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Long term update: I replaced the bushings but have been running a 'large' cooler in the rear for the diff for the past 3 years and 6 HPDE events. The bushing still looks "new" and no longer melted. Trans temps have not gone above 220F ever since.
I do wonder what temps the diff case had to get for that bushing to melt multiple times, and even more curious of what temp the fluid inside was getting. Anyone know what temp Poly bushings melt at?
I've also installed a trans cooler and it too has not gone over 220F since. Hoping this keeps the trans alive longer.
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