1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage

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differential change

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Old

Nov 12, 2005 | 01:28 AM

#1

new guy

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Question

differential change

I have just changed the differential on my 98 f150 from a 308 to a 373 and my speedometer is way out of whack what is my next step?

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Old

Nov 12, 2005 | 11:49 AM

#2

bremen242

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Joined: Jan 2002

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From: GANS

Not sure about the '98s, I know my '00, they just reprogrammed the dash. I think the '98s are the same, if not, you will have to change the speedo gear..

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Nov 12, 2005 | 01:57 PM

#3

BLK94F150

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Joined: Sep 2002

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From: None of your business

You have to get a new speedo gear for the 97s and 98s. The 99+s have the all electronic dash that can be programmed.

Mike

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Old

Nov 15, 2005 | 01:47 AM

#4

Fasterhorses

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Joined: May 2004

Posts: 191

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From: San Diego, CA

This is another possibility
http://www.bluegauges.com/prod_yellow_box.htm

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Old

Nov 16, 2005 | 04:05 PM

#5

krunker

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Joined: Feb 2004

Posts: 146

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From: LaGrande, OR

I got a gear off of steeda.com that fit my 97.

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Old

Jan 24, 2006 | 11:16 PM

#6

mrsteveo19761982

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Joined: Dec 2005

Posts: 48

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From: Big Rapids MI

If you have an automatic you can change the gear, if you have a stick you will have mag pickup type sensor and you will have to reprogram the computer.

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