Question on rear axle ratio's - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 06-14-2007, 04:23 PM Thread Starter
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Question on rear axle ratio's

Am curious as to what the rev's are at, say, 65mph for the various axle ratios that members have.
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post #2 of 11 Old 06-14-2007, 04:32 PM
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3.55 rears, revvin at 1900 rpm's at 65 mph. 97 F350 stock 5-speed.

RICK


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97 F350 CREW CAB 4x4, 7.3 TURBO DIESEL, DIY INTAKE , TW TUNES
GRAND ROCK POWERFLOW STACK KIT W/5" MITRES
3.55 REARS, 3" DOWNPIPE, FPR SHIMMED WITH GAUGE


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post #3 of 11 Old 06-15-2007, 03:25 AM Thread Starter
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Tnks, anyone with 410?
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post #4 of 11 Old 06-16-2007, 11:18 PM
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Recently had back surgery, so I haven't been driving, but, as I remember 60mph was at 2000rpm and I think 65mph was just over 2100 rpm w/ 4.10 gears & stock tires (DRW).
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post #5 of 11 Old 06-16-2007, 11:23 PM
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I know with my 3:73 gear I run 2 grand at 68 on the highway. 5sp torqueshift auto tranny.

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'06 True Blue/Silver 250 crew cab
ARP's, EGR blocked
AFE stg.2, MBRP 4" pipe
Air Dog 150, ITP reg. return
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post #6 of 11 Old 06-17-2007, 06:27 AM
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with 3.73s

2001 F250 Ext Cab LB 4x4
7.3L PSD, 4R100
Stock except for DIY Tymar intake and 4" exhaust
226K miles and counting!



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post #7 of 11 Old 06-17-2007, 06:30 AM
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, about 2000 at 70, I'm gonna go with as big a tire I can to get my revs down on the highway, hopefully help fuel mileage

Jason
2006 F250 2wd 6.0 psd, 8.96 1/8th mile with canned SCT tunes, now running Spartan Hybrid Race tune! AFE Stage 2 PRO DRY S, 4" turbo back str8 pipe in front of rear tire, auto, crew cab short bed, ZOO DAD mod, 5% tint over the factory tint.
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Reaction---.674
60 ft-------1.892
594 ft------8.370
1/8th ET---8.965
1/8th MPH--75.63

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post #8 of 11 Old 06-17-2007, 06:43 AM
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I have an 06 F-350 DRW with 4:10s, it turns about 2200 @ 65 mph.
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post #9 of 11 Old 06-17-2007, 06:48 AM
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3.73's here and im at about 2,000 RPM tight at 68-70 MPH.

Early 99 F-350
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-Jake
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post #10 of 11 Old 06-18-2007, 03:35 PM Thread Starter
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Thanks everyone. What is the consensus on just how many more mpg approx 200 or so fewer revs would add, 1, 2??
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