My XJ is approaching 100k miles so I plan to do some preventative maintenance just to have a peace of mind. So far the plan is to do the following:
1) Replace plugs and coils
2) Replace plastic coolant tubes with aluminum
3) replace the rubber hangers for exhaust
4) probably crank pulley and sc pulley upgrade

my question is really what would yall recommend I add onto that list especially while I have the SC off to replace the coolant tubes

 

Looks good! Maybe add all the rubber cooling hoses?
After doing #4 you will question why you had not done it a long time ago! Don't forget the tune!
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Definitely replace/renew the water pump.
Renew both the SC coupler and SC oil.
Consider cleaning the intake ports and intake valves.
Consider renewing the PCV valves.

 

Addind above what i would do also if unknown when done or service interval reached:
- Change the transmission oil
- Change coolant
- Change brake fluid
- Change diff oil
- Inspect the rear axle CV joints and replace grease. (all four of them)

 

When you say SC coupler, are you referring to the plastic piece with the spring on it?

 

Thanks for all the recommendations. Gonna start stocking up all the parts to knock out everything at once.

 

Yep.