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1957 - 1960 F100 & Larger F-Series Trucks Discuss the Box Style Ford Trucks

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Old 11-01-2013, 04:58 PM
richardbrust richardbrust is offline
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Rear Axle Ratio and Transmission

I have a 1960 F250 with a 4-speed - engine is 292 if that matters. Never use 1st, start in 2nd, and am in 4th in no time. Seems like 40mph is pushing to the limits of this beast.

So I did some research on rear axle ratios, and I believe I understand that concept. What I don't understand is if I change the rear end, and drop it down to a 3.73 or something similar, what effect, or limitation, will the current transmission have? (don't know the details of the current tranny).

Is there some info/sites on the relationship between the two. I seem to have found the rear end info easily enough, just not both together. Thanks!

additional info:
  1. currently having new front end put on, will change from 8 lug to 5. I say this because I'd like to have them all 5 lug now anyway, so rear end change is on the "to-do" list.
  2. Have been told Ford 8.8 5x4.5 bolt pattern is the way to go, will add disc brakes as well.
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Old 11-01-2013, 05:16 PM
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Maltman Maltman is online now
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do you have a tach to see what RPM's you are turning at that speed?
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Old 11-01-2013, 05:58 PM
richardbrust richardbrust is offline
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no, I'm guessing on speed even. Fuel gauge works, that's about it
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Old 11-01-2013, 06:02 PM
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haha, right on man! Have you tried to see what gear ratio you have now? you tube has videos...
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Old 11-01-2013, 06:31 PM
richardbrust richardbrust is offline
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Current ratio is 4:11. Thanks much...
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Old 11-02-2013, 06:55 PM
deyomatic deyomatic is offline
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Get a tach and see what you're spinning. I'm guessing the tranny is manual. The only issue I ever had with swapping gears to higher ones (I went from 3.89 to 2.90) was that I had to slip the clutch more to get the car moving. Maybe that was just too high for the weight of the car. Not sure. Play around with the gearing calculators online. Richmond gears has a good one, 4.11 to 3.73 may not be a big enough difference for you.
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Old 11-05-2013, 12:48 PM
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1960 F250. You might have the 4.56 gears. What is your axle code on the rating plate? No matter whar rear gears, and F100 or F250, the 4 speed transmission was the same (Warner T98A). Changing axle ratio will have no effect on transmission. What ratio to use depends on how you will use the truck. You have a low enough first gear to get an empty truck rolling with any sane axle ratio.
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Old 11-06-2013, 12:16 PM
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Which front end are you using? That will make a difference as to bolt pattern. Standard Ford F 100 is a 5X5.5 until, IIRC, '96. Cars of the same period were 5X4.5. I think it changed to metric in '96 for both cars and trucks.
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Old 11-06-2013, 12:16 PM
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