FYI:
Not all 05 & 06's came with a Limited Slip differential!
My 2005 Limited and did not have one from the factory!
I have a new Auburn LS unit and all bearings ready to install in the coming days.
Below is a list supplied to a couple of other requester's on LOST previously, it certainly is not all inclusive, but a good basic list of possibilities to consider in order to "Bulletproof" a Jeep Liberty CRD... Searching on this forum, you can find informational threads on most all of these items listed below along with 'how to' instructions... If you have any questions or concerns on any of the items just ask, there are many great, experienced, and knowledgeable people on this forum more than willing to help, offer advice, or answer any question no matter how trivial you may have....
**Timing belt replacement should be number one if you have not done it or know if and / or when it was last done! Replace the water pump as well when replacing the timing belt...
A broken timing belt can cause catastrophic damage as this is an interference engine and repairs can get very expensive when considering replacement costs of damaged parts and labor... If yours has been done recently, disregard this.
Some good updates and mods worth considering as time and monies allow:1. **Replace timing belt /water pump (read above)
2. Install In-tank fuel pump (eliminates all air in fuel problems)>
http://www.auerbach.ca/kj/lift_pump/3. Install ProVent on CCV system (gets the oil out of the turbo inlet hose, turbo, boost hoses, and CAC)
4. Install Secondary 2 micron fuel filter (protects expensive CP3 fuel injection pump and expensive fuel injectors)>
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=98&t=80139&hilit5. Install Silicone Boots Hoses
6. *Install Weeks elbow kit (removes EGR, EGR cooler, and FCV) >
https://shop.sasquatchparts.com/products/egr-delete-jeep-liberty-crd/ See item #8
7. Upgrade torque converter to Hemi or SunCoast TC
(solves and TC shudder issues if installing performance tunes) [install new front pump assembly in transmission while you have transmission out to install new TC]8. DIY performance TUNE ($0 cost and available on this list in the CRD Tech section) >
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=98&t=78418......{a must do if you install the Weeks elbow kit to eliminate DTC's (check engine light) that will be present when you remove the EGR & FCV)
9. *Remove CAT & choke point and put in straight piece of pipe (improves exhaust gas flow, lowers backpressure on turbo and improves turbo spool up response time)
10. *Replace muffler with straight through performance muffler (same improvements as item #9)
11. Rear shocks (You did not mention replacing them in your post!) {upgrade tires if needed}
12. Check / replace upper and lower ball joints if needed, they wear out and can separate
13. Service transmission, replace filters & fluid
(use only ATF+4 transmission fluid)14. Install Magnefine in-line transmission fluid filter (filters and traps all micro fine metal particles and can be serviced without dropping transmission pan)>
http://magnefinefilters.com/Magnefine-3-8-Magnetic-Inline-Transmission-Filter-R038M.htm15. Change engine oil / filter (install larger better quality filter and a use full synthetic 5W-40 oil like Mobil 1 Turbo Diesel Oil)
16. ^Replace: engine head bolts with ARP studs, rockers arms, and exhaust valves
(ex. valves can break) {^proactive engine failure prevention}17. They may be a few other good mods that members can suggest, but this is a good start!
-Some parts can be expensive & doing all these mods can take time!!! *Removal of the CAT and EGR valve totally may not be possible depending on your location and whether or not your vehicle has to endure an inspection. If it does there are some workarounds for both items to disable them completely but leave them in place for visual only inspection purposes!We can start a new thread on this but want to know how much #9 and #10 increase the noise? I little is good but a lot is not.