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7.3 OBS PSD 94-97 PowerStroke Discussion

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Old 08-06-2016, 09:55 AM   #1
RonA
 
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Good rear axle ratio no towing.

I have a '95 F350 (7.3) and have been thinking about getting an F250 bed and rear end to get rid of the dual wheels. Does the 3.5 ratio rear get any better mileage than the 4.1? I get 17-18 now and a bit better would be nice.
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Old 08-08-2016, 12:01 PM   #2
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I like 3.54's for daily driving more than I ever liked the 4.10's. I'm not as happy with 3.31's for daily city driving, but if I'd do mostly highway I pick up 2-3MPG.
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Old 08-08-2016, 12:23 PM   #3
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~3.50 is a great daily driver on 35's or smaller. There are so many variables in MPG, but you'll likely see an increase if you're doing more than city driving.
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Old 08-08-2016, 01:43 PM   #4
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It seems better in my truck. 4th gear runs about the same rpm/mph with 3:55 as 5th & 4:10's did.
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Old 08-08-2016, 03:24 PM   #5
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With the auto trans and 215/85 R16 tires I see around 2250 rpm or so at 65 on the speedo(around 63 mph). Not sure where the sweet spot rpm wise is on these 7.3's.
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Old 08-08-2016, 03:54 PM   #6
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3.55 is a much better gear unless you're towing heavy.

The 3.42s in my dodge allow for 1600rpms at 75mph.
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Last edited by AHall; 08-08-2016 at 03:55 PM.
 
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