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Author Topic:   Tire swap
68 S-code GT
Gearhead

Posts: 980
From: Sayreville, NJ, US
Registered: Mar 2000

posted 06-08-2003 07:59 AM     Click Here to See the Profile for 68 S-code GT   Click Here to Email 68 S-code GT     Edit/Delete Message   Reply w/Quote
My 99 F150 came with P235/70/16 tires on it and I was thinking of upgrading to a LT245/75/16 AT tire. Will the difference in height throw my speedometer of much? As far as I can tell it would be a change of about 1.5-2 in diameter.

------------------
Ed S.

68 S-code FB GT 4spd(now C6)/3.25 PS PDB
68 J-code(now 289) Cp Sprint"B" C4/3L00-9" PDB PS AC
99 F150 XLT Ext/cab, 4X4, 5.4L, 3L55
95 Exploder XLT with the works! (Wife's car)

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MLariviere
Moderator

Posts: 3255
From: Biddeford,Me.USA
Registered: May 99

posted 06-08-2003 10:13 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
Yes,it will . You'll gain a few mph at highway speeds.

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68 S-code GT
Gearhead

Posts: 980
From: Sayreville, NJ, US
Registered: Mar 2000

posted 06-08-2003 10:57 PM     Click Here to See the Profile for 68 S-code GT   Click Here to Email 68 S-code GT     Edit/Delete Message   Reply w/Quote
Is there a formula use or should I just calculate by association?

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MLariviere
Moderator

Posts: 3255
From: Biddeford,Me.USA
Registered: May 99

posted 06-09-2003 10:19 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
Here's a link to Randy's Ring&Pinion. http://www.ringpinion.com/calculators.shtml Just pulg in what you have,and see what you get. I would say about 4-5 [email protected]

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68 S-code GT
Gearhead

Posts: 980
From: Sayreville, NJ, US
Registered: Mar 2000

posted 06-09-2003 11:11 PM     Click Here to See the Profile for 68 S-code GT   Click Here to Email 68 S-code GT     Edit/Delete Message   Reply w/Quote

THANKS

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