Transmission issues.

[Mac VP]

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Since there are no synchronizers in the truck 4 speed transmission, they will really benefit from using the heavier 140wt gear oil. This will help slow the spinning gears down sooner than the 90 wt oil….very helpful when up shifting.

If stored inside, there shouldn’t be any water leaking into the transmission. Perhaps you didn’t get it fully drained before. If water has accumulated inside the gearbox over time, chances are that there may be some pitting of the lower gears inside. That may or may not have weakened the gears, but it’s certainly not good for the bearings. With the straight cut spur gears in this unit, it’s never going to be a quiet gearbox but pitted gears and rusted bearings will add to the racket. None of this affects the shifting performance issues however.