Question about 2006 Dodge Ram 2500

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Hemi engine/differential I'm told there are 12 to 26 spark plugs in my hemi engine, really ? I'm also told I need to change the differential fluid since I'll be towing a trailer sometimes.

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  • weathernut Oct 28, 2008

    Thanks. It's a 5.7, purchased used. When I went in to have it serviced they said it needed new plugs and fluids, including the rear end. I don't have the owners manual for this truck. It's my understanding that only the hemi magnum has two plugs and this is not a magnum. the trailer is a two horse horse trailer, about 5,000 lbs. Only towed occasionally on mostly flat roads. Thanks for the response.

  • hemiboy89 Dec 21, 2008





    2007 ram 1500 5.7 4x4 what weight oil do i use in both the diffs

    for serve driving and towing 4000# camper


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Hemis take 16 plugs every 30k. doesnt matter if its a 5.7 or a 6.1
9.25 axle take 75w140 plus limited slip additive. all others take 75w90 and dont require additive. t-case takes atf+4 should be done at 30k also

Posted on Jan 22, 2009

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Hemi V8's do have 16 Plugs from what year Dodge started I do not know, I just changed mine out yesterday and Yes 16 of them on my 2006 Ram SLT(2 per cylinder) the 2nd plug is to burn off the remaining unburnt fuel vapors on the bottom side of the down stroke. This is Dodge's way of saving fuel mileage, the engine has been designed with MDS(multiple displacement system) to where the engine runs on 4 cylinders until on demand you desire the other 4 cylinders to kick in. The MDS works at slower and crusing speeds. Also if your vehicle is a 4x4 with a limited slip rear end you do need to change your rear differental fluid at the 15,000 mile manufactor recomendation or a chatter will begin to occur no matter what your towing situations are. The 2WD truck at the 30,000 mile.

Posted on Nov 15, 2008

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26??? Someone is pulling your leg. That, or they have no idea what they are talking about.

What size hemi? the 5.7 or the 6.1?

Changing the diff fluid is a maybe. How big of a trailer (weight)? How often do you tow it? What kind of distances? What kind of terrain (hilly, flat, mix)? All of those items come into play.

Posted on Oct 28, 2008

  • Coss Oct 28, 2008

    Yes, single plug then (8 of them total).

    That's not that bad of a load for that size truck.

    Do follow the factory specs for changing fluids. (except for engine oil, and I have always argued with that 3 months 3,000 miles, even as an ASE certified mechanic) I look at driving conditions and usually go about 5,000 to 6,000 and 4 months (3 times a year)

    One thing I do highly recommend is using synthetics everywhere you can. This also helps with oil life.

    I do that in all of my own personal vehicles and think it is one of the best things you can do. They are slightly more expensive, but very much worth it.

    If you are really concerned about towing stress, put a bigger transmission cooler on.

    Also, make sure to change your shocks according to specs. And when you do, step up to the next better grade. You'll be amazed how it improves ride and handling.

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1 plug per cylinder unless its some sort of exotic 2 plug per cylinder variant.In other words if its a v8 it will have 8 spark plugs.You would not change diff fluid although i would be interested to know what your advisor would replace it with.Im sure the factory that built your vehicle knew you would be towing if they put a tow bar on it.

Posted on Oct 28, 2008

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