09f150guy

I have a 09 5.4L with 3.15's currently in the truck. If I wanted to jump to 3.55 or even 3.73's what all would i need to purchase? I know I would need a new ring and pinion set...but is there anything else?

Fordrocks39

Are you going to do it or are you getting a shop to?!!

09f150guy

Shop, I didn't even consider it a DIY, being that if something isn't just right, will cause me aggervation later on down the road. But I would like to get the parts online to save some money...baller on a tight buget

gixx1k2

All you need is the ring and pinion set(front & rear if 4x4) and possibly a installation kit that comes with the shims, bearings and what not. Depending on the condition of the bearings you may be able to re-use them. Also if you want your speedo to read the correct mph you will need a programmer like the sct x3. I just changed my gears my speedo was off by 10 mph at 60

09f150guy

Yeah I figured I would need the ECU reflashed because of the gear change. I am torn on what size to go with though. I pull a 5-6k boat a good bit, and I'm tired of my transmission changing between 5-6 on flat roads. Even with normal driving (to work and around town) it is always switching gears going up slight inclines. Understandable I did put a slightly bigger tire than what came from Ford, but even before that change, it was still bad.

KingRanch4Life

iTrader: (2)

Does that SCT X3 correct the speedo for tire size change as well? I want my speedo to read correctly but I purchased a Edge CS.... Thinking I need to get X3..

gixx1k2

yes it will I have 35 inch tires with 4.56 gears and my speedo is dead on.

gixx1k2

yeah the gear you hav is terrible for towing specially with bigger tires, I would recommend you go with the 3.73 for sure.

gixx1k2

I forgot to mention I have a set of 3.55 gears front and rear off my truck with 15k miles for sale.

BobbyVA

I'm looking into this as well...found some 373 ford racing gears on summit for $130 so $260 total for a set..not bad but how much will labor cost? And how many hours should it take so if the shop says 6 but only takes 4 we can call BS