You need the Haynes manual, it's not too bad for the RRC either.
From the passenger side of the auto box you have 2 pipes that run alongside the sump to the front of the engine. Here they change into flexi hoses.
One goes to the front chassis crossmember and runs underneath then to one end of the hairy sausage. From the other end of that a pipe runs back under the chassis.
The other gearboc pipe and the return from the hairy sausage then go to the LH end on the engine rad on the 3.9. he engine rad pre-heats the gearbox oil when cold then helps to keep it below 100deg operating temp.
the system is fairly low pressure, my LSE has a 3rd oil cooler and it's fitted by cutting one of the metal pipes and clamping flexi-hoses to it for the kenlow oil cooler which sists under the chassis.
