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Old 11-10-2019, 01:56 AM
Rockett73 Rockett73 is offline
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Default Hello fellow Magnum lovers.

I just purchased a 2005 R/T and was wondering do they all have MDS or was it optional on the 05 model, also how do I tell if it does. Was also wondering what if anything I should be looking for to replace before it breaks. The car has 129500 on the odometer. Already did a set of struts up front trying to eliminate a knocking sound when hitting moderate bumps. As well as the thermostat and temp sensor and rad. fans when they crapped out day 2. Thank you in advance for any advise.
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Old 11-10-2019, 08:42 AM
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jkelly16 jkelly16 is offline
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Welcome to the Z from NC! Glad you joined, enjoy the site!
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Old 11-14-2019, 08:22 PM
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All the R/T's have MDS. I'm pretty sure the SRT-8"s do not have MDS.
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Old 11-14-2019, 11:31 PM
plumbersnitemare plumbersnitemare is offline
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Rockett73 the knocking noise is probably upper ball joints A arms are cheap and relatively easy to change
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Old 11-16-2019, 11:55 PM
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HemiLonestar HemiLonestar is offline
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Quote:
Originally Posted by Rockett73 View Post
I just purchased a 2005 R/T and was wondering do they all have MDS or was it optional on the 05 model, also how do I tell if it does. Was also wondering what if anything I should be looking for to replace before it breaks. The car has 129500 on the odometer. Already did a set of struts up front trying to eliminate a knocking sound when hitting moderate bumps. As well as the thermostat and temp sensor and rad. fans when they crapped out day 2. Thank you in advance for any advise.

All automatic R/T's come with MDS. It can be turned off via tuning. You have an 05 with well over 100k miles. Previous owner probably sold it hoping to avoid higher mileage woes lol. Two most common culprits are tension struts and ball joints. You didn't say if you meant tension struts or the spring/shock combo. Considering some of the substandard material that went into our front ends early on, good chance a front end rebuild is in your future. A cooler thermostat is a good idea on these first gen LX cars because all it takes one good serious overheat and you increase the likelihood of a valve seat dropping; caveat though, no point in installing a cooler stat until you have the means to lower the setting on the cooling fans.
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Old 11-21-2019, 08:50 PM
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Default valve seats

Just an FYI, Overheating is not a prerequisite for dropped valve seats. I researched different forums for years about the valve seat issue after purchasing a low mileage R/T. I read that it happened most often after the car had been parked and not when driving. Probably a heat sink issue with aluminum heads and steel valve seats not fit tight enough in the heads. I was in the process of shopping for replacement heads that had been upgraded in the seat area so I could avoid any other possible engine damage but I didn't do it fast enough. At 84K miles I had gone to a DR appt just a few miles from my home. October, mid 70's temp. After about 30 minutes after parking I went to the parking lot to go home. Started engine and immediately heard the loud sound of " a metal coffee can full of nuts and bolts " After a tow home I removed the spark plugs to check compression. @ cylinders had the spark plug electrodes mashed shut. No high rpms, no high temperature. Happened while starting engine. In the majority of the cases the cars had not overheated or had a temperature issue at all. Just be prepared for it on any early 5.7 car engine. Since the failure had caused engine block and piston damage a complete engine change as required. I has updated heads, updated oil pump, updated timing chain/gar/tensioner installed. 5w20 Mobil 1 on the original and replacement engine exclusively. Be prepared and start shopping for the heads and/or engine replacement. Fortunately these engines are very popular and plentiful keeping their cost relatively low.
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