2006 LR3. I've seeing some fluid outside my garage on passengers side. Any common leaks? Also, the truck has 120k. The transmission is feeling jerky. I don't plan on touching the transmission fluid unless y'all suggest otherwise.

 

Certainly check the fluid level. If the jerky shifts turn into hard shifts I would start to worry. A common leak point is the harness sleeve. Its a fitting with o-rings that the harness goes through for the connector. The seals fail and it leaks. Replacement is not terrible but involves dropping the pan. If you still have the plastic factory pan most change to a metal pan at this time. New pan, fluid, sleeve, etc.

 

Check the electrical connector sleeve at the rear of the gearbox, as already mentioned above, it's a common fail point. If it's leaking you may as well plan to do an ATF change as the sump has to be removed to replace it. Then while you're at it 2 sachets of 'Dr Tranny' https://www.ebay.com/itm/DR-TRANNY-L...-/150510836237 with the final fill/level check.

I would suggest maybe doing a mega-flush on the gearbox, but if the fluid hasn't been change in 120K it might reveal the true state of the box, by cleaning off any crud between the clutch plates, resulting gear slipping. I took the chance on mine and had the flush done, afterwards the box felt much better and generally quieter. On the other hand I've read, on another forum, of some who've done it and found their box was knackered, but they where all 2.7Ds. I think the petrol (gas) engines aren't as hard on the gearboxes and we get away with it.