Pull the tunnel plates and clear the vents for the transmission and do the lube PM's while in there. Time to re-torque the jack shaft bolts to. It is in the TM'sDrained the ND 30 out of my trans, since that experiment failed and refilled with 90wt gear oil. The ND30 made a minor improvement in the cold weather and the first few shifts of the day, but then it would get markedly worse. Interestingly, as things, and the weather, got warmer it would begin to stick in gear and require more force to push into neutral to catch the next cog.
Concerningly, as I drained the oil it came out full of aeration top to bottom. I only moved the truck into the shop, a run time of about 3-4 minutes total and a distance of maybe 150 feet. The oil came out so foamy i thought for a moment that it was full of water. Nearly an hour later the oil was still giving up tiny bubbles, visible in the bucket especially with a flashlight. I can only imagine how poor the lubrication was with that much air in the oil, and with the oil holding it for so long. Practically all modern oils have anti-foaming/ anti- entrapment agents that allow the air out very quickly. Certainly in a lifetime of playing with machines I've never seen a fluid perform that poorly.
I hope to take it for a good run this week, we'll see how it goes.
I switched to Napa 90wt mineral gear oil. I've had it out on one decent ride and it feels good so far, but I'm withholding judgement until I put a few more good trips on it.I run Shell 40wt. It's hot here and I have experienced similar shifting...I might try some gear oil.
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