Gear Install Questions
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Freshman User
Joined: Mar 2005
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Gear Install Questions
I have a 05' F-350 6.0L 4x4. I need to change the gears in the rear and front axles. It has 3.73 L/S now, but I am wanting to switch to 4.30's and an ARB air locker for the rear. I lost a lot of torque when I put the 37" tires under it and I want it back. I am proud of doing my own work and I want to do this gear swap myself. I am mechanically inclined and I am capable of doing this work if I can get the adequate information ahead of time. I was wondering if anyone here had any tips on how to do this and/or where I might be able to find more information on it. I have access to most of the tools I will need and am whiling to purchase any others necessary. If someone could get back to me on this, I would appreciate it greatly.
New User
Joined: Oct 2005
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This is a big job to do right and you will need some special tools such as a dial indicater and mag base holder a spare set of carrier bearings honed out to make seting up the backlash easier not that it cant be done in the drive way but it is a lot of measuring and adjusting so good luck and as for a place to get your gear sets i have had good luck with randys ring and pinion you can do a search on the net for his address and they will answer all your questions great people to do business with. When i did my gear change in my jeep i found it easier to remove the axles and set them on saw horses more romm to work that way.
Elder User
Joined: Dec 2003
Posts: 652
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I swapped out gears in my last truck (1992 f350), not A hart job just time consuming. Only special tools I used, dial indicator and A good gear puller, to remove old bearings. And I machined A set of alluminum bearing drivers.
Posting Guru
Joined: Oct 2003
Posts: 1,332
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From: Baltimore
If you want to do it right, you need a bearing puller, press, pinion gauge, inch pound torque wrench, foot pound torque wrench, dial indicator, micrometer, an assortment of hand tools and a selection of shims. There are special tools for removing the pinion flange and another for installing the bearing cups. You might want to go get a shop manual to see what the job involves. Your going to need one anyway if you do the job yourself.
Post Fiend
Joined: Jul 2005
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From: 21791
Originally Posted by 4mil
I believe 4.30's are factory. When I purchased mine for the install, Randy's said it was.
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Postmaster
Joined: Oct 2005
Posts: 3,620
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From: WARRINGTON, PA
if you put 37's on it, you might want to go to a 4.56. i have a ram 2500 as well as my excursion, i put 5.13 in that, but it's also a 5 speed. from my expierience, i would use the 4.56's. although your truck will be back in it's right range for torque and power, your fuel economy will suffer a little more that it has with just your tire change.
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Freshman User
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Thank you guys for the help. I am planning on doing this swap over the winter. I still have not decided for certain whether I am going to run 4.56's or 4.30's. That is something I have been trying to get feedback from other people who have ran them. I figure, the 4.56's would be equivalent to a stock truck with 4.10's and the 4.30's would bring my truck close to its original gearing. Has anyone driven one of the stock 6.0's with 4.10's and a 6-speed tranny? I am trying for a good combo of 1/4-mile times and still strong pull-ability. I am worried that the 4.56's will make the shifts to fast to keep up with.
Oh, as for the 4.30’s coming stock, the last two that I have ordered, the options were as follows:
4.30’s – were only available in the gas engine ¾-1 ton w/ auto tranny
4.10’s - in diesels, were available only in the dually’s or SRW w/ auto tranny
3.73’s – in diesels, were the only option in the 6-speed SRW
Oh, as for the 4.30’s coming stock, the last two that I have ordered, the options were as follows:
4.30’s – were only available in the gas engine ¾-1 ton w/ auto tranny
4.10’s - in diesels, were available only in the dually’s or SRW w/ auto tranny
3.73’s – in diesels, were the only option in the 6-speed SRW
Senior User
Joined: Aug 2003
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From: maryland
i am running 35s with 3.73s and it seems like they are 3.30s so you will seem even higher running 37s i am going with 37s and 456s in over the winter i think you would do good to do the same. here is a link that might show you a little better.
https://www.ford-trucks.com/forums/s...ight=BFR+250SD
https://www.ford-trucks.com/forums/s...ight=BFR+250SD