Starting with the Series 2000 in 1990, finding a 38-40 Newell is going to be tough. There are some out there but not many. It is easier to find a Classic style (pre 1990) in the 38-40' range. The Detroit Diesel V92's were used in Newell during that time period were good engines. They are two stoke engines rather than four stroke. They don't like to be lugged and they don't have the fuel economy of the later Detroit Diesel Series 60 engines but they have a lot of power.
There are Detroit Diesel service centers all across the U.S. Give them proper care and they are a good strong engine. Although I would have prefered a Series 60 for the fuel economy, I bought a Newell with an 8V92. I had the engine dyno'ed and it passed with flying colors, my 500 BHP with 119,000 miles on it was turning out over 410 HP at the rear wheels. Considering the 18%-20% loss you expect to get through the transmission and differential, that means that it was still turning out factory rated power.
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