simple ? guys. i have a 2003 boss f150 and am wanting to know what gears i have are they 3:08 or what...thanks

 

what dose the tag on the Axel say? or if it dose not have one jack the rear and count the revaluations. that is the only way you are going to know.

I would sure like to see your rig it sounds sweet.

 

ive got a few pis of it up im my gallery...thanks

 

HI!... You most likely have 3.55 gear ratio. That is the most common gear ratio in the F-150's. But with yours being a limited edition BOSS. You might have got 3.73 gear ratio. Like stated before, check the tag on the rearend diff cover. There will be two. One will be the reaend identification tag. The other is just a tag telling you to use synthetic oil in the diff. If you are missing the identification tag or can't read it, simply jack the rear of the truck with jack stands. Take some chalk and draw a line on the driveshaft. Then draw a line on the sidewall of one of your rear tires. Sin the rear tire 360 degrees and count how many times the drive shaft turns.

- 3 turns = 3.08
- 3.25 turns = 3.27
- 3.50 turns = 3.55
- 3.75 turns = 3.73
- 4 turns = 4.10

And so on.

 

What happend dyno day?

 

thanks for the info neal. my tag is definitely not readable, so ill try the marking thing.. sounds pretty easy

 

Can you read your door tag? Whats the axle code there?

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