high pinion toyota portals

[cavsfj40]

Me and my buddy were shooting the sh!t over some beers and this came up. Could the third be mounted upside down and portal boxes be installed at the axle ends? custom 2 gear boxes would reverse the rotation from the flipped 3rd member and get you going the right way again. The flipped 3rd would also serve to get the driveline angles even better. i jjust want to hear what you all think

 

[Poser]

Get it done!!

Good luck!

-Steve

 

[Radd Cruisers]

Do you think flipping the third is really worth the effort once you have the portal clearance?

Rob

 

[hammerhead]

For a crawler it would work but on the road the pinion wouldn't be getting the lubrication as designed so I don't think it would live long. Cool idea though.

 

[Radd Cruisers]

Since the gearing is out on the ends and you do not require the third pinion strength, hows about using the high pinion off the front of the 80 series?

Rob

 

[Mace]

Guys, the reason for flipping the third is so that the truck has 4 forward gears not 4 reverse gears...

Honestly it sounds like a good idea but with all of the work going into 9" rearends why not just use one of those?


If you used a high pinion 80 series diff you would still want to flip it.

 

[Medusa]

And you would still need to design and build a mechanism to lubricate the pinion bearing.

 

[Mace]

[quote author=Medusa link=board=12;threadid=11096;start=msg100356#msg100356 date=1076085456]
And you would still need to design and build a mechanism to lubricate the pinion bearing.
[/quote]

Woud you need to if you made the hi pinion to a low pinion?


???

 

[hammerhead]

The lubrication troughs would be going the wrong way any time you flip a diff upside down. Jon Bundrant uses 9" Fords flipped and gets away with it because he is only cawling. He told me he overfills them for extra protection.

 

[cavsfj40]

I figure that a 1/2 tube from down in the depths of the diff case up to the pinion area would do the trick if the tube were located closely enough to the pinion and close enough to the ring to get some flow pressure. Mind you, I don't mean right against the ring, but close enough for the oil to swirl around it. The high pinion toy third would work with a three gear portal box but the gears would have to be smaller to avoid a ridiculously sized portal box. tossed the idea around today a bit more and got to thinking about the finer points of the stub shaft for the portal. Any suggestions? How about at the front with all the steering componentry? I just dont like the look of avalanche's d60 portal boxