yes they do, but there is no pumpkin to remove as the Dana has a rear cover. There are a couple of methods to remove the carrier gear assy... Brute force and a pry bar, or a case spreader... as the Dana is used on a lot of other cars (including Jeep, Dodge and Ford) it shouldn't be an ordeal to find the spreader and do the job correctly. Then it's just a matter of using the special yellow paint on the ring and pinion to make sure the contact patch between the 2 is correct.. Unless the crush washer has been disturbed , it's doubtful that there's anything wrong with it. You can use a dial indicator or a depth gauge to establish where it is at now. The carrier bearings are also shimmed side to side for proper contact with the pinion. If the preload has been wrong for any length of time, you have likely done serious damage to both the ring and pinion.
If it's making a "whirring" sound, that's down to bad bearings. As soon as you get the cover off the axle you will be able to see any obvious damage.
in any event, when you get it all apart, you will be able to determine the condition of the pinion bearing and carrier bearings... I usually farm this out anyway.
I just went through the axle for my Mk2 and replaced both of the axle seals and axle bearings and pinion bearing.. unfortunately, since I live in NE bumfuckistan, the machine shop was unfamiliar with the axles and tried to use a puller instead of a hydraulic press. He broke his puller, bent one hub and managed to mushroom the threads on both axles. Thankfully I have a pal who is a much better machinist and he was able to recut the axle threads and I had a spare hub...
I could have told him how to remove the hubs from the axles, if he'd have bothered to ask...