Rear Differential
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Elder User
Joined: Sep 2012
Posts: 611
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From: Smokey Mountains TN
Rear Differential
How hard is it to change the rear gears? I have 4:10 gears and do not like them.. if anybody has the 3:55 (i guess thats what they are) and want to trade they can feel free and come over and swap them out.. i wont charge anything 
Does anybody know, where to get a different set ?
Does anybody know, where to get a different set ?
Hotshot
Joined: Jan 2012
Posts: 11,132
Likes: 3
From: Southern West Virginia
Don't know of any good write ups, but I have used these shims http://www.ebay.com/itm/FORD-10-25-STERLING-10-5-REAREND-CARRIER-SHIMS-RMS-SUPER-SHIM-KIT-NEW-/330855928015?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item4d088cd0cf
Senior User
Joined: May 2012
Posts: 357
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How much do you tow? Considering its a dually 4.10s are gonna be better for you. I love the 4.10s in my dually mileage isn't affected that significantly to justify me buying or even going through the hassle of a gear swap.....its something of you don't have or know how to work a backlash gauge you shouldn't attempt on your own
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Elder User
Joined: Sep 2012
Posts: 611
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From: Smokey Mountains TN
i do not tow a lot.. the max i ever tow, might be a camper, less than 9000lbs. I just do not like the high RPM on cruising speed. about 2300 at 65
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Cargo Master
Joined: Nov 2010
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I run 3.55s and 35" tires. I don't care for it at all. But they would work good if you run smaller tires like you want to.
Senior User
Joined: May 2012
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Ok I did some searching for you a guy with stock tires ran 2050rpms at 65 with 4.10s and put in 355s and ran 1750 at 65.....so you will drop 300 rpm on stock tires which I would think would be the same 300 rpm drop with any set up if your just changing gears
Logistics Pro
Joined: Oct 2008
Posts: 4,818
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From: Avilla, IN
I researched this a while back when I was considering a gear change, and you will spend more on the proper tools to do the job right than you will on parts. Also it sounded very difficult to do, like somewhere between rebuilding an engine and rebuilding an automatic transmission. I decided it wasn't worth attempting it myself. I figured I could do it, but it just wasn't going to be cheap or very quick by time I figured out how to do it.
Its more expensive, but have you looked into an auxillary transmission? Race, performance & street cars, engines, engine parts, trailers for saleI suggest that because towing even 9000 lbs. isn't very fun with 3.55 gears.
Its more expensive, but have you looked into an auxillary transmission? Race, performance & street cars, engines, engine parts, trailers for saleI suggest that because towing even 9000 lbs. isn't very fun with 3.55 gears.