My indy came out of retirement and serviced both the 4.8is and the 4.4 today. new oil and filters etc. Reset engine adaptions and transfer case adaptions.
Swapped out the plastic gear to and new oil to the transfer case on the 4.8is. Big difference to the smoothness of the drive line... only down side is we found the cause of the drive line whine on throttle over run.... transfer case bearings are on the way out.... bugger...
Found the power steering leak on the 4.4. Gotta order in a new line and get some extra o rings for the vacuum pump and vanos solenoids then no more leaks....
Both driving much better. Worked out that with 4.8is off the road so much have only done around 2000km over the last 11 months....