Ford had four engines in the 5000, the 233 cubic inch displacement (cid) gas and diesel and the 265 cid gas and diesel engines. They also had two transmissions, an 8-speed manual and the Select-O-Speed, kind of an automatic transmission. I have a 1972 265 cid gas with the 8 speed transmission.
Here's a summary of the Nebraska tractor tests (all PTO hp ratings are at rated engine speed of 2100 rpm):
Test 879, April 9, 1965. 233 cid diesel, 8 speed manual, 55.96 PTO hp.
Test 880, April 10, 1965. 233 cid gas, Select-O-Speed, 54.17 PTO hp.
Test 932, April 21, 1966. 233 cid gas, 8 speed manual, 60.37 PTO hp.
Test 933, April 22, 1966. 233 cid gas, Select-O-Speed, 58.49 PTO hp.
Test 996, November 25, 1968. 265 cid diesel, 8 speed manual, 67.23 PTO hp.
Test 997, November 25, 1968. 265 cid gas, Select-O-Speed, 65.54 PTO hp.
Test 998, November 25, 1968. 265 cid gas, 8 speed manual, 67.31 PTO hp.
Test 1000, December 2, 1968. 265 cid diesel, Select-O-Speed, 66.49 PTO hp.
One may purchase a Ford 5000 tractor at sites such as "Yesterday's Tractors" and "Tractor House". They good pictures and customer support to help people choose the correct tractor.
27 hp pto
1964 - 1968: 64 hp 1968 - 1972: 74 hp
The 2007 Ford Expedition's engine produces 300 hp @ 5000 rpm.
The 2006 Ford Expedition's engine produces 300 hp @ 5000 rpm.
The 2005 Ford Expedition's engine produces 300 hp @ 5000 rpm.
The 2008 Ford Expedition's engine produces 300 hp @ 5000 rpm.
The 2006 Ford Taurus's engine produces 153 hp @ 5000 rpm.
https://www.youtube.com/watch?v=tb1ul7yZ3FU The above decribes how to adjust the brakes on the ford 2000, 3000, and 5000 tractors.
I own one and was told by the local dealership that it was rated at 56 HP.
The first Ford tractor was produced in 1907, but it is very different from today's tractor. The first Ford tractor similar to a modern tractor was introduced in 1929.
5000