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  #1  
Old 01-02-2009, 05:48 PM
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Location: Locust Grove,GA
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rearend

how can i tell what rearend i have?

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  #2  
Old 01-02-2009, 06:27 PM
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what kind of truck, year etc.....
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  #3  
Old 01-03-2009, 10:01 AM
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its a 2004 ford f 150 supercrew 4x4 lariat.
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  #4  
Old 01-03-2009, 10:30 AM
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4.6 = 8.8
5.4 = 9.75

Phil
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  #5  
Old 01-03-2009, 11:11 AM
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Im sorry i wanted to find out what gear i have 3.55 or what ever.it has the 5.4
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  #6  
Old 01-03-2009, 01:36 PM
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on the rear end there is a tag. it will say 3 55 or 4 10 or 3L55 for a locking rear etc....
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  #7  
Old 01-03-2009, 02:49 PM
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thanks it said 3L73 is that good with 315/70r17

Last edited by RoushRich; 01-03-2009 at 02:53 PM.
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  #8  
Old 01-03-2009, 04:06 PM
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You have 3.73 gears with a limited slip.
Should be fine with your tires depending on your usage. You'll lose some power (towing would be affected a bit for sure) but lots of people run 35's on 3.73's, and some on 3.55's.
If you really pull a lot of weight around or you are concerned more about losing power, go with a 285 or a 33x12.50r17.

I always plan to re-gear when I buy new tires though. You can get away without, but it is so nice to get the engine back in the correct RPM range and gain the power back, and then some. Makes me feel better about the automatic transmission too. It's spendy though, around $1100-1500 depending on the shop. I'm putting 35's on with 3.73's but I will eventually re-gear when my wallet permits.
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Last edited by brianjwilson; 01-03-2009 at 04:09 PM.
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