does the running gear of a case 800 terra trac line up with a case 1000d terra trac drott dozer
Robman - Yes, the Case 750, 800, 800B, 800C, 850, 850B, 855C, 1000, 1000C, 1000D, and 1150 are all the same track (6.25" pitch). You can also do a conversion to 6.75" D4 undercarriage. The Cat conversion involves a new Cat D4 6S7879 sprocket rim welded to the Case sprocket. You use Cat D4, 6.75" pitch chains and shoes, and utilise the original Case rollers, carrier rollers and idlers.