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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.

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  #1  
Old Mon, December 21st, 2009, 02:28 PM
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and what am looking for is only ring and pinion ?
right guys ?
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Old Mon, December 21st, 2009, 02:56 PM
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You are looking for install kits for both front and rear. Also you are looking for ring and pinions for front and rear.

CALL THEM/
EMAIL THEM
They are the experts and they may need some info like your VIN and/or axle tag numbers.
Phone # and contact info is in the link I provided.
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Old Mon, December 21st, 2009, 03:16 PM
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thanx a lot guys i emailed them and will be in touch .. Thanx
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Old Mon, December 21st, 2009, 06:04 PM
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If you have a 3.73 gear now, a 4.56 gear w/38's will achieve roughly the same RPM per MPH as stock.

If you have a 4.10 gear now, a 5.13 gear w/38's will achieve roughly the same RPM per MPH as stock.

A 4.88 gear w/38's will yield roughly the same RPM per MPH as a 3.96 gear ratio on stock tires, and is probably the best combination of pulling and economy. Of course, economy is a relative term as the mass of the rotating assembly is about to be triple or more. Certainly not good for stop & go driving.
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Old Mon, January 18th, 2010, 01:58 PM
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Quote:
Originally Posted by Power Hungry View Post
If you have a 3.73 gear now, a 4.56 gear w/38's will achieve roughly the same RPM per MPH as stock.

If you have a 4.10 gear now, a 5.13 gear w/38's will achieve roughly the same RPM per MPH as stock.

A 4.88 gear w/38's will yield roughly the same RPM per MPH as a 3.96 gear ratio on stock tires, and is probably the best combination of pulling and economy. Of course, economy is a relative term as the mass of the rotating assembly is about to be triple or more. Certainly not good for stop & go driving.
Hi Bill
so you recommend 4.56 if i want the same as stock`s performance with 38`s, but i didn`t understand the 4.88 very clear , can u explain it more please thanx
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Old Mon, January 18th, 2010, 06:23 PM
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Bill was stating that eventhough 4.56 is optimum on paper the 4.88 will help get the bigger tires moving better in the real world abd also will help whenever you pull a trailer.
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Old Tue, January 19th, 2010, 02:06 PM
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Quote:
Originally Posted by 88Racing View Post
Bill was stating that eventhough 4.56 is optimum on paper the 4.88 will help get the bigger tires moving better in the real world abd also will help whenever you pull a trailer.
Thanx for getting it clear for me !
thanx to all
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