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  speedo change

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Author Topic:   speedo change
jjy
Journeyman

Posts: 22
From: bedford, pa 15522
Registered: Apr 2001

posted 04-11-2001 10:38 AM     Click Here to See the Profile for jjy   Click Here to Email jjy     Edit/Delete Message   Reply w/Quote
i just recently put 3.89 gears in my mustang, and now of course, the speedo reads 90 mph when i'm doing probably 45. how does one get an accurate speedometer back? thanks,
jesse

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Moneymaker
Administrator

Posts: 27660
From: Lyons, IL, USA
Registered: May 99

posted 04-11-2001 10:49 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
You need to replace the plastic speedo gear on the transmission mainshaft. The FRPP cataloge list them and has the formulas for different ratios.

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Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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jjy
Journeyman

Posts: 22
From: bedford, pa 15522
Registered: Apr 2001

posted 04-11-2001 01:03 PM     Click Here to See the Profile for jjy   Click Here to Email jjy     Edit/Delete Message   Reply w/Quote
what's the FRPP? where do i get a catalogue?
thanks,
jesse

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MrWesson22
Gearhead

Posts: 1286
From: Dacula, GA
Registered: Sep 2000

posted 04-12-2001 01:42 AM     Click Here to See the Profile for MrWesson22   Click Here to Email MrWesson22     Edit/Delete Message   Reply w/Quote
ford racing performance parts... local dealership, ford oriented speed shops would have catalogs.

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Neal
Member #723 (M&M rookie)
[email protected] AIM: MrWesson22

69 Gulfstream Aqua Grande
351C/Toploader 4sp
back in commission =)

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Bob429
Gearhead

Posts: 471
From: Watervliet,MI,USA
Registered: Jun 99

posted 04-12-2001 09:05 PM     Click Here to See the Profile for Bob429   Click Here to Email Bob429     Edit/Delete Message   Reply w/Quote
You should consult with a speedometer shop.
You may need a A speedometer gear reducer like what was used on CJ cars for the taller gears.Ford had one for 4:11 and 3:91 's
I see them on "that auction site" from time to time. Bob's Speedometer shop in Michigan
(Adverstised in Hemmings) Gave me friendly advice and makes reducers to order.
Good luck

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Bob
Member#39
71 J code
429 SCJ-R Sportsroof
C6 4:11

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