Cat/claas challengers best model made

[farmerman]

In people’s opinions what would you say were the main differences from the very early crawler flat track challengers then on to the claas/cat combination I understand this was built in the Ford factory would they be as strong as the originals? Then the 700 series more intrested to hear about the very early ones on these a and b models. They seem cheap hp for what they are and out of fashion at the minute onviulsy there’s a fair few more maintenance bills and costs being tracks and not a wheeled tractor.
Many thanks

 

[Chae1]

75E

 

[snarling bee]

75E,
although our 95E has a bit more 'go'