I have an highway truck running in India with the Eaton 9106 6 speed transmission. Recently I replaced the Navistar I4 engine with an rebuilt engine, with substantially higher torsional vibration. I measure old engine at 300 rad per sec2 vs new rebuilt at 900 rads. Everything works ok except that my transmission synchros are wearing substantially. Even with a few shifts in lower gears and mostly highway miles (high 5-6 shifts) all the synchros are worn in 15,000 kms. Is this common with higher torsionals?
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