What ratio?

[jec1521]

Hey guys, Quick question for you.

I have an 06 roush Stage 1 F-150, and I ordered the truck with 3.73 gears, which it says on my Ford MSRP sticker sheet. But under the hood of the truck, it has a label that says something like "Roush Modifications" One of the modifications says "Speedo recal" but under that and to the side it says "3.55 ratio" Does this mean I have 3.55 gears instead of the 3.73?

[Roush06FX4]

Check your drivers side door sticker,under the axle heading the code is listed.
B6 is 3.73 LS gear ratio and H9 is 3.55 LS gear ratio.My Roush has a 3.73 rear but the pcm was calibrated for a 3.55 rear,which I felt immediately when my truck was short shifting,1-2 shift under 5000 rpm.I had roush reflash my pcm and it shifts much better.