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2007-2008 S331 Sportruck For discussion of the F-150 platform "Thunder."

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  #1  
Old 02-04-2010
Great White North Great White North is offline
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Default Changing rear differential gear ratio?

I own a 2007 S331 truck and want to change the gear ratio from the stock 3:73 to 4:56.I do not race this truck but want more bottom end power.I have just recently added an electric fan kit, and the JDM super tune.
I am concerned with high RPM'S with every day driving in the city and or highway.

Has anyone done this modification, if so i would appreciate positive and or any negative feedback.

Regards,

Great White North
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  #2  
Old 02-05-2010
wpgfordguy wpgfordguy is offline
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i would suggest that 4.30 is a far as you want to go.
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  #3  
Old 02-06-2010
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2007SaleenS331 2007SaleenS331 is offline
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I have 4.56 gears in my 2007 S331 and I consider it the best modification that I have done to this truck. At 75 mph it tachs about 2600 rpm. With this gear change, there isn't that gear hunting back from overdrive to third gear like it does with the 3.73 ratio. It makes the truck feel lighter then it is and has good bottom end performance with these 23 inch wheels and tires.
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Old 02-12-2010
SoKleen SoKleen is offline
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my truck has 60k miles on it and I just got some 4.56 gears to put in. do I need to put in any kind of rebuild or master rebuild kit when I do it? and what kind of rear end gear oil you guys suggest?
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Old 02-12-2010
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2007SaleenS331 2007SaleenS331 is offline
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Quote:
Originally Posted by SoKleen View Post
my truck has 60k miles on it and I just got some 4.56 gears to put in. do I need to put in any kind of rebuild or master rebuild kit when I do it? and what kind of rear end gear oil you guys suggest?
I would install the gears with a new bearing kit and new axle seals. You should get a shim kit for setting up the ring and pinion. The master rebuild kits will come with a shim kit. I would use the Ford synthetic gear lube with 2 little containers of friction modifier for the limited slip differential. Another good gear lube choice would be Mobile 1 or Amsoil synthetic. I had 4000 miles on my S331 when I installed the 4.56 gears and we rebearing it.
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Old 02-24-2010
SoKleen SoKleen is offline
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how much is a rebuild kit and what kind and where do I get one?
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  #7  
Old 02-24-2010
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2007SaleenS331 2007SaleenS331 is offline
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I would recommend a Yukon 4.56 ring and pinion set which was $285 my cost and a Yukon bearing/shim kit which was $197 my cost with $28 shipping from our supplier. The bearing kit comes with the good Timken bearings, too. And I would recommend installing Ford axle seals which were $16 and 2 little bottles of friction modifier for the gear lube was $9. I work at a transmission rebuild center and we, also, rebuild differentials and transfer cases.
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Old 03-01-2010
SoKleen SoKleen is offline
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So, how much for the rebuild kit, axle seals, and the ford friction modifier shipped to 75503? can you take paypal?
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  #9  
Old 03-01-2010
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Quote:
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So, how much for the rebuild kit, axle seals, and the ford friction modifier shipped to 75503? can you take paypal?
Sent ya a PM.
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  #10  
Old 02-20-2011
Saleen190 Saleen190 is offline
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Quote:
Originally Posted by 2007SaleenS331 View Post
I would recommend a Yukon 4.56 ring and pinion set which was $285 my cost and a Yukon bearing/shim kit which was $197 my cost with $28 shipping from our supplier. The bearing kit comes with the good Timken bearings, too. And I would recommend installing Ford axle seals which were $16 and 2 little bottles of friction modifier for the gear lube was $9. I work at a transmission rebuild center and we, also, rebuild differentials and transfer cases.
I'm In the market for gears and was wonderng if you still are able to get these parts at these prices and also if you carry Motive gears or just the Yukon? I've heard positive and negAtive on both. What are your thoughts on them? Tha ks
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Old 02-20-2011
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Quote:
Originally Posted by Saleen190 View Post
I'm In the market for gears and was wonderng if you still are able to get these parts at these prices and also if you carry Motive gears or just the Yukon? I've heard positive and negAtive on both. What are your thoughts on them? Tha ks
Sent ya PM
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  #12  
Old 02-21-2011
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2007SaleenS331 2007SaleenS331 is offline
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Hey Saleen190...you need to make room in your mailbox so I can seen ya a PM. It is full according to my message box.
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  #13  
Old 02-21-2011
Saleen190 Saleen190 is offline
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Quote:
Originally Posted by 2007SaleenS331 View Post
Hey Saleen190...you need to make room in your mailbox so I can seen ya a PM. It is full according to my message box.
Just took care of it. Sorry bout that.
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  #14  
Old 08-12-2012
haulin S331 haulin S331 is offline
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What is the best maker/brand ?
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  #15  
Old 03-29-2020
MarilynsUnicorn MarilynsUnicorn is offline
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Did you install the gears? How she run?
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