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Generation 4 1961-1966 F100, F250, F350

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  #1  
Old 12-22-2017, 11:52 PM
tigger77 tigger77 is offline
 
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too tall rear gear

my truck can barely hit 50 mph before it sounds like it's winding the seeds out of the 223.
I'm guessing it's a factory 411.
Does anyone have any suggestions on different ratio? it is NOT a hauler........
its a couple times a month driver and I'd like to do at least 60 without it sounding like it's going to blow.
thanks!
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Old 12-31-2017, 10:54 AM
kdog kdog is offline
 
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Gears.

Anything in the 3-3.5 to 1 ratio should be an improvement. Additional tweaks can be done with tire sizes. If you plan to keep the truck for more than a little while you might want to consider a modern upgrade to an overdrive. Although there really isn't a cheap way to approach this... drivability will be greatly improved. Otherwise they are great grocery getters and will probably be more fun as a cruiser around town.
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Old 01-02-2018, 10:55 PM
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BKW BKW is offline
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Quote:
Originally Posted by tigger77 View Post
my truck can barely hit 50 mph before it sounds like it's winding the seeds out of the 223. I'm guessing it's a factory 4.11.

Does anyone have any suggestions on different ratio? it is NOT a hauler. It's a couple times a month driver and I'd like to do at least 60 without it sounding like it's going to blow.
AXLE code stamped on the 2nd line-far right of the Warranty Plate, riveted to the left door face below the latch.

Post what the code is.

Common ratios with Ford 9" rear axle w/3 speed M/T: 3.70-1 & 3.89-1
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