Thread: Disco 3/4 Automatic Transmission FAQ - 6 Speed

I bought an aftermarket drain plug kit, it works but not happy with it, so i’m gonna weld a 1/2” nut onto the outside of the pan next time it comes off and then just use the 1/2” bolt with a washer to plug her off...

Style - not quite following this as per the sump on a 6 speed.

Why do you need an aftermarket drain plug kit as the sump has a drain in it and the side of the gearbox has a filler plug.

Why do you need to weld stuff to it - plastic if original - cast aluminium alloy if a metal sump.

Sorry not understanding .

Garry

Originally Posted by Discovered 1 2

Sorry for the rant but i suggest thinking about it this way - would BMW, Jaguar, Ford, Aston Martin, Hyundai, Rolls Royce, Mercedes, Maserati, Kia, Bentley, VW, Audi and Landrover all be using or have used a variation of this box if it was a fragile, high maintenance POS? finicky, perhaps. Tough as nails if you treat it properly, IMO, my oath my friends ..

PS, draining the ATF fluid and a top up can be done with minimal tools, i think a 10mm socket and 2 allen keys, size dependant on the sump you have on, a cheap plastic oil pan and a tom thumb pump and a funnel (O and a towel that's fallen out of favour with SWMBO). Its a 4 stubby job if you drink quickly and can be done on a concrete slab with the suspension set at off road height.

STM TOM THUMB UTILITY PUMP

I use Fuchs 4134, it's supposedly the correct one for D4 and is used by heavier Mercedes applications, have found absolutely no reason to disagree. Burson's sell it.

This is just what I do but it works. Anyone wanting to take my 165k D4 SDV6 for test drive around the block to validate my theory is welcome within reason.

Hi Discovered 1 2, How long have you been using the Fuchs 4134 Trans oil and have do you use Dr Tranny as well?

Used it for 60 odd thousand ks in D3 and around the same in the D4 so far.. haven’t used Dr Tranny.

Originally Posted by garrycol

Style - not quite following this as per the sump on a 6 speed.

Why do you need an aftermarket drain plug kit as the sump has a drain in it and the side of the gearbox has a filler plug.

Why do you need to weld stuff to it - plastic if original - cast aluminium alloy if a metal sump.

Sorry not understanding .

Garry

Garry. There were 2 replacement metal sumps.
One with and one without a drain plug...

Had the dreaded E clutch bushing failure with a d4 3.0 last week. 200k old serviced at 150k and now faulting often. Looking at the 3.0 tt engine the trans looks no different to remove than the 2.7. In fact I am going to say easier as the starter is quicker to remove and the exhaust engine pipes are easy to access.

Jc

Originally Posted by Tombie

Garry. There were 2 replacement metal sumps.
One with and one without a drain plug...

If you get one without the drain plug then you got the wrong one.

When I first looked at getting mine, I looked on ebay and they did not have the drain plug so I checked with ZF in Sydney - according to ZF the LR one has the drain plug and the other one is for some other car that uses a sucker to get the oil out. ZF was much cheaper than Ebay so I got mine from them.

Cheers

Garry

All good my end Garry...

I got a dealer fitted metal sump, with the drain plug