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2007 I purchased new in Dec 2006. 4WD AT. Differential build date is 8/24/2006.

Mileage is just under 104,000. I have always used Amsoil gear lube in the diff's and transfer case and changed the fluid religiously.

Had a whining noise coming from the rear that became progressively louder over time. Turned out to be a pinion bearing. Had pinion and carrier bearings replaced. Ring and pinion gears looked to be in great shape.

I cannot believe how quiet everything is now. It feels like a new truck. The only noise coming from the back is the exhaust noise. How sweet it is.
 

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^^^Wow, So much for using top of the line synthetic Amsoil gear lube and changing it religiously. Do you do a lot of off road hill climbing driving? When you changed your rear gear lube did the old oil come out black like mine did twice? Thanks for posting.
 

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/\/\/\ I thought using good gear lube would lengthen the life of the rear diff. Guess I was proved wrong. Gear oil always came out clean when changing it. Gear lube was changed about every 30K miles and Amsoil was used.

My FJ has never really been off road. I know, shame on me. Only used 4WD in the snow. Never pulled a trailer, nor carried a heavy load. Stock tires and only a 2" front leveling lift.

When checking the rear diff for the whine problem, we put the FJ on a lift and disconnected the rear drive shaft. When turning the pinion by hand, it felt like I was turning a gumball machine. Very scary. Upon tear-down, pinion bearing was shot, gears looked to be in incredibly good shape and changed the carrier bearings for good measure.

I think the rear diff is quieter now than when I drove it off the showroom floor.
 

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VooDoo1, I'm surprised the old oil came out clean every time you changed it with bad bearing wear. I've read that a lot of guys here have noticed their rear gear lube being black with a lot of fuzzies on the magnet like mine which makes me nervous. Glad to hear you got yours fix without having to replace the entire rear diff assembly$$$.
 

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Mine was built on 09/10/2009 and it is a 2010 model with 8,2 rear Diff. However as of last August I have changed it to 4,56.
 
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Toyota 8.2" Replacement Upgrade Click Here
Nitro Rear Axle Housing


Fits:
07-09 Toyota FJ Cruiser
03-09 Toyota 4Runner
03-09 Lexus GX470
02-09 Prado 120


Differential: Toyota 8.2"
Gear Ratio: All Ratios
Manufacturer: Nitro
Warranty: 1 Year

Tech Note:
Requires housing stud, nuts & seal kit NPHTFJC-KIT.
Optional Chromoly axles available AXT60240.


The 2009 & Older FJ Cruisers, 4runners, and Prado 120 utilize the 8” which dates back to 1979, and was originally used in 3000 lb mini trucks with 80 Horsepower and 27” tires. Late model modified Toyotas such as FJ Cruiser run at double the weight, triple the horsepower, and much larger tires to top it off. For this reason there have been lots of failures, enough so that Toyota upgraded the rear to the 8.2” on the 2010 & Newer models. It may seem like a small upgrade but there are significant improvements such as beefier casting, larger bearings, larger pinion diameter, larger ring gear diameter, more tooth contact, and a beefier 12 bolt diff case. This makes for an easy swap for your vehicle and will utilize your existing axle shafts and brakes. This is for an empty axle housing. It will also require a 3rd Member, Housing studs, nuts, axle seals (all of which we offer).

We have also seen a lot of failures on 09 & older FJ cruisers and offer this upgraded rearend package click here
 

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^^^ Thanks for that info and the heads up on "beefier casting" & the "12 bolt diff case". Reminds me of the old 12 bolt rear by GM. If I ever need one I'm going with you guys! :cheers:
 

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Wife's dad has a 2007 with a build date of 6/06 or 7/06. Rear went at 80K a few weeks ago. Took it to Toyota 3300.00 for a complete rear-end and rear brake job. He thought it was his tires... I told him no way and to take it in. Turns out I was right. Price is awful steep for something like that. He could've taken it to my local Offroad shop and had a new one done for 2000.00 +/- lol. Toyota should be helping these people out with a known issue on the 1st builds
 

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2007 I purchased new in Dec 2006. 4WD AT. Differential build date is 8/24/2006.

