The only problem I have heard of with the B300 Allison trans is coolant in the trans, and that came from the radiator/trans cooler combos that developed crack between the two and allow coolant into the trans-fluid. The cure is to replace the cooler. Some sealed the radiator and then put a separate trans cooler on to keep the cost down. Radiator trans cooler is very pricey.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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