What are some problems with a 98 12 valve - Dodge Cummins Diesel Forum
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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 08-03-2012, 04:04 PM   #1 (permalink)
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What are some problems with a 98 12 valve

I have a 98.5 24 valve 2wd automatic. I need a four wheel drive and wanted to stay with a diesel. I found a 98 12 valve for sale like I want and was wondering what problems if any they might have. The truck has 160,000 on it and it is an automatic. Are the transmissions in the 98 12 valve same as the 98.5 ? I already had to have mine rebuilt.
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Old 08-03-2012, 06:10 PM   #2 (permalink)
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KDP First thing!
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Old 08-03-2012, 09:32 PM   #3 (permalink)
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Man said it has been done.
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Old 08-03-2012, 09:37 PM   #4 (permalink)
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Man said it has been done. KDP that is, sorry stupid post.
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Old 08-03-2012, 11:10 PM   #5 (permalink)
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The transmissions were 47RE from 1996 to 2003 (give or take a year). That means a 1998 and a 199 should be the same. The only potential issue would be the solenoids having a different connector for a different wiring harness. I am not saying that is true. I am simply saying it is possible. If it is truely an issue you just put the solenoids for your year truck in the other transmission and it is now the same thing.
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Old 08-04-2012, 12:42 PM   #6 (permalink)
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I would like to get a 5 speed manual tranny but they are scarce around here, If I get the truck with the auto it will prob have to be rebuilt. Thanks
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Old 08-04-2012, 04:06 PM   #7 (permalink)
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I have 373,000 on my factory stock 96, original p7100 and injectors, tranny still works ~ sorta. Converter won.t lock, but I managed to pull my overloaded 5th wheel with all my tools - lots and lots of tools - from South Florida to MI. My only current issue is that my boost boot from turbo to intercooler has been cut and torn where it meets intercooler, tight spot and I think I may have pre-loaded it with a twist 30,000 miles ago when I did KDP, raidiator flush etc.

The fuel heater and water in fuel sensors can leak, but Geno's Garage have the service parts. Oh, that damn dashboard can crack from too much sun, a plastic sunburn.

door hinges get worn after 300,000 miles. but hell, you see many cars with that many miles?
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Old 08-04-2012, 05:18 PM   #8 (permalink)
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Thats a lot of miles on the tranny. I had to have mine rebuilt at about 140000 miles I think. My dad might have towed in overdrive. He pulled a 22 foot airstream camper with it.
Thats why I want a 12 valve, I think they will out last a 24 valve and they are easier to work on. I am nearly 50 so the truck will probably outlast me if taken care of. My dash is cracked too.
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Old 08-04-2012, 06:52 PM   #9 (permalink)
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Since you already have the 98.5, then you're looking at the same truck, except the 12V and the lack of all the electronics that control it. The 98 12V is only 180 HP, same 47RE tranny. Only real issue is the KDP, but that hit the early 24V's too. Of course there are some specific 12V maintenance items to address, but all are minor. Good luck.
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Old 08-04-2012, 08:32 PM   #10 (permalink)
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Quote:
Originally Posted by FF1063 View Post
Since you already have the 98.5, then you're looking at the same truck, except the 12V and the lack of all the electronics that control it. The 98 12V is only 180 HP, same 47RE tranny. Only real issue is the KDP, but that hit the early 24V's too. Of course there are some specific 12V maintenance items to address, but all are minor. Good luck.
"Of course there are some specific 12V maintenance items to address, but all are minor."

OK, I need to know, other than the KDP, what other specific 12v issues. I replaced my crank dampner as the rubber was deteriorated, the bumper rolled back and pinched the tranny cooler lines, so I replaced my tranny cooler, I replaced my oil pump, water pump, hoses and recently my u-jionts, Today I replaced my boosts hoses to intercooler. Are there other issues? I have a DNR potentionmeter to replace my bad TPS, I desperately need a new converter and tranny overhaul, and the constant balljoints.

My understanding is 12v is pretty much bullet proof, after all the maintenance i've done I was hoping I pretty much covered everything. I too am racing to 50 and plan for this to be my last truck, I figure it will have about 750,000 when I hit my late 60's. hope to overhaul engine in two or three years , when i hit 50.
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Old 08-04-2012, 09:39 PM   #11 (permalink)
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Originally Posted by rockin345 View Post
"Of course there are some specific 12V maintenance items to address, but all are minor."

OK, I need to know, other than the KDP, what other specific 12v issues. I replaced my crank dampner as the rubber was deteriorated, the bumper rolled back and pinched the tranny cooler lines, so I replaced my tranny cooler, I replaced my oil pump, water pump, hoses and recently my u-jionts, Today I replaced my boosts hoses to intercooler. Are there other issues? I have a DNR potentionmeter to replace my bad TPS, I desperately need a new converter and tranny overhaul, and the constant balljoints.

My understanding is 12v is pretty much bullet proof, after all the maintenance i've done I was hoping I pretty much covered everything. I too am racing to 50 and plan for this to be my last truck, I figure it will have about 750,000 when I hit my late 60's. hope to overhaul engine in two or three years , when i hit 50.
There's a small rubber fuel hose specific to the 12V that should be replaced, by chance I just changed mine today, just an 8 inch piece of 5/16th fuel hose ( Iguess that's the type of issue you need to know) I did the KDP way back, when we at the TDR shipped a 'Jig' around the country (98'-99') Other than that, I've changed the starter contacts, Alternator brushes, normal hoses, fan belt, adjusted the idle a few times, tranny every 25K miles, all general maint stuff. Everything I've done is typical, I buy too much crap from Genos etc. I've adjusted the valves numerous times. My 12V has been perfect, 100% of the time, has 180K now. My experience has been never wait for it to fail, mosty all my 12V has been preventative based on other owners sharing of info.
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Old 08-05-2012, 01:01 AM   #12 (permalink)
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Another common issue is with fuel lines rusting through, usually under the bed where they go in to the tank. Of course 24v trucks could also have this problem...

Throttle linkage bushings wear out and cause slop that throws the tps off and will make the trans do funny things, the tps wears out some where near 150k.

Really at 160k if the KDP has been done and the oil and fuel filters were changed it should be rock solid for a long time!
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