Originally Posted by Route55
As for OD, it is definately a weak link in the 4500 and 5600 trans due to the secondary nature of the design. Poor cooling and small parts with poor support. As for the G56 I have now, the design appears much better. I'm simply cautious. I have been running loaded the last 5,000 miles in OD, no issues so far, and very pleased with it.
That is the first time I have heard of the OD being a weak link the 5600. The only weakness I have heard of is the input shaft bearing not getting enough oiling so some guys are running an extra quart or two of oil in them. Maybe that is what you where referring to. I always pull in OD with my 5600, but I do not pull as often as you though.