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I'm most familiar with 5 speeds since I haven't yet owned a 6 speed truck. Having been around a number of forums since buying my truck 10 years ago, I have read and heard numerous stories of guys destroying their 5 speeds by running too low an rpm. Either guys short shifting and running around at low rpm, to guys running an aux overdrive on the interstate. The Getrag has a bad reputation due to many being incorrectly set-up from the manufacturer, but they also crap counter shaft bearings as a common failure. The getrag should also be overfilled by about a quart to keep the front bearing happy as well. The NV4500s have 5th gear problems. No matter what manual you run, they are all VERY expensive to repair. I choose to keep my trans as happy as possible by keeping the rpm up rather than lug it. My original getrag has over 185k on it so I feel whatever I'm doing must be ok.
Travis..
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