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

Originally Posted by Jturton

Hi all,
just had the transmission service at 106km on our D4, bit later than I'd hoped.
now the revs seem to lag and swim a bit in a few gears.
do I need to use my iid tool to reset the box so it learns the new fluid? How?
cheers

The manual requires a reset of the adaptations when servicing the box. It's located in the Service Test/Transmission/Clear Adaption. Reset the values and take the car for a drive.
No need to flog it, but allow it to shift under medium load & throttle. It may take a few drive cycles to settle itself down.
If you really want to geek out record the initial numbers before reset & see where they return to. They're arbitrary numbers as far as I can tell (i.e. the unit of measurement is elephants).

Out of interest has anyone attempted or even contemplated replacing their 6 speed with a later 8 speed?

Originally Posted by Jturton

Hi all,
just had the transmission service at 106km on our D4, bit later than I'd hoped.
now the revs seem to lag and swim a bit in a few gears.
do I need to use my iid tool to reset the box so it learns the new fluid? How?
cheers

Late to the party i know, but I intentionally didn't reset my transmission settings after reading about it messing up the gear changes.

The gearbox software modifies the shift points and whatnot as the box wears to minimise slippage and keep it performimg as expected. Apparently if enough wear has occurred and the box is reset, it forgets all of that learning, and then when its standard shift mapping is all slurry and sloppy, throws a fault saying the transmissions faulty.

As mine had fiest been done at 116k km and then 170k km i didnt want to risk it!

Did you ask you service guy/girl if they reset the gearbox software when they did it?

Originally Posted by Stuart02

Out of interest has anyone attempted or even contemplated replacing their 6 speed with a later 8 speed?

I have a feeling thats more hassle than its worth...

Yeah I figured if it was even slightly easy someone would have done it...

Originally Posted by Stuart02

Yeah I figured if it was even alightly easy someone woyld have done it...

There's enough nutters out there that like a challenge that even if it was somewhat possible someone may have tried it.

Some people stuffed a 2.7 TDV6 and 6 speed in a Discovery 1... that would drive nice

Originally Posted by Disco-tastic

Late to the party i know, but I intentionally didn't reset my transmission settings after reading about it messing up the gear changes.

The gearbox software modifies the shift points and whatnot as the box wears to minimise slippage and keep it performimg as expected. Apparently if enough wear has occurred and the box is reset, it forgets all of that learning, and then when its standard shift mapping is all slurry and sloppy, throws a fault saying the transmissions faulty.

As mine had fiest been done at 116k km and then 170k km i didnt want to risk it!

Did you ask you service guy/girl if they reset the gearbox software when they did it?

I reset my 240k km annually and it's fine. Shifts like **** initially but sorts itself quickly.

Originally Posted by DiscoJeffster

I reset my 240k km annually and it's fine. Shifts like **** initially but sorts itself quickly.

That is good to know.

When i was googling it i saw a few that had a bad experience and decided i wouldnt risk it, as it was shifting fine when i got it back from the transmission workshop (who intentionally didn't reset it)