Here's how to look up your axle code

[Motown Fire]

Here's a link to lookup your axle code from the sticker on the B post of your cab.

Automotive What is my Ford rear end ratio, do I have positraction

[WD40]

Thanks very much.

[F-350MAN]

Good Info !!!!!

[CLIPPERS]

THANK YOU!!!

[Rob'Z]

My manufacture tag reads "axle" and directly above reads "52"

I'm almost positive it's a limited slip though, bot tires spin in the soft sand...


Am I looking at the right data?


Rob

[SMKSTAX]

"52" is a non posi diff with 4.10 gears.

[Rob'Z]

Wow, if that's in fact what my truck has then I have a decision to make on the rearend. I was assuming it had 3.73 and wanted to swap out for 3.55. Maybe I just need 3.73's...

The most I can ever see my truck loaded would be a bike in the bed, 80 gallons of veggie in the bed, and my boat on the trailer (about 2800lbs with fuel). What do you think is the best option for highway fuel economy. I'll be running close to a 32" diameter tire.....I've never needed L on my 6-speed and I use 5th (top gear) for any cruising speed over 35-40mph depending on my load.

Is there a chart or site showing the ZF 6-speed ratios so I can plug them into my spreadsheet to help me determine what rearend ratio is best for my needs?



Thanks for the help guys.


Rob

[Rob'Z]

Here's a pic of my tag.

[SMKSTAX]

Your axle code should be under the word axle. Like this:


C1 = 3.73 Limited Slip

[Rob'Z]

Darn...well will these help?