Posted by Destroked 450 on December 06, 2020 at 14:17:01 from (66.38.93.182):
In Reply to: Re: v8 farm tractors? posted by The tractor vet on December 05, 2020 at 07:17:19:
Not exactly a fair comparison there, same gearing and transmission with two engines that were designed to operate at completely different rpm ranges NTC350 was factory governed at 2150 with a sweet spot around 16-1800 rpm, VT350 was factory governed at 2750 with sweet spot around 23-2500 rpm, under 2100 was lugging those engines. RTO9513 transmission was not recommended for use behind a 903, the RT9513 direct with under drive was the better choice due to the engines higher rpm range, same with rear gearing, 4.44's was considered high speed gearing for a 903 were 4.11's was a better choice for a inline 6, I ran 4.77's on big rubber that limited the truck to 72 mph but on KY and Pa hills a stock NTC350 could pull with my stock 320 hp VT903 and I averaged 1/2 mpg better fuel milage than any of the 318's, 290's, 350's and Cats that worked for the same outfit as me. Now a NTC400 was another story was well as the 380 and 425 Cats, I would move over into the slow lane and watch they go away.
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