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Discussion Starter · #1 ·
I have been reading all the threads about the best plugs for my '04 Hemi and I am going to go with the NGK 5306 plug, My Motor has just over 76k on it and idk if they were ever changed so I am also going to change the wires as well. Any recommendations on which wireset to go with? Is the MSD wire overkill? They arent too much more than the stock replacements at AutoZone. Also I am going to be changing my Diff. Fluids and Trans Fluids this spring, Any recommendations on which fluids to go with?

Thanks- Chris
 

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I read a study on gear oil not too long ago and posted it up in the DF but amsoil and Mobil 1 outperformed rp so I'd use them. Bottom line is they should be replaced every 15k mi so it shouldn't really matter which you buy as long as you get the right weight. 75w90 in front diff 75w140 in rear with friction additive if LSD. Check the transfer case because the nv246 takes a special lube. I'm pretty sure the rest take ATF+4.
 

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About the trans fluid, I've been told all ATF 4+ is basically the same, so I'd just use whatever inexpensive fluid your local store has. I used castrol ATF 4+. All ATF 4+ is synthetic. I'd recommend using mopar transmission filters (you have 2 filters, one is a spin on filter like an oil filter and the other is a typical screen type. Both are inside the pan). I've read that some aftermarket filters (the spin on one) are not "up to par" and may not perform as well. I didn't know this, and used aftermarket filters and have had no problems, however will use mopar filters next time.

I believe oem diff fluid is also synthetic. I'd just use whatever fluid meets the same spec.
 

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Most of the problems with the return filter is the drainback valve that is supposed to keep fluid in the converter. Some of the aftermarket ones don't, so you'll crank up and it'll take a minute for it to fill back up with fluid (doesn't hurt it) and then it moves.
 

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Discussion Starter · #9 ·
Thanks for the replies everyone!I was looking around at autozone.com and i was looking to see what wires to go with, i came across Duralast(store brand) and Bosch wiresets for under 60$ and the performance ones were well over 100$. On a stock motor is it even worth going with the performance wires? Any recommendations on stock replacements if not?
 
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