Originally Posted by LostChord
Ed, would overfilling an 85/95/380/380-stumpy be a problem, or is that something specific to the LT77?
I don't know anything about the LT85 or the LT95, but at a very high level, the R380 is not much different from the LT77 other than some beefed up parts and a different reverse gear design.
Unless you're filling the gearbox through the reverse light switch hole, there's no way to overfill the gearbox to the point where it's more than a fraction of a quart full. I guess if you jacked the truck up on one side, you might be able to get more in there, but if you're doing that, you're doing it on purpose.
It's not like the engine where the crankshaft has to stay out of the oil. The standard fill level of the LT77/LT380 already totally submerges the layshaft and gets very high up on the mainshaft gears.
I guess if your gearbox seals are in bad shape, you'll just leak more oil =)