How do I figure out what gear ratio I have?

**kinghawg98** · #1 (**permalink**) 11-28-2007, 05:04 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, 05:07 PM

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

**kinghawg98** · #3 (**permalink**) 11-28-2007, 05:37 PM

was 4.23 an option?

Thats what I could deciper from the little tag

**SMKSTAX** · #4 (**permalink**) 11-28-2007, 05:43 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, 05:52 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, 05:57 PM

Did they come with anything other than a 3.73 stock?

**SMKSTAX** · #7 (**permalink**) 11-28-2007, 06:01 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, 06:13 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, 06:18 PM

D1 comes up as a limited slip 3.73.

**kinghawg98** · #10 (**permalink**) 11-28-2007, 06:30 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.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode