Factory Locked Rear Differential- problems&solutions

[GXO]

If you are being friendly with the skinny pedal, things break.

Also of note is that most of the trail team uses ATRAC with no locker almost all the time.

 

[Tapage]

Tapage, I think the Prados use the same RD23 ARB rear. Front air locker is being introduced by ARB asap, 2 versions for 2 diff. gearing.

I'm pretty sure that the rear diff of all preados is 8" like a pic up .. but it's really the same .. ?

I'm not sure coz I thought it don't come from Jap .. as same as rear diff of some Hi Lux 2006 and Fortuner ..

 

[FirstToy]

Guys,
The TTTeam broke a FJC rr diff going up Cadillac Hill at Rubicon w/ TTORA, along w/ the yellow FJC earlier in the trail.

Skinny pedal misuse does not *seem* to be an issue (see links w/ ttora & prado owners comments)
tapage, same 8" rr diff. All use the RD23 rr arb locker.

Looks like the first 4Runner rear diff breakage today!
http://www.toyota120.com/forum/showthread.php?p=8053
Asked him to keep us updated and add photos.

 

[Cruiserdrew]

And BOTH of the Trail Team FJCs at Rubithon had previously broken their rear diffs and had them replaced.

I think you have too much weight and too much torque and too small a diff. This could be easily remedied with an 80 series axle right off the shelf at Toyota Inc, and you'd get a FF as a bonus. The Coaster busses you see in central America carry about 25 passengers and all run a centered 80 series axle, so I'm sure it's up for the job under an FJC.

 

[CandyPants]

OK, I take it back about the TT, seems that I didn't have all the information!

 

[Quixote]

This could be easily remedied with an 80 series axle right off the shelf at Toyota Inc, and you'd get a FF as a bonus.

Interesting. Has any 120 series based owner tried this? How hard would the mod be, results?

 

[Tapage]

The Coaster busses you see in central America carry about 25 passengers and all run a centered 80 series axle, so I'm sure it's up for the job under an FJC.

Drew .. I'm not totaly sure about this ..

http://www.toyota.com.pa/showroom/coaster/index.html

Coaster are duallie in the rear axle ..

They come with rear drums and spring packs ..

 

[Cruiserdrew]

Drew .. I'm not totaly sure about this ..

http://www.toyota.com.pa/showroom/coaster/index.html

Coaster are duallie in the rear axle ..

They come with rear drums and spring packs ..

Get a good close look at the axle. It's the same diff, and same diameter axle shafts. It's obviously wider, but my point was that this is a strong axle that Mr. Toy already has on the shelf. A centered version like the coaster, but without the dualies would be perfect in an FJC.

I spent 15 minutes under a Coaster in Belize-the driver thought I was nuts-but it's the same mechanicals as we got on the US 80 series. I thought it was pretty cool. No locker though...

 

[Tapage]

I thought it was pretty cool. No locker though...

Anycase .. if you are right and is the same 3rd member as 80 series FF rear axle .. I thought is posible fit a 80 series locker ..

 

[bulldog-yota]

Maybe before we run away with replacing axles, we should probably understand the real problem behind this and also a good solution.

So far it seem that an ARB locker in the back and solid spacer is the way to go. These seem to hold up just fine on the Prados, which weigh more than either the FJC, Taco or 4R. Not unlike the issues with the front diff of the 100. It's a lot easier to slap in an airlocker than swapping out the alxe and loosing all the electronic dodads for safety and traction.

The ideal would be for Toyota to fix the original issue, which seems to be an installtion problem most probably.

 

[Runner Ryan]

I wheel mine pretty hard, and I haven't broken mine....yet.
One thing I have noticed is there seems to be a lot of play in the backlash. Not that noticable on the trail, but in cruising the highway. On and off the gas creates quite the lurch meaning play between the pinion, and ring gears.

 

[Michael1]

I've noticed a lot of backlash, too. I wasn't sure if it was the transmission, transfer case, rear axle, or all three put together. It's a bit annoying at times.

Michael

 

[Full_M3tal]

Interestingly, blown diffs are "common" in the minitruck crowd too...

I Actualy Ask One Of The Team Fj Guys Over Cruise Moab 2006 On Hells Revenge...


I Asked Him What Axle Is The Because It Looks Very Famil...

He Said Its The Same Type Of Axle Used In The Mini's And Tocoma.

Just My .02


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Any One Seen A FJ With Exo?