Mileage is just under 104,000. I have always used Amsoil gear lube in the diff's and transfer case and changed the fluid religiously.

Had a whining noise coming from the rear that became progressively louder over time. Turned out to be a pinion bearing. Had pinion and carrier bearings replaced. Ring and pinion gears looked to be in great shape.

I cannot believe how quiet everything is now. It feels like a new truck. The only noise coming from the back is the exhaust noise. How sweet it is.
I have an early 07 build and have the loud whine coming from the rear end now. Headed to the Stealership as we speak to get it looked at. Really hope its just a pinion or something. Or maybe just needs some new fluid. I'll report back, fingers crossed.
 

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Hi My FJ is 02/06 build with 110k miles. The rear end his humming bad at about 65 mph. It makes a pulsating hum, which I am assuming is the rear end. Can anyone explain what the difference is in damage which requires a whole new 3rd member vs just ring and pinions. I dont have any grinding noise, but it sounds like Im riding on the rumble strip or have huge tires. Any advice is helpful. Also the fluid was changed in it 15k miles ago which didnt seem to make any difference.
 

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Hi My FJ is 02/06 build with 110k miles. The rear end his humming bad at about 65 mph. It makes a pulsating hum, which I am assuming is the rear end. Can anyone explain what the difference is in damage which requires a whole new 3rd member vs just ring and pinions. I dont have any grinding noise, but it sounds like Im riding on the rumble strip or have huge tires. Any advice is helpful. Also the fluid was changed in it 15k miles ago which didnt seem to make any difference.

It is always a good idea when changing out Ring & Pinion you should go with new bearings as well since you have 110K on the clock. Also you want to take care of this as soon as possible before it will grenade on you and leave you stranded. I would suggest calling Chase at ECGS East Coast Gear Supply, no one can beat their service and their warranty. I have dealt with them before and a lot of us on this forum as well.
 

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So its been awhile. What they have all been fixed and now they dont break anymore. LOL Anyways I am now added to the list. Rear end is starting to howl and some grinding. Oil was changed to Syn and it still looks clear. Some sludge on drain plug.
Year 2007 A/T Build date 06/07
Diff build date O7.06.05 (as on tag) so from what I have read that is Jun 05 2007.
Looking for a used newer 8.2
Some light trailer towing and trail use. Not crazy. Cruize Baja trails in the winter.
 

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A list I wish I didn't have to join...

I am the original owner of a 2007, completely stock vehicle with auto transmission and electronic locker. I now have a growling rear diff and left rear wheel bearing noise at 105K, I had the diff oil changed at dealership every 30k. It has less than 20 miles total of very mild off-road use on hard packed sand, bumpy roads, and snow and ice, and zero towing or hauling heavy loads. Most of the miles were highway miles.

Vehicle build date 02/07, diff build date 02/16/07
 

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New member here :)
Great Forum!!!
Approximately what Date did Toyota switch to a New Vendor for these FJ Third Members?
Is there an Approximate Third Member Build Date when these Gear Teeth Stopped Breaking on the Owners of the FJ?
Also.....Who is the Vendor that makes & builds these third members for Toyota?

I have Attached a picture of My 2008 Third Member Build Date. - The Vehicle Build date is 2 days after the Third Member Build Date.
Thank You !!
 

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folks tried to narrow down a build date for the bad ones but I haven't seen an answer to it (from past threads: some folks with failed diffs were marked with what looked like later dates than some others with fine diffs, and also some of the service replacement part's label's dates/numbers were also confusing)

the vendor was not changed, the heat treating process had a flaw and was corrected

The consensus, though, was that the issue was with '06 and some early '07 diffs. By mid/late '07 it was corrected, so your '08 should be fine.

There was one other diff change: the size change made from '10~, from 8.0 to 8.2" ring gear (and, no, they are not interchangeable, because everything was ever so slightly scaled up, including the bolt pattern to the rear axle housing, so the whole rear axle would have to be swapped to adopt it). The consensus is that the 8.0 does fine for most users / most uses, as long as it was not from that early, bad batch.

N
 
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