how important is the transfer case fluid? and what happens if you run the truck without any transfer case fluid? 1 Answer.But due to the location of the hole, fluid won’t escape. This friction is often referred to as pump rub, and it eventually leads to a small hole in the transfer case, followed by a fluid leak.After a rear differential fluid change, most vehicles will go 20,000 to 40,000 miles before it’s due again. A rear differential service consists of removing the rear differential cover, cleaning any old fluid from inside the differential case, resealing the cover, and adding clean fluid.That is why this fluid is sometimes known as lifetime fluid. This type of fluid is used in antique type vehicles which are being preserved for a long time. It is almost like 5 to 6 times as much as DOT 4. However, the silicone-based DOT 5 brake fluid is quite expensive.
