GMC W4500 / Isuzu NPR Service/repair manual

FoxCPM

FoxCPM

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Does anybody have a service manual in PDF file to share?

There are a bunch of boards and forums about any other brand trucks, but not Isuzu.. In fact this is the most common used truck by contractors in USA.

Does anybody know what tranny fluid does it use and does it have an internal filter besides the outside one? Would a flush trough the external filter be appropriate?

I am talking about GMC W4500 99-04..

What does it mean when the "check trans" starts to flash?

I accidentally got to a gadget that is supposed to reduce fuel consumption by 20%. If that thing does not damage and it really works, this could be revolution with the diesel prices these days.
Any feedback on it please? LINK

Thanks guys

D.
 
Ok, so this what I found so far :):

The transmition has 2 filters, internal and external. The pan does not come with gasket. The dealer sales their special brand silicon for like $30 bucks, or Gray 3M silicon can be used. Dextron 3 fluid, about 9 quarts, up to 12 with full flush.

Greg, have you found a good workshop manual? I see haynes manual for $100 on the net. I have purchased Haynes before for other vehicles and I don't like them much..
 
I have a manual somewhere with my 2006 isuzu,I just remember when i bought it the sales team and service department couldnt tell me enough times to service that transmisson when it needs it.Or it will give out it must be a weak link i hope not but time will tell.
 
The dodge sprinter might be an option for you if you are looing for decent mileage.Depending on the weight you carry.The single axle one get 16-18.You can get it with a box also.
 
I'm getting 10 MPG with my Toyota Tundra pulling my enclosed trailer. It's not the weight so much, I believe it's the flat front of the trailer that sticks up 2 or so feet past the cab. Bad aerodynamics. I was thinking about buying an NPR flat bed because I was under the impression they got around 15-18 MPG diesel. That would have kept me from putting so many miles on the truck and gotten a little better mileage. Maybe I'll just switch to an open trailer. Sorry for the hi-jackin'.
 
I had a 07 Black Tundra before the box truck it was a sad site to to see chemical all over that black everytime the wind blew wrong.Now a flat bed isuzu might be get better mileage.Greg what type mileage do you get with your flatbed isuzu truck.
 
Not trying to hi-jack the thread but I was wondering if anyone had some serious engine problems and had to rebuild/replace the engine and what kind of price tag that came with it.

I have been wanting a flatbed truck for a while now but concerned with the engine and transmission so I was thinking more like the Ford/Chevy/Dodge flatbed because it might be less expensive to rebuild/replace those engines and transmissions.

Just wondering out loud.
 
Chris the isuzu transmission will out last any of the 2 you stated above if maintained properly.The engine on the other hand is about 6,000 for a used one lol .
 
Greg, Yup I will be changing tranny fluids on all trucks. The last one I bought has the tranny light on, but I think its low on fluid and not a big deal.
Unfortunatelly the diesel prices require some budget shrinckage and I am now more involved into DIY stuff. Power Sweeping service is very sensitive on fuel prices..

Dealership charges $300 for tranny flush, It cost me around $85 to do it myself. for 3 trucks it adds up..
 
Hey Chris, As far as the sweeper trucks, they put up lot of mileage as they average 90-100 per night every night, non stop. The back motors are isuzu 60hp and they are strong as hell in my opinion.

The sweeper truck drives a lot in circles on low gear most of the time with gas/brake pedals on all the time. I consider this a good survival test for both motor and transmission.
An used motor runs about 5000-6000 and it is not more expensive than a powerstroke.
Used tranny cost about $3000-4000. The dealer sold recently an used engine with around 100k miles for $6000 and the tranny for $3800.
I think the truck is very easy to maintain due to its simplicity.
It is 4 cylinder, not too powerful engine and therefore fuel consumption depends a lot on the load and the driving speed. A 7.3 Powerstroke is so powerful that it wont matter if it's loaded or not (again my personal opinion).
I have had box truck isuzu in the past and almost empty on the way to the Florida keys with 55m/h constant speed averaged over 17 miles per gallon
The sweeper trucks average 12 to 14 miles per gallon on the hwy and they are heavy due to the back motor and the heavy hopper. They don't drive over 65m/h, at max speed of 74m/h they eat the diesel as fast as 9 miles per gallon.

Again I will chose an Isuzu/GMC medium duty over any other truck if it's for work purposes, driven by employees.

PS sorry for hijacking my own thread.. :):)
 
Thanks for the info Dimitar, sounds like the NPR is a good truck after all, just have to put away some money so if/when the engine/trans goes out it can be fixed/replaced quickly.
 
I have said many times the isuzu/w model gmc are the best medium duty truck platform on the road, There is a reason you see so many on the road. Their not fast,powerful or the best ride but they just keep running. I have always heard the transmission is suspect but I haven't witnessed that. My old Isuzu started its life as a sweeper and was abused then sat for over two years without being started. I anticipated having to put money into it but all I had to do was change filters and put new batterys in it.
 
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