What is the most common gear ratio for our trks. - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 10-22-2009, 02:01 PM Thread Starter
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What is the most common gear ratio for our trks.

I checked mine last night & found it to be a 4.10. Is this the most common?
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post #2 of 11 Old 10-22-2009, 02:02 PM
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3.73

If you have 4.10 its prob a dually .
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post #3 of 11 Old 10-22-2009, 02:04 PM
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I have 4.10's but my truck also weights 12,000 every day.

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post #4 of 11 Old 10-22-2009, 02:05 PM Thread Starter
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Its not a dually. 2006 F250 Crew cab FX4.
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post #5 of 11 Old 10-22-2009, 02:09 PM
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I've never seen a single wheel with 4.10 from the factory
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post #6 of 11 Old 10-22-2009, 02:20 PM Thread Starter
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Maybe I'm wrong then. I may have been looking at the wrong chart. What's the best site to get a good code chart?
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post #7 of 11 Old 10-22-2009, 02:22 PM
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Tag on the gear housing will tell you without the code, will be stamped 4.10, 3.73, etc
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post #8 of 11 Old 10-24-2009, 05:43 PM
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The tag on mine is
v 423 F
73 10 5 3E21
So what is mine? I need to know as I may replace with one ton differential

Mike

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stock 170000 miles
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post #9 of 11 Old 10-24-2009, 05:52 PM
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Try this site.
Calulators from www.4Lo.com

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post #10 of 11 Old 10-24-2009, 06:17 PM
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Quote:
Originally Posted by mike517 View Post
The tag on mine is
v 423 F
73 10 5 3E21
So what is mine? I need to know as I may replace with one ton differential
Your missing a couple of characters. In front of the 73 10 F 3E21 there is either one or 2 characters. there will be a 3 or a 3L depending on if it has limited slip or not. So you for sure have 3.73 ratios but you may or may not have limited slip. And you have a 10.5 inch ring gear. The tag should either read 3L73 10 5 3E21 or 3 73 10 5 3E21.

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