Step Van Fans?
That's where the parts are listed...in the 1973/79 Ford LIGHT Truck Parts Catalog.
Doesn't make much sense to classify F500's as "Light Trucks" since there isn't much difference between an F500 and F600.
And, if y'all are unaware, M450/500's are genuine Ford Class A Motor Homes. How many of y'all have ever heard of...or seen one?

Club Wagon, I looked back at the initial question of your thread, about roadability and handling. For my example (Grumman-Olson aluminum body on a P350 powered by a 300 six and with single rear tires, not duals), it currently is pretty bad! But I think I can make it a lot better. First, I believe all the front-end joints need replacement. The steering box and rag-joint may need attention, too. As I said, I haven't started on this project. It might be that my truck lacks any sway (actually anti-sway) bar, which could be a good addition. But probably the worst feature of my truck, which exagerates the already-bad effects of loose front-end joints, is the tires, bought new by the previous owner. Instead of modern truck radials (which I will get!!!), he had a set of bias-ply MILITARY TREAD tires installed on the 16" split rims. You've seen these tires on Army trucks: big center rib and big sideways cleats with right-angle edges. Guaranteed to grab hold of the slightest ridge or ripple in the pavement and jerk the vehicle all over the place! Their sole positive attribute is that they wear like iron. In fact they might as well be made of iron, as bad as they handle! My only question is what to do with them, since they sure won't stay on my truck. Now none of that is a good answer to your question, Club Wagon, since you want to know how a properly-shod P350 with tight front-end joints and proper allignment works on the road. I won't be able to tell you that for a while, and I'm as interested in the answer as you are.
As to the adequacy of the 300 six as a powerplant for a loaded P350, I think it depends on the individual engine. I am going to rebuild mine with all of the standard hot-rodding tricks that will improve low-to-midrange torque and fuel efficiency. Better induction, better exhaust system, a little more compression with a tight squishband, DuraSpark 2 ignition; also balanced, and having ARP rod-bolts and forged pistons for longevity. These things were geared for pulling power, not economy or long highway runs, so a six, especially a "built" six, will do the job.
FYI here's a fair working/generic definition of what a step van is:
What Is a Step Van? | eHow.com
I'd be happy to entertain asking modville to relocate this thread in another section, if anyone can convince them where it would be more appropriate. I freely admit having had trouble deciding where to post the topic of FORD chassis step vans on FTE.
However, IMHO if "orphans" like the Fiesta, Merkur, or Edsel have any relevancy to a discussion of FORD chassis step vans, or FORD Trucks in general, nobody posted any evidence of it.
Please keep in mind that the extremely interesting, informative, 40+ page & long running 'Vintage Step Van' thread, in my link from the Hokey *** Message Board, is on a Hot Rod forum.
Uh huh . . . after which you continue the "debate" . . . making you a bucket of laughs, too, I guess.
You have only yourself to blame, because you posted this thread in the Large Truck forum.You could have posted the question in the 1948/60, and/or 1961/66, and/or 1967/72, and/or 1973/79 trucks forums.
Other peeps have, because I've answered questions pertaining to P Series Parcel Delivery's in all these forums.
Maybe you should ask FTE Administrators IB Adrian and IB Tim to start a new forum just for P Series and Step Vans. But, Step Vans are Chebbies.
You have only yourself to blame b/c you posted on Fiesta, Merkur, Edsel & Chebbies, then tried to split hairs between what's 'Light' & what's 'Large'.
IMO there is no debate on; what step vans are, OR that Fiesta, Merkur, Edsel & Chebbies are not FORD Trucks.
Go see a dentist.
You are too touchy for this medium if a digression from the subject of your thread annoys you, and if you can't react with humor or just let it go. Meanwhile, your need to assign "blame" is absurd.
For what it's worth at this point, I thank you for your link to the long discussion of step vans on another site; very interesting.
Sorry, but at this late date your "ruffled feathers" critique seems more than "a little ****". Suggest you follow your own advice & "let it go" fercrissakes.
If you agree Hokey *** Message Board's 'Vintage Step Van' thread "very interesting" it should be a no brainer for you to contribute On Topic, here in 'The Step Van Fans' thread. Or maybe you're "too touchy for this medium"?
Ford Trucks for Ford Truck Enthusiasts




Ah, but you can protect the content of the rest of the thread now; you've driven off those who were willing to try to help with your questions but commited the sin of being irrelevant to your thread (How awful!!). Have fun! You'll get the last word.
The Ford Truck Enthusiasts Forum thread, Step Van Fans (like the Hokey *** message Board thread, Vintage Step Vans) are both in the public domain & subject to the deprivations of hecklers. Only mods "can protect the content" from those who've "commited the sin of being irrelevant" by way of their obsession w/Off Topic derailing.
So, whatever you have, is not a P Series. Your truck has a 17 digit VIN .. The 5th, 6th and 7th digits is the series code, post what it is.




which are pretty common although mine is a KABmaster and most I seen are KURBmasters and are less tall. Is your sporting the in-line six engine? What kind of help do you need?