Just out of curiosity, what’s the biggest tire size you’ve ever seen on a 70 Series?
Tire sizes
- Thread starter Indyteecee
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Are those drivetrains that strong? Obviously we never got the 70 Series here in the US, and non of the Tacoma’s or 4Runners here would ever be able to run anything above 37s without constantly breaking things.
42x14.5" on this KZJ78. Of course, it's running portal axles, not the original Toyota ones.
The axles in most 70 series are basically the same axles you would find in an FZJ80. Obviously the front is going to be way different than the IFS of the Tacoma/4Runner. The rear is a 9 1/4 ring gear which is much stronger than the 8.4" in the Taco or the 8" in the 4Runner (or factory locked Taco). While I think all FZJ80s in the US had full floating rear ends, not all 70s did but it seems like most did. As far as I know (and it seems that I learn something new about 70 series Toyotas daily) all the factory locked 70 series trucks came with the full floating rear ends. I know mine has lockers and full floating rear and every locked truck I looked at had the full floating rear. There are plenty of full floaters without lockers as well.
One thing that helps 70 series axles live a long healthy life under a lot of our rigs is that the vast majority of the 70 series trucks are severely under powered so you don't get near the amount of skinny pedal damage as you would in a truck without hamsters under the hood. That being said, it also means that not a lot of us run anything over 33" tires because asking the engine to turn more than that is almost cruel, especially those of us that have 1PZs.
i run 35's with a turbo intercooled 1hz. have ARB air lockers front and rear. the previous owner seemed to be able to break the front axle shafts with relative ease with the locker engaged. with no locker, it's fine. the rear though has held up fine. both full floaters obviously. hth.