My 10 year old D Max seems to have a little bit of "slip" between gear changes, like clutch slip on a manual gearbox. In the old days they used to tighten the bands on autos, do they still do that?

Problem with auto trans is finding a competent workshop that can repair them, these days most

of the garages just want to replace instead of repair them.

The first thing to check with yours is the oil level or even better try replacing the oil and the filter inside

the gearbox if you know it hasn't been done in the 10 years of usage.

Band adjustment was never a cure for slippage. It was for smooth shifting. ie to eliminate the jerk.

Other thatn the other suggestions my guess would be to substitute a thicker oil.

Problem with auto trans is finding a competent workshop that can repair them, these days most

of the garages just want to replace instead of repair them.

The first thing to check with yours is the oil level or even better try replacing the oil and the filter inside

the gearbox if you know it hasn't been done in the 10 years of usage.

Very true. Most shops I've "visited" checked the transmission oil when the engine was off. hmmmm....

Check your oil level when the engine is idling.

There ain't a lot you can do other than change the fluid. Auto trans have clutch packs where the material on the plates is incredibly thin when one thinks the job the box does. The box also has it's own high pressure oil (fluid) pump which makes the thing work. Unlikely the pump, if material has been wiped off the plates it could cause your prob. Modern trans really are far more complicated than the old days, electronics etc.

Start the ride up to get things (fluid) moving, pull out the dip stick and dab the fluid on tissue paper, it should be pink in colour or perhaps heading towards red. Look in the fluid for minute particles of crap. If the fluid looks dark red or brown and/or crap then the plates are burned out or on the way.