When things go bad on most dozers the transmissions can be the most expensive. Motor and undercarriage of course the undercarriage always wears out at some point so a good undercarriage makes a older medium-sized machine worth a lot more. Recently put a new undercarriage under a 953d track loader aftermarket was around 12,000 caterpillar was almost $20,000. That's roughly the same track size and equivalent of most D5 size machines. Motors usually somewhere in the 16 to 20,000 transmissions have been we don't even want to talk about transmissions some of them upwards of 40
