Join Date: Nov 2016
Location: NE Ohio
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
If 4WD - system: QD-II
Current Mileage: 133,000
The 3.7 (and the 4.7 since the V-6 is the same block - the front two cylinders are just a chopped off the V-8) doesn't have lifters - there are rocker arms that ride on the cam on one end and press down on the valves on the other. The 3.7's from '02 through '04 are notorious for rockers coming off their mount and obviously causing quite a racket. The issue doesn't usually cause a problem in the cylinders with valves hitting the pistons since the valves are by default held closed by the valve springs. Since the Commander didn't start till the '06 model year that shouldn't be an issue.
I replaced the 3.7 in my '03 Liberty due to a low end tick/slap that devolved into a full-blown knock. The previous owner was not good on engine maintenance (very good on keeping it washed and rust-free though) and when I tore the engine down it had burned crank bearings from long OCI's or letting it run low. I'm OCD with oil changes and that probably removed sludge before it went bad but that engine was toast when I swapped it out with one from an '06 Dakota with 9000 miles on it.
My suggestion is thicker oil; I run 5W30 in my Liberty's '06 engine and it runs great. A little thicker viscosity in your '06 Commander may help with the ticking. Also check the belt tensioner - it will make interesting sounds as it starts going bad.
My 2 cents...
2006 Limited, 5.7 Hemi, Tow Package, SuperChips tuner, Full Skids, RER MyGIG Upgrade. OME HD Springs w/ Bilstein 4600 shocks
Last edited by TwoBobsXK; 12-10-2016 at 01:28 PM.