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Old 01-22-2014, 02:08 PM
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dana 60 swap gear ratio

I have a 1996 f250 psd 4x4. I have an opportunity to picck up a complete dana 60 out of a 1990 f350 with a 3.54 ratio. My rear axle is a 3.55. The question is, do i need to change the 60's gears to match or is .01 gonna be a big deal. Thanks
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Old 01-22-2014, 02:10 PM
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It will work. It's eventually the same
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Old 01-22-2014, 02:42 PM
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Dana didn't make a 3.55 so all 4x4 trucks with a 3.55 rear have 3.54 front
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Old 01-22-2014, 02:47 PM
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Ok, thanks. Next question, the stock shock mounts for my truck will work for the 60 right?
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Old 01-22-2014, 05:03 PM
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Quote:
Originally Posted by dieselup89 View Post
Ok, thanks. Next question, the stock shock mounts for my truck will work for the 60 right?
The noun that is bolted to the frame? YES

The mount that bolts to the axle? Drives side bump-stop tab MAY need to be trimmed
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Old 01-22-2014, 06:02 PM
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Quote:
Originally Posted by dieselup89 View Post
I have a 1996 f250 psd 4x4. I have an opportunity to picck up a complete dana 60 out of a 1990 f350 with a 3.54 ratio. My rear axle is a 3.55. The question is, do i need to change the 60's gears to match or is .01 gonna be a big deal. Thanks

The real reason a front axle is different by a small amount is because you need the front to pull just a touch to make it work right if the were identical the 4wd wouldn't function correctly.


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Old 01-22-2014, 08:56 PM
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Thats what i needed to know. Thanks for the help
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Old 01-22-2014, 09:08 PM
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Actually if the front is 3.54 and the rear is 3.55 it's pushing more with the rear then the front is, however it being marginal it is still pushing more then pulling
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Old 01-22-2014, 10:28 PM
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A LOWER diff ratio turns the tire FASTER. (Example: two trucks, same tranny, top gear, same RPM, the 3.55 truck is going down the road faster than the 4.10 truck.) So yeah, the front will be turning about 0.28% faster than the rear. I always thought it was just a random result of Dana's choice of ring and pinion gear teeth vs. Sterling's; didn't realize it was for a specific purpose. This, of course, also illustrates why you should NOT proceed down the road on dry pavement in 4x4 for very long.
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