Rear gear???? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 01-26-2011, 12:45 AM Thread Starter
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Rear gear????

The consensus seems to be on most of these forums is that it's 2000 rpm at 70mph with 373's. But I'm lookin for that dead ringer guy to say my truck is just like yours and it does 70 at 2000. My truck is goin under the knife on Friday and having the 410's removed and replaced with 373's. 410's are 2450 at 70mph. Anyone have a truck like mine or close to it to calm my $900 nerves? 1999 F350 PSD Crew Dually 2WD 6 speed manual.
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post #2 of 2 (permalink) Old 01-27-2011, 09:19 AM
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Quote:
Originally Posted by shoaboat View Post
The consensus seems to be on most of these forums is that it's 2000 rpm at 70mph with 373's. But I'm lookin for that dead ringer guy to say my truck is just like yours and it does 70 at 2000. My truck is goin under the knife on Friday and having the 410's removed and replaced with 373's. 410's are 2450 at 70mph. Anyone have a truck like mine or close to it to calm my $900 nerves? 1999 F350 PSD Crew Dually 2WD 6 speed manual.
I think I was at 1800-1900 r's with 3.73 and a 6 speed, why go with 3.73? If your empty or light most of the time I would run 3.55.

http://www.gearvendors.com/f2wdt.html

according to the Gear vendor Chart (link above) 3.73 should get you 637 RPM lower in 6th gear (if I did my calculation right)

3.55 should lower the r's 955 rpm

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