high pinions in front and rear

[toyota35bogger]

i was just wandering can i use the fj80 high pinions front and rear??    

[FIREBALL]

Yes you can use them front and rear, BUT running one in the rear is not advisable. Because the hp is a reverse cut gear, it is running off the face of the gear when installed in front. When using it in the rear it is running off the coast side and is much weaker. They also don't oil properly because they are running backwards. Marlin had a couple fail in his truck when he tryed it.

[Willy Mammoth]

I am using one in the rear and this has me scared. The first time it goes I plan to change it back to a low pinion. I only hope it holds out till I can get a shorter trans. Is it possible that someone can cut a proper gear set for the rear? I am sure there are a lot of people that will buy them me included. Another thing, Someone could devise an oil pump to fix the oiling problem.

Just my 

[FIREBALL]

On a trail only rig it might work ok. You are usually not moving fast enough to generate much heat, and you may have enough sloshing to keep everything lubed well enough. Part of the prob Marlin had was he drove his truck everywhere he wheeled. 5hrs or so to the hammers about the same to the con, etc. If it's street drivin it's probably not going to work. A trail only rig, might work.
As far as the gears go, ya it would be nice if someone made them both ways, but the cost of re-tooling is pretty steep, and it's still a fairly limited market in the long run.
By the way.....how far do you have drag your foot to stop that thing. Looks a little light in the brake department.

[Willy Mammoth]

By the way.....how far do you have drag your foot to stop that thing. Looks a little light in the brake department.

  Here is a picture showing the calipers that arn't installed yet  

[Hyena]

I think Dean at Marlin crawler is using High Pinions front and rear.  They made a way to oil the rear.  You could talk to him or maybe get BigMike, i think he knows about it.

[toyota35bogger]

ok so the rear don't do!
but the front can you just put a standered v6 member in itand will the angle be ok??
i am useing it as an everyday driver but every weekend wheel the piss out of it

[Marketing]

You can't run the high pinion in the rear. Everyone one that trys breaks the ring and pinion sooner or later.

Run a V6 in the rear and tip it up.

[dirtyskivies]

i wouldnt even run one in the front. worst scenario my front ever experiences is me backing up something in 4wd when the gears are turning the appropriate direction and its doing more work than the rear third.  vice versa, when youre climbing things going forward the rear is doing the majority of the work...

[Willy Mammoth]

Good observation, but unless you are always climbing backwards I think a gear cut to go in front would be strong enough up front. Finess is a good thing when it comes to long gear life. I have run over plenty low pinions in the rear.

[Marketing]

In the front, no other 8" toyota diff is as strong as the high pinion diff.

[FIREBALL]

I've got the hi pinion up front, and it works great. 38's and I have no worries about the front diff.

[dirtyskivies]

In the front, no other 8" toyota diff is as strong as the high pinion diff.

i call BS.  maybe if your talking about driving forward down a dirt road in 4wd.  but certainly not ideal in the world of rockcrawling. specifically backing up something or backing up when in big rocks and the front axle has to do the work the rear normally shared the majoity of.

its the exact reason(s) youre describing when you say dont use a high pinion in the rear...

[FIREBALL]

Call BS all you want, I don't know about you, but I spend much more time going forward than going back, and when your workin a hard trail climbing that front diff is much stronger running on the face of those gears. The other reason they had probs with them in the rear is the oiling issues.

[Marketing]

I usually spend most of my time driving forward, If you spend a lot of time backing up, maybe a V6 in the front is a better choice for you.