Hello all, I am still new to the forum and recently started to expierence an issue with my 07 FJ Cruiser stock automatic 4x4 with 229K miles. I started to have a droning noise in the rear as I accelerate. I had the stealership check it out because I have checked all I could think it could be and could not pin point the issue. I was informed it is my rear ring and pinon that is starting to give me problems. I was looking at a local diff shop to do the work. So I was looking at my options and my stock setup is, I have 3.73's in the front and rear. The local diff shop is very reputable and great reviews. They are willing to install the stock 3.73's or the upgrade 4.11's (parts from toyota) but nothing higher because those setups are cheaply made and would honor a 1 year warranty with the 3.73 or 4.11's (the same as toyota dealership). My question is what is the biggest tire I can mount with a 4.11 gear ratio with no issues?
Osky1976
How big are you wanting to go? 33s are about the best size for the FJ, and the stick 3.73s gear ratio can handle those with no issues. If you feel adventurous and want to do some more work to fit them, 35s are doable. With 4.11s, you’d be sittin pretty all day. If the price is the same at the shop and you plan on continuing to mod the rig, might as well go higher gears.
Before you look into parts, look at East Coast Gear Supply. When my rear ring and pinion went out, I got a complete third member at the stock 3.73 ratio for $800 and did the install myself. To regear both the front and rear would’ve been a lot more money.
Before you look into parts, look at East Coast Gear Supply. When my rear ring and pinion went out, I got a complete third member at the stock 3.73 ratio for $800 and did the install myself. To regear both the front and rear would’ve been a lot more money.
ECGS honors a 5 year warranty on everything. Just saying. 
I would price them out at least.
It depends on alot of factors, including how light your wheels and tires are and how much lift and bumper weight you have. An almost stock FJ with lightweight 35" tires actually still handles very good on the stock gear ratio.
Add some bumper weight, heavier than average 35" tires and a full lift, most people go to 4.56. So 4.10 wouldn't be too bad up to a 35" tire.
I would price them out at least.It depends on alot of factors, including how light your wheels and tires are and how much lift and bumper weight you have. An almost stock FJ with lightweight 35" tires actually still handles very good on the stock gear ratio.
Add some bumper weight, heavier than average 35" tires and a full lift, most people go to 4.56. So 4.10 wouldn't be too bad up to a 35" tire.
I second the 4.56 gears for what you’re wanting! Trust Iconic — he knows his s*** in this department!
Even if you don't have the ability to do it yourself buy them to ECG and have a mechanic put them in with new axle seals.
Seals are cheap, I did all of mine while I had it apart. Like a clutch kit, if I can put hands on it change it.
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