Crusing RPM's - Ford Powerstroke Diesel Forum
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Old 08-24-2010, 08:00 AM
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Crusing RPM's

I've got a 2000 F350 with the 7.3 and a automatic, at 70mph I'm running just below 2400rpm is that about right? It sounds a little high while I'm in the truck but it could be that I'm just not used to driving diesels. Just wondering what everyone else was running.
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Old 08-24-2010, 08:41 AM
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You must have 4:10's. That would be about right.
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Old 08-24-2010, 09:58 AM
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Quote:
Originally Posted by burrfree View Post
You must have 4:10's. That would be about right.
i dont suppose that Ford would have been kind enough to put a tag on the rearend that tells you what ratio it is would they? Guess I'll go out and take a look
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Old 08-24-2010, 10:25 AM
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my truck runs right about 2000 @70mph I want a gear vendor, maybe I could get it to around 1600rpm..
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Old 08-24-2010, 10:26 AM
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Yes there should be a tag on the rear end passenger side of the differential, this will state the original gear ratio, the tag on the drivers side says synthetic lube....Fred
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Old 08-24-2010, 12:14 PM
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I ran about 2400 the other day pushing 78-80.
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Old 08-24-2010, 12:17 PM
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Gear Calculator USE THIS TO HELP YOU OUT
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Old 08-24-2010, 12:19 PM
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4R100

Gear 1 2 3 4 R
Ratio 2.71:1 1.54:1 1:1 0.71:1 2.88:1

5R110

Gear 1 2 3 4 5 R
Ratio 3.11:1 2.22:1 1.55 1:1 0.71:1 2.88:1

5 Speed Manual

Gear 1 2 3 4 5 R
Ratio 5.72:1 2.94:1 1.61 1:1 0.76:1 5.24:1

ZF S6-650 transmission

Gear L 1 2 3 4 5 R
Ratio 5.79:1 3.30:1 2.10 1.30 1:1 0.72:1 5.24:1

HERE ARE YOUR TRANNY SPECS
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Old 09-06-2010, 01:28 AM
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My 99 with 3.73 auto runs at 2k @ 70 mph
My 97 with 4.10 auto ran at 2200-2300 @ 70mph

Our 88 with 3.55 manual runs at 2200-2300ish @ 70mph
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Old 09-06-2010, 12:48 PM
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Just a reminder ... tire diameter comes into the equation ... as well as whether or not the speedometer has been recalibrated for a non-stock tire size.
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