Looking for a GMC 401 Water Pump

[triplep]

Does any one know where to get a rebuilt water pump for the bigger GMC V-6 401 and 478 or even a rebuild kit? Thanks in advance.

[tommr]

do you have the keyed shaft with end threads or the flat flange with 4 threaded holes?

[triplep]

It is the keyed shaft. The truck belongs to a local business . Runs good but pump developed a leak.

[tommr]

so you have air brakes. parts geek.com #59-8146. you may want to contact them and make sure that the item pictured is the actual item. they are showing it as a Suburban unit but the Sub never had air brakes. A1 cardone stuff is pretty poor stuff but it will get you on the road. they are showing $10.00 core but I wouldn't part with the core. watch ebay. I bought a couple new ones on there when they pop up. Summit used to have them but it looks like they no longer have. good luck.

[triplep]

Thank you very much for your help. I have not ordered yet as I want to check fitment. They kind of show a mixed up application table. I know this does not fit the 305 they say it does. If it is the one pictured I will have it. If they sub a non threaded shaft I will not have it. Thanks again for your time and valuable information. It sounds like Cardone either cannot get cores or no longer does them.

[tommr]

actually this did come on 305 trucks and buses that had air brakes. the 305B was a popular bus engine in school buses.

[triplep]

Thanks for that information. All of the 305 engines that I ran across have not had air brakes. I am waiting to make a phone call . Northern Auto Parts website says they have one . I have found out they do not always have what they say they have so thus the phone call. Thanks again.

[tommr]

you can also google the Cardone part#. there are multiple sites showing them in stock. partsgeek was the cheapest. if you can get the oem # off the original casting you should be able to cross it over to an Airtex or other brand. you should also be able to cross the cardone # over as well.

[triplep]

Well , I do not have it in my hands yet but I did get one ordered. As you said , Summit was out of stock. After a phone call Northern Auto Parts was also out of stock. I ended up ordering from Amazon. They say they have it but time will tell. With free shipping Amazon ended up being the least expensive. Without your help on the part # I never would have found it. I would say this though . If you want one supply may be limited. I found less and less of the companies are stocking it and I think it may disappear. Low sales probably. I will try to update this if it arrives and is the correct one. Thanks

[Donny]

Let me know if it's the right one and the part number , I am building a 478M
Might as well get one
thanks Donny

[triplep]

I will try to update when I get it . The owner of the truck is going to bring his old pump when it arrives. I am trying to help him out and kind of the middle man in this deal. tommr is pretty sharp on this stuff and you may want to shoot him a message. I think he gave the part # in an earlier post. Thanks

[tommr]

we ate several of these pumps in our 1947 Flxible Clipper 29 passenger motor coach. bought a 22 inch fan with 6 injection molded blades around an aluminum hub. had a friend machine the hub to fit this air brake style pump. weve run 5,000 miles with no issues. found some more air brake style waterpump part #s : NAPA 42105, 55 5005; Airtex AW 5005; GMB 130-6005

[turbobill]

That is one fine looking bus.