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Old 06-22-2016, 01:35 PM   #1
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2002 Ford E350 7.3 Speedometer Calibration for bigger tires

Hi again,

Did a search and came up empty. Looking for a speedometer calibration tool for bigger tires for my van.

Hypertech and Pro Comp don't offer a product for my van.

My speedometer reads about 4mph slower than the actual speed of the van.

What's everyone else doing to fix their speedometer on their old vans?

Thanks.
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Old 06-22-2016, 07:45 PM   #2
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You should ask Agile Offroad or UJOR, they both deal with this issue on regular basis and should have something for you...

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Old 06-22-2016, 10:10 PM   #3
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Running 32in tires, my speedo was way off, but when I changed to 410 gears, it returned to being perfect. Probably not the answer your looking for though. Check with Ujoint, I think he offers something.
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Old 06-22-2016, 11:09 PM   #4
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Thanks for the replies.

John at Agile got back to me. They can do it. Trying to knock it out up here in OC if I can.

Apparently a Ford dealer can do it too: need help with speedo calibration on '03 Excursion 7.3L in San Francisco peninsula - Diesel Forum - TheDieselStop.com
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Old 06-22-2016, 11:35 PM   #5
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this might work too. Does anyone have an AE scan tool?

Auto Enginuity & calibrating speedometer - Ford Truck Enthusiasts Forums
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Old 06-23-2016, 10:29 AM   #6
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Looks like Hypertech tuners list my van as compatible for their tuner but the speedometer calibration feature is unavailable; only works with trucks.

AE got back to me and said they don't offer speedometer calibration for the vans either.

Sct said the same thing for my van.


I think changing the sending unit gear might be the only viable option.
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Old 06-23-2016, 01:48 PM   #7
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If you have ABS, then you should be able to do it through software only.
I believe Autoenginuity software will do it, but it's $$$$.
Dealer should also be able to do it with their software (but finding a dealer that knows how, may be an issue. here is the info). http://www.dieselinnovations.com/tec...Procedures.pdf

There are also a few hardware options that change the electronic pulse reading, is there a reason you use one of those?
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Old 06-23-2016, 02:58 PM   #8
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Van Speedometer Calibration? (Quigley) - Diesel Forum - TheDieselStop.com

Found this thread. I'm in the same boat as the OP in that thread.

3.55, 33" tire.

Pulled out my speedo gear and its exactly the same as OP in that thread, green with 17 teeth. Placing an order for a blue 16 teeth gear. I'll report back when its buttoned up. Its a $4 part FYI. Ford P/N DOAZ-17271-B
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Old 06-23-2016, 05:29 PM   #9
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I'm sure 5-star tuning could do it too, they changed mine with a tune on a Ford truck, but I would definitely go to Agile first, especially if they're local.

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Old 06-23-2016, 10:05 PM   #10
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Apparently with tuners trucks get all the cool features and higher Hp output. Vans are a different animal especially for 2002 and older vans ateast that's what I noticed.
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