Cooling Differential covers, do they really matter?

[85_Ranger4x4]

Old Ford Rangers are a dime a dozen. Most look pretty beat up. The remainder look all tht more appealing. They are so old that the sacred "blue book" means very little. These are the kinds of things that help the truck hold its value. It tells a savy buyer that you changed the oil in the differential at least once, and that makes for a higher resale price.

Rear axle oil is changed so infrequently I would assume:

1. Axle is noisy and it was filled with Lucas to quiet it down and get to get someone else's name on it

2. Replacement oil is probably wrong, at best make a note to rechange it ASAP after buying.

3. Truck was flooded.