! We now have the beast at just over the 400,000km mark and all gears on flat ground are fantastic ! Working like a dream ! When I do my regular drive south I have 3 hills to go over - ping - gearbox failure on the kick back to increase the power to get over the top !!! Then it goes like a treasure again ! Seems that on hill climb and under pressure top gear will not go back to give me the extra power. Have the scanner installed as at today and will try the drive and remove code during the journey and see if the gearbox will slowly recognise that it can still do the good work !!! OMGosh - they should tell you these things !!!! Am determined this gearbox will hit 700,000km's as they know it can !!!!!:D Am going to keep smiling and avoid hills as it drives a dream on flat ground !!!! Happy travelling to all

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Maybe transmission cooler needs a flush. It will be working harder up hills and be warming up. The cooler may not be working as well as it should.

Hi, it cost about $ 470.00 , It was cheaper than changing the pan to a steel one, and it was right on xmas time and I really needed the vehicle over the holiday season.

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Originally Posted by reidkiwigold

Hi, it cost about $ 470.00 , It was cheaper than changing the pan to a steel one, and it was right on xmas time and I really needed the vehicle over the holiday season.

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Hmm ... that includes the transmission fluid?

When I did a service on buying my demo D4 (the dealer I bought it from did not want to sell it to me after I paid the deposit), I had Brighton sell me a tongue and do a wheel alignment. It turned out the wheel alignment was way out on one wheel!!!

But I took it in and had an oil change (yes I two and am used to changing Toyota fluids seemingly all the time). They charged I think $185 for the motor oil itself ...