What rear end gear in my 04 f350 - Ford Powerstroke Diesel Forum
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Old 12-09-2012, 09:34 AM
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What rear end gear in my 04 f350

Can anyone tell me what gear is in my 04 f350 CC SRW. Or how I can find it

Last edited by Locke6169; 12-09-2012 at 09:40 AM.
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Old 12-09-2012, 10:59 AM
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From the factory there is a tag on the rear diff that will have the ratio embossed in it. The retaining bolt may obstruct your view. "3 73" would indicate a 3.73 open differential, 3L73 would indicate a 3.73 with a Traction Lock limited slip differential.
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Old 12-09-2012, 12:20 PM
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Or on door pillar. I suggest finding it underneath as a get to know your truck better method.
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Old 12-14-2012, 12:47 PM
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I checked my door pillar and nothing. There are two metal tags on my rear differential one says "? Oil only" the other has something to the effect of "4A23"
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Old 12-14-2012, 12:50 PM
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you need to clean those tags better "oil only " is likely synthetic 75-140 oil only and will have a LS for limited slip and the gear ratio also
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Old 12-14-2012, 12:52 PM
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Try removing and cleaning the second tag. The first tag is just lube recommendations. Sometimes the bolt is blocking the important information on the 2nd tag.

Oh yeah, if you're reading 70 on the speedo and 2000 on the tach, you've got a 3.73. More RPM at 70 would be a 4.11 or a 4.30. Although I doubt that there is a 4.30 in an F350, F450, but not an F350.
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Old 12-14-2012, 12:55 PM
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I was typing what they said from memory. I just snapped some pics of the tags. I'll try and post them
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Old 12-14-2012, 12:59 PM
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One says "140 synt oil only" the other "V 423 F 10 5 4A23"
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Old 12-14-2012, 01:06 PM
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i bet there is a 75 in front of that 140
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Old 12-14-2012, 01:15 PM
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