My 42RLE has experienced sloppy down shifts & I wonder if on level ground it could be a tad low on ATF+4 ??
Take it for a 20 min drive at hwy speed, & then check the dipstick fluid level. Just adding a bit more fluid may help.
Is the fluid clean? Have you ever had the transmission filter serviced?
Is the electric fan running at high speed? Fan should be noticeably noisy if its really warm outside. What are the outside air temps where you live?
Here is the correct thermostat part#..
What spark plugs did you install? Jeep likes copper core ZFR 6F-11G gap set at .040
Which brand of coil packs did you install? I used Standard Brand coil packs with no issues.
What OBD 2 codes are you getting?
Any Group 34 will fit directly into the KJ. Of course the AGM is best.
The best AGM is an Odyssey Battery, but expensive. Odyssey uses virgin lead.
My Odyssey AGM is now close to 13 years old & still fires Jeep right up !!
If you buy the best, it won't die like the rest. :)
I stopped buying lead acid batteries many years ago. AGM's tend to provide greater cranking power, especially when it's below freezing.
You won't see corroded terminals on AGM's either.
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