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.
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"
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.
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.
The reason I need the rear gear is so I can send it to Vivian before I order my tuner. So I guess my next move would be to pull the bolts out of the tags and see if they are blocking anything? If its not there do I have any other options
I'm not 100% sure, but I think that 3 on the bottom picture is the beginning of your gear. Unfortunately, I threw mine out when I did my aluminum diff cover. Your gear choices are 3.73, 4.10, & 4.30. I would take it off, take a wire brush to it, even look at the back side.
The reason I need the rear gear is so I can send it to Vivian before I order my tuner. So I guess my next move would be to pull the bolts out of the tags and see if they are blocking anything? If its not there do I have any other options
pretty sure only way to get 4.10's was to get a DRW. 4.30's were for the Tow Boss trucks only.
Jason
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