lock-up clutch 2004 D2

[German Gruner]

I define myself as a newbie with automatic gearboxes, because I made the most of my driving with manual gearboxes.
Recently I did a trip with my TD5 auto D2 and suffered from a gearbox temp light when doing great slopes with great height. This is, from 2400 meters to 4300 meters, for instance. I understand that this temperature is coming from the torque converter.
I´m afraid that Td5 engine was not able to do the work in direct drive, so I did select "3" to force it to drive at more than 2200RPM.
Here comes my question: If lower speeds are selected: does ZF gearbox connect its lock-up clutch? Or this is only a "direct speed device"?
(Scuse me for my eventual spelling errors)

Thanks in advance & Regards

 

[Harv]

I read somewhere that they only lock up in D, but both my D2 and P38 lock up in 3rd as well.
I don't know much about diesels, but with petrol engines i think shifting down manually while climing hills is a really good idea. The higher RPM is probably good for transmission cooling as well.

 

[Swedjen2]

The last time Rover imported diesels into the U.S. was when the Beatles were on the Ed Sullivan show. A really big show.

 

[German Gruner]

1964, I was born that year...
But I'm lucky because my Td5 is a little bit newer, haha!

 

[Harv]

I didn't think any diesels were ever brought into NA by Land Rover. I thought the only diesels here were either imported or converted. (My 2A is 1963)