Anyone know if there are OEM 3.73 to 4.10 ring and pinion swaps available for 2007 F150's in the 9.75" rear? I've checked Ford Direct Online and they do not show a 4.10 option in the 9.75 rear.

I've found several aftermarket brands but wanted to go OEM if possible.

Search function does not turn up much.

If no OEM what are the better selections? What's the best way to do this?

 

There should be ,4.10s are avalable with the payload option in the xl work truck.

 

10.25 axle in the Heavy Duty (7 lug axle)...can't get in the normal F-150 though


Ford Racing sells the 4.10 for the 9.75 axle. Part #M-4209-J410

Ford Racing Performance Parts [M-4209-G410*]

(towards the bottom of the list)

 

Checked FordRacing.com, they do not list a front 4.10 option only a rear.

Unless they are the same I'm out of luck, since I'll have to do front & rear on 4WD.

It looks more and more like aftermarket which concerns me since gear whine might be an issue.

I want to perform the following modifications to the truck....

Level
Lift
Firestone bags/Supersprings/
3.73 to 4.10 swap
285/65/18 tires, E rated.

I assume I'll need to add 3" lift to accommodate the tires and that really is all I want to go up.

Anyone know the conflicts between the lift and bags/springs?

If I can't change into 4.10's then maybe a programmer.

Give me thoughts.

 

Just buy a good set of gears (Yukon and Precision Gear are two I've had good results from), set it up well, break it in properly and you can be 99 percent certain of no problems. I've installed many aftermarket gearsets, or watched them being installed, with only a few problems. Even from some brands that are reputed to be noisy. Oddly enough, I, personally, have had more trouble with "factory" gears (from GM, Land Rover and Mopar, not from Ford, though) so my bias is a little more the other way. Ford can make noisy gears too. Anyone can. The advantage of many factory gears is that they are often double-lapped to make sure they are quiet.

Also in my experience, a fair number of so-called "noisy gears" turn out to be that way from improper setup. It's easy for a tech to to blame the gears when he screws up if you aren't there to see the pattern (assuming he even bothered to check and you knew what to look for). I once watched a self proclaimed "professional" who set up gears "by eye and feel." He was the only game in town around there and too arrogant and hard headed to listen to anyone. Anyone around there with quiet gears were just plain lucky. If you reuse all the old shim dimensions for the new gears, you have a better than even chance everything will come out OK but, man, talk about rollin' the dice!!!

I do not think Ford Racing gears are from Ford (meaning Ford's in-house axle plant, Visteon, Sterling or whatever they call themselves now). They are reputed to be either Richmond or Precision Gear. That info is a few years old, though, even assuming it's correct. They could now have a different supplier.

 

I don't know about going from 3.73 to 4.10 but sometimes when you change gear ratios you also have to change the differential case. There is a cut off point with ring and pinions fitting certain cases. No big deal just addtional cost to consider.

 

No carrier breaks on Ford axles, as with Dana axles and a few others. They just offer thicker or thinner ring gears to change the offset.

 

From what I hear, Precision Gear is no longer in business. Another company purchased them but I think it is only for the name. You can go with either Yukon or Motive Gear, just dont go for the cheapest sets. You really do get what you pay for with gears. Spending the extra $40 or so will get you a nicer finished gear. The cheaper the gear, the worse the finished product is.

 

Jim,

You're running 275/17's with your truck. How's the performance with 4.10 rear and pulling?

 

Here's a quick question:

Assume I'm running 275/285/65/18's on the truck, which of the following two options would perform better theoretically???:

Stock 3.73:1 rear and Edge Programmer

OR

4.10:1 setup without the Edge Programmer

Yeah, yeah, yeah, I know there's a third option of both but let's not go there just yet.

Me....

 

Yeeehaaa! A bit under 8 seconds 0-60. Pulls well. Most of my pulling is extremely heavy loads for short distances. In that venue, it does almost as well as my old F-250 diesel.