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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

F350 diff ratios

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Old Jun 1, 2018 | 09:51 AM
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F350 diff ratios

Ok this has probably been asked b4 just climed under my f350 to see what diff ratio are under it and the tags are gone and i dont know what ratio it has dose any one know what it should have

it is a 5ltr efi windsor with a 4 speed manual and is 4x4 non duelie just trying to work out how many revs it will be doing at 110km/h about (70miles/h)
thx in advance
 
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Old Jun 1, 2018 | 10:47 AM
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Can you post up a picture of the certification sticker in the door jamb as it will give use a lot more information to go on.
Dave - - - -
 
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Old Jun 1, 2018 | 05:56 PM
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Ok will get them in a min not sure if they will help much as they are australian and the numbers dont match the american numbers
 
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Old Jun 1, 2018 | 07:21 PM
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Being Austrailian, that might explain the 5 liter engine in a f350. Ford did install our 302 in the lighter duty f250's which is somewhat interesting in itself. I always felt the 302 was a bit too small for the f150.

If the numbers are going to do no good, and you do not have the tags, the only sure fire way I know is to jack up both rear tires, and get someone to help you turn both rear tires 1 revolution, while watching the driveshaft(you might want to mark the shaft).

Over here, the most common ratios for 4x4 f350's are a 3.55 or a 4.10. So when you turn both tires 1 turn, and the shaft turns about 3 1/2 turns, you know you have a 3.55. If it turns 4 turns, you know you have a 4.10. I believe they did have a 4.56 and the 2wd trucks had some lower ratios, like a 3.08 which would be 3 turns of the driveshaft.
 
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Old Jun 1, 2018 | 07:32 PM
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Ok rhx sorry is the 5 ltr but a 302 is 4.9 so not much in it
 
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Old Jun 1, 2018 | 07:39 PM
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Over here, the 300 six is called a 4.9 liter, and the 302 is called a 5.0 liter. The 351w is called a 5.8 liter. Just in case you are reading something from over here and get confused.
 
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Old Jun 1, 2018 | 07:40 PM
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I will mark the rail shaft tonight and look and yes this 350 was factory with the 302 i believe that is why it has the 4 speed and was not aware that u guys did not put it in the bigger trucks so as for diff ratios it could have any thing in it thx for the help
 
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Old Jun 1, 2018 | 07:52 PM
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Originally Posted by Franklin2
Over here, the 300 six is called a 4.9 liter, and the 302 is called a 5.0 liter. The 351w is called a 5.8 liter. Just in case you are reading something from over here and get confused.
Ok thx makes sence
 
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Old Jun 2, 2018 | 10:40 AM
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Originally Posted by Sleepster217
Ok will get them in a min not sure if they will help much as they are australian and the numbers dont match the american numbers
Well being down under could make it ruff as you said the numbers don't match.
DaveF has it under control on helping you.
Dave ----
 
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