How do I figure out what gear ratio I have?

kinghawg98 · #1 (**permalink**) 11-28-2007, 06:04 PM

03 F350, 6.0L 4wd

Everything seems to be stock, I have no way to get it up in the air right now (for a few days), but need to know the rear end ratio

Is there a code somewhere? Or they were all sold with x.xx?

It does not have a towing package to my knowledge....would the VIN help?

**SMKSTAX** · #2 (**permalink**) 11-28-2007, 06:07 PM

There should be a tag on the diff and it will tell you the ratio.

kinghawg98 · #3 (**permalink**) 11-28-2007, 06:37 PM

was 4.23 an option?

Thats what I could deciper from the little tag

**SMKSTAX** · #4 (**permalink**) 11-28-2007, 06:43 PM

Hmmmm never heard of a 4.23. Was that the only numbers on there? For example I think a 3L73 is a 3.73 limited slip. Did you see anything resembling that?

kinghawg98 · #5 (**permalink**) 11-28-2007, 06:52 PM

Sadly, no...no recognizable rear end ratios on there..

There is a V 423 and a 73 10 5 3D25

kinghawg98 · #6 (**permalink**) 11-28-2007, 06:57 PM

Did they come with anything other than a 3.73 stock?

**SMKSTAX** · #7 (**permalink**) 11-28-2007, 07:01 PM

I believe they also came with 4.10's. Is there an axle code on the inside drivers door certification plate?

kinghawg98 · #8 (**permalink**) 11-28-2007, 07:13 PM

D1 is the axle code.

The reason for all this madness- I just got a livewire and Vivian @ DJs needs the info for my tunes...exciting!

**SMKSTAX** · #9 (**permalink**) 11-28-2007, 07:18 PM

D1 comes up as a limited slip 3.73.

kinghawg98 · #10 (**permalink**) 11-28-2007, 07:30 PM

Thanks dude!

I'm sending her the email now. Hopefully I'll have some tunes on by end of day tomorrow....now the only hard part is picking which ones to use! haha.

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