First off let me say. I just had my transmission fluid change this summer. On my trip to Lewiston ID I had the Quadzilla on Level 2. I made it to the Casino outside of town and stop for a minute to grab a few things. Pulled back out on the highway rowed up through gear and it started clicking. WHAT?! Any gear had a very loud clicking noise even neutral as long as it rolling. I figure out pretty quick its was the input gear from the input shaft. Towed it home and pull the transmission. Yup you can twist the input and feel the gear is got broken teeth. 

 

NOTE: Remember the Quadzilla was on level 2 (stock fuel), fluid was just changed this summer and fresh and full. When I drained the fluid is was still clean but full of fine glitter.

 

Now I opted for a different trans builder. I got a connection with a builder up near @Dynamic up there in Northeast Washington. The gents name is Jason Hammer. He dove in and looked over my transmission basically I wore the hard facing off the those gears with over 435k miles. Totally normal wear for those gear and distance since those gears never been changed. Now the countershaft is one unit and will be replaced as a full unit. I'll post up the carnage as soon as I go back up north 5 hours away to get my transmission. 

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Edited October 3, 20213 yr by JAG1

Yup a wet fluid changed every 20k or so will make them go long. Thf1000 would be my pick