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  #1  
Old 05-23-2012, 12:44 PM
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Linne Linne is offline
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What gear ratio with 39,5" pitbull rockers?

I need to put new gears in soon, so I can run my new tires.
Would 4:56 be enough? when tires are 39,5" x 16,5" and rim 16"

Please don't say anything about Dana 50 weaknesses I know all that!
I will try to find a D60 King pin axle.

My truck is a 7.3 Powerstroke automatic and 4x4

Here is some pics, I will be putting cut-out fenders and move the front bumper a bit forward, then I also get space for the front winch behind the front bumper
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Old 05-23-2012, 12:55 PM
cbzdel cbzdel is offline
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Cant help you with the gears but that will be one nice looking rig
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Old 05-23-2012, 01:58 PM
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Cant help you with the gears but that will be one nice looking rig
Thanks
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Old 05-23-2012, 05:29 PM
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You can figure it out yourself with the automotive calculators on this site.

Automotive Calculators offer to you by Ford Trucks Enthusiasts | www.ford-trucks.com

Assuming your stock tires were 32 inch and your differential ratio is 3.73, you are running an effective ratio of 3.02. You need a 4.60 to return your gearing to stock. Since the tires have a larger rotating mass, I would consider a 4.88 ratio to compensate.
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Old 05-24-2012, 12:35 AM
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Thank you redford that's the most useful link I have seen in long time
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Old 05-24-2012, 07:03 AM
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Thank you redford that's the most useful link I have seen in long time
You are very welcome, Linne. You have a great looking truck.
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Old 05-24-2012, 11:29 AM
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Can't wait to see the finished product!
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Old 05-24-2012, 12:25 PM
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Can't wait to see the finished product!
Let's hope I get the gears an cut out fenders soon, I think it will take a few months, I also need new rims. Only problem is everything gets so expensive when all parts needs to be ordered from USA to Finland it's not only the shipping but also that 23% of taxes that the customs add to everything...

But hey If you really want it, then it's worth it.
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Old 05-24-2012, 01:06 PM
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Let's hope I get the gears an cut out fenders soon, I think it will take a few months, I also need new rims. Only problem is everything gets so expensive when all parts needs to be ordered from USA to Finland it's not only the shipping but also that 23% of taxes that the customs add to everything...

But hey If you really want it, then it's worth it.
I completely understand... I wanted an exhaust system from a company in Italy for my 2006 Suzuki GSXR-750. The purchase price was fine but the shipping and especially the US customs fees were outragious! I had to pass on the purchase...
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Old 05-24-2012, 01:33 PM
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Will the back of each front tire hit the front of your rocker pannels? Just wandering how it will fit with no lift?
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Old 05-24-2012, 03:03 PM
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there is some kind of lift, I do not know how much exactly but measurements would say it's about 4" in the rear and something 3.25 to 3.75" front and still the front lies much lower than the rear, my tires I now have under are 315/75-16
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Old 05-24-2012, 03:09 PM
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I completely understand... I wanted an exhaust system from a company in Italy for my 2006 Suzuki GSXR-750. The purchase price was fine but the shipping and especially the US customs fees were outragious! I had to pass on the purchase...
It should be all around the world this way: that only if you can buy the same product in your own country then you have to pay taxes and custom fees.
Now we do not have much of a choice here in Finland is almost non parts dealers for American cars, spare parts you can buy but only originals. Noting extra.

The only way to go around this would be to have some one at the other end to buy the item and ship it as a gift, but that does not always work but it's nice when it works.
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Old 05-24-2012, 04:12 PM
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As for new gears, your 1999 F350 came with 32" tires and the 4R100 transmission with the 4th gear having a 0.71 ratio. I assume that you have 3.73 gears in the front and rear axles.

I don't know the speed limits in Finland but here in the US we are allowed to drive up to 70 MPH on highways. So, comparing the OEM 32" tires to the new 39.5" tires, we have the following:

Miles Per Hour: 65
Tire Diameter in Inches: 32
Axle Ratio: 3.73
Transmission High Gear Ratio: 0.71
RPM's: 1,809

Miles Per Hour: 65
Tire Diameter in Inches: 39.5
Axle Ratio: 4.10
Transmission High Gear Ratio: 0.71
RPM's: 1,611

Miles Per Hour: 65
Tire Diameter in Inches: 39.5
Axle Ratio: 4.30
Transmission High Gear Ratio: 0.71
RPM's: 1,690

Miles Per Hour: 65
Tire Diameter in Inches: 39.5
Axle Ratio: 4.56
Transmission High Gear Ratio: 0.71
RPM's: 1,792

Miles Per Hour: 65
Tire Diameter in Inches: 39.5
Axle Ratio: 4.88
Transmission High Gear Ratio: 0.71
RPM's: 1,918

Miles Per Hour: 65
Tire Diameter in Inches: 39.5
Axle Ratio: 5.13
Transmission High Gear Ratio: 0.71
RPM's: 2,016

Miles Per Hour: 65
Tire Diameter in Inches: 39.5
Axle Ratio: 5.38
Transmission High Gear Ratio: 0.71
RPM's: 2,114

The 4.56 gears will put you very close to the OEM setup. However, it does not take into consideration the taller tires and associated increase in rolling mass. I would recommend the 4.88 or 5.13 gears to maintain or enhance the current performance of the engine. New gears are expensive... I would rather have more gear than not enough gear. Use the RPM Calculator link below to adjust for your actual speed limits.

RPM Calculator
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  #14  
Old 05-24-2012, 04:22 PM
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Thank you that's also useful help, our speed limits are about the same, only difference is that you talk about miles per hour and we kilometers per hour.
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Old 05-24-2012, 06:02 PM
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Id go 5.38
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Old 05-24-2012, 06:02 PM
 
 
 
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