Gear ratio question - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 02-19-2010, 07:49 AM Thread Starter
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Gear ratio question

Im wondering what for a gear ratio i should switch my 04 f350 to. im currently running 3:73s and 315/75/16 toyo mts and im putting on a set of 38/13/16 michelin xmls. the truck is a daily driver as well as i use it for work pulling cattle trailer with atleast 10-15000lbs loaded so i need this truck to be able to do this once i swap the tires. also the michelins are almost double the weight as they weigh 115lbs and the toyos are only around 70lbs. any input and advice is much appreciated
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post #2 of 4 Old 02-19-2010, 09:34 AM
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4.30s or 4.56


04 f350
03 turbo sct with loone tune
arp studs Sinister Diesel EGR Delete
ran a 8.78 in 1/8
full suncoast trans with billet converter and input shaft
4" ss turbo back bullydog 4" to 6" mrbp tip
8" procomp ,procomp tracion bars on 20x12 35"
3.73 gears and trutrac
volant intake
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post #3 of 4 Old 02-19-2010, 10:00 AM
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I am planning to go with 4.56's. As soon as I wear out my 35's I will be replacing them with 37's and all the research I have done only shows a 100 rpm difference between 4.30's and 4.56's. So I would recommend 4.56's with 38's especially if you plan to tow. I have also decided to get my setup from randys ring and pinon, they seem to be very knowledgeable and prices seem to be good also.


Michael
2004 F-250 lariat 4x4

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post #4 of 4 Old 02-19-2010, 10:59 AM Thread Starter
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yah im leaning more towards the 4:56s to make sure i keep my power up im hopeing to find some from a wrecker and swap them or a good place on the internet that might swap.
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