A Jake brake is an engine compression brake. Using a GV in combination with a Jake brake is hard on the GV unit. One of my friends had two of them replaced under warranty until they figured out the Jake brake was causing the problem, removed the Jake brakes from the engine and the third one has lasted fine they say. Apparently GV didn't know of this limitation to start with and I don't think they mention it on the website.
A big cubic inch gas engine holding back on a hill could have the same effect on a GV unit as the diesel with a Jake brake did.
Grigg
