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Old 05-16-2017, 05:19 PM
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Default Water Pump

My 2004 Dodge 3500 5.9 sprung a leak this morning. Large puddle under the truck. I see two P/N's for the water pump, 5086959AA and 5086959AB for my truck.

Any difference between them?
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Old 05-16-2017, 07:44 PM
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Yes, the part numbers are different

5,555 posts today, and not a one any better than the rest.

Best I can see, AB supersedes AA.. Id go with AB. Otherwise, it says they are interchangable, but Neal might know the nitty gritty.

How many miles did you get ?
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Old 05-16-2017, 08:04 PM
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Originally Posted by Windy_Acres View Post
Yes, the part numbers are different

5,555 posts today, and not a one any better than the rest.

Best I can see, AB supersedes AA.. Id go with AB. Otherwise, it says they are interchangable, but Neal might know the nitty gritty.

How many miles did you get ?
215K It is getting new upper and lower hoses too. Thanks for the info.
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Old 05-16-2017, 08:37 PM
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Don't have a clue other than I can tell that is not a Cummins number. May be a supplier change, or update. If it's a mopar number all bets are off.


I've seen some water pumps with a tin cover over the ends of the veins and some without.

I get the gates from oreillys for about $60

It's a great time to flush your cooling system and change antifreeze. Over time the additives wear out in coolant and it can become caustic to cast iron.
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Old 05-16-2017, 08:58 PM
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Originally Posted by SmokinDodge View Post
Don't have a clue other than I can tell that is not a Cummins number. May be a supplier change, or update. If it's a mopar number all bets are off.


I've seen some water pumps with a tin cover over the ends of the veins and some without.

I get the gates from oreillys for about $60

It's a great time to flush your cooling system and change antifreeze. Over time the additives wear out in coolant and it can become caustic to cast iron.
I have an O'Reilly here it town. The coolant will be replaced as well as the upper and lower hoses.
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Old 05-16-2017, 10:04 PM
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Neal, do you put and sealer of lube on the Oring on the water pump?
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Old 05-16-2017, 11:29 PM
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I just use a bit of axle grease to hold the seal in the pump as I put it in place.

That has to be one of the greatest designs of a water EVER, btw.
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Old 05-17-2017, 07:23 AM
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I just use a bit of axle grease to hold the seal in the pump as I put it in place.

That has to be one of the greatest designs of a water EVER, btw.
i was amazed at the simplicity of the design too. I was expecting 5-6 bolts and 2 of which, would be a bitch to get to. Look like it will be the easiest water pump replacement i have ever done.
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Old 05-17-2017, 07:48 AM
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Change out the heater hose's too...
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Old 05-17-2017, 02:46 PM
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Change out the heater hose's too...
Got the pump and radiator hoses done this morning. Supposed to rain the next two days, so the heater hoses will have to wait a few days. Driving with the radiator flush for 2 3 days anyway before the the drain and fill with new antifreeze.
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