Miko:
I forget what I paid for the alternator, maybe 300 installed. the $400 fuel pump takes two hrs labor for a mechanic. 1/2 hour if you have precut a hole in the floor and you replace it yourself.
If you've got the 1 ton and use it OTR, you should easily get a half million miles from it if you treat it right. Try a simple cost analysis to compare a new with your old van.
Assume each van will be serviceable for 500,000 miles and also assume your van operating expenses (fuel, oil, lube, repairs, tires, supplies, washing, insurance) will be the same for each. Also assume the scrap value of each dead van is equal.
You've got 244,000 miles remaining on a ($10,000?). That'll cost you
41 cents per mile to own the used van.
You'll get 500,000 mile on a $21,000 (that's cheap, I think) van. That'll cost you 42 cents per mile for this van.
These examples are pretty much a wash so if your used one is considerably cheaper, you'll save more than the penny a mile ($2,440). Then again, a new van with the accessories you want and a warranty, may give you a peace of mind worth more than that penny.
Terry