OK thanks.
My rear chain is having problems. Since I have to pull the engine I'm likely going to do all the chains parts that need service / are plastic / may fail over the next 30k miles on a 120k 2005 Explorer, 4.0L V6 SOHC.
Right now I'm debating between one of these kits:
Cloyes Engine Timing Chain Kit 9-0398SB
Duralast Kit
Or OEM parts:
Jackshaft/primary timing chain kit 2U3Z6D256CA includes:
OEM $255.33
Left/front timing chain cassette assembly 7U3Z6A257A includes:
OEM $137.58
Right/rear timing chain cassette assembly 4L2Z6M290AA includes:
OEM $137.92
00M12 intake manifold kit YL2Z9E473AA includes:
?
Right timing chain tensioner 7U3Z6K254A supersedes XU3Z6K254BA
OEM $76.87
Right timing chain guide assembly upper positioning bolt F77Z6U000BA
OEM NA (can't find for 2005)
Jackshaft rear sprocket retaining bolt W703167S430
OEM NA (can't find for 2005)
Cover assy/rear of block jackshaft opening plug F77Z6026AB
OEM $18.90
Left cassette assembly lower mounting bolt W500100S300
OEM NA (can't find for 2005)
Jackshaft chain guide mounting bolt W500100S300
OEM NA (can't find for 2005)
Sprocket/gear-crankshaft inner four wheel drive F77Z6306BE
OEM $38.42
Sprocket/gear - crankshaft outer four wheel drive 2L2Z6306AA
OEM $26.97
Balance shaft chain guide F77Z6K297BC
OEM $14.13
Balance shaft chain tensioner 1L2Z6L266AA
OEM $28.25
Balance shaft chain F77Z6268BC
OEM $43.33
Seal-front timing cover E6TZ6700A was superseded by 5H2Z6700AA
OEM $39.48
Seal-rear main crankshaft F5TZ6701A
OEM $66.95
I'm not sure if there is a cheaper place to get the OEM parts, which ones I'll need exactly or if those kits are good or not.