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post #1 of 25 Old 09-22-2013, 09:14 AM Thread Starter
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gearing change-speedo Q

Im going to pull my f250 axles/springs with 4.10's and put in f350 springs/axles with 3.55's, Question i have is im assuming the speedo drive is in the trans, and set for 4.10's, whats the best way to get it reset so the speedometer is correct with 3.55's?

E-99 F350 XL 2wd reg. cab 7.3 auto trans all stock 226k

1997 F250 XL 4x4 ex-cab, 7.3, ZF-5 trans 4.10 gears, 3" down pipe, 4" exhaust, 5" tip, 150k
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post #2 of 25 Old 09-22-2013, 10:43 AM
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the speedo runs off of the tone ring in the rear. you won't need to do anything

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #3 of 25 Old 09-16-2014, 05:57 AM
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So how do you correct for diff. size tires?

1996 F350 4X4 CCLB SRW
Full Force Stage 1.5-Swamps IDM-Efuel-Bosch 17* HPOP-Melling LPOP-Intercooled-Deleted pedestal-Stancor glow plug relay-1.0 housing-Isspro EV2's-Sky RSK-SD front and rear springs-Tru cool tranny cooler-Built Tranny-CCV mod-6 position chip running TW tunes-6637-3" down pipe to 4" straight pipe-Grab handle mod-Dual lighted visors-3.73 Gears-Warn hubs-SD aluminum rear diff cover-Dual front shocks-295/75/16 Toyo Open Country AT2's
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post #4 of 25 Old 09-16-2014, 06:32 AM
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that is done through the PSOM, the speedometer in the cluster.

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #5 of 25 Old 09-16-2014, 06:33 AM
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PSOM? If I go to 3.73 running my current tire size 295/75/16 I am trying to figure out my rpm at 70 MPH

1996 F350 4X4 CCLB SRW
Full Force Stage 1.5-Swamps IDM-Efuel-Bosch 17* HPOP-Melling LPOP-Intercooled-Deleted pedestal-Stancor glow plug relay-1.0 housing-Isspro EV2's-Sky RSK-SD front and rear springs-Tru cool tranny cooler-Built Tranny-CCV mod-6 position chip running TW tunes-6637-3" down pipe to 4" straight pipe-Grab handle mod-Dual lighted visors-3.73 Gears-Warn hubs-SD aluminum rear diff cover-Dual front shocks-295/75/16 Toyo Open Country AT2's
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post #6 of 25 Old 09-16-2014, 06:36 AM
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RPM = MPH * Gear Ratio * 336 / Tire Diameter

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #7 of 25 Old 09-16-2014, 06:40 AM
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I am not too sure I fully understand.

1996 F350 4X4 CCLB SRW
Full Force Stage 1.5-Swamps IDM-Efuel-Bosch 17* HPOP-Melling LPOP-Intercooled-Deleted pedestal-Stancor glow plug relay-1.0 housing-Isspro EV2's-Sky RSK-SD front and rear springs-Tru cool tranny cooler-Built Tranny-CCV mod-6 position chip running TW tunes-6637-3" down pipe to 4" straight pipe-Grab handle mod-Dual lighted visors-3.73 Gears-Warn hubs-SD aluminum rear diff cover-Dual front shocks-295/75/16 Toyo Open Country AT2's
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post #8 of 25 Old 09-16-2014, 06:49 AM
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(70mph x 3.73 (gear ratio) x 336)/33.49 (tire size in inches) = RPMs

RPMs = 2619

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #9 of 25 Old 09-16-2014, 06:53 AM
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How do I take in account for the PSOM being off?

Right now doing 70 MPH the RPM's are 2250 or so with my 4.10

1996 F350 4X4 CCLB SRW
Full Force Stage 1.5-Swamps IDM-Efuel-Bosch 17* HPOP-Melling LPOP-Intercooled-Deleted pedestal-Stancor glow plug relay-1.0 housing-Isspro EV2's-Sky RSK-SD front and rear springs-Tru cool tranny cooler-Built Tranny-CCV mod-6 position chip running TW tunes-6637-3" down pipe to 4" straight pipe-Grab handle mod-Dual lighted visors-3.73 Gears-Warn hubs-SD aluminum rear diff cover-Dual front shocks-295/75/16 Toyo Open Country AT2's
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post #10 of 25 Old 09-16-2014, 06:54 AM
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BTW that means that at 70 MPH on the speedo I am really doing 75MPH

1996 F350 4X4 CCLB SRW
Full Force Stage 1.5-Swamps IDM-Efuel-Bosch 17* HPOP-Melling LPOP-Intercooled-Deleted pedestal-Stancor glow plug relay-1.0 housing-Isspro EV2's-Sky RSK-SD front and rear springs-Tru cool tranny cooler-Built Tranny-CCV mod-6 position chip running TW tunes-6637-3" down pipe to 4" straight pipe-Grab handle mod-Dual lighted visors-3.73 Gears-Warn hubs-SD aluminum rear diff cover-Dual front shocks-295/75/16 Toyo Open Country AT2's
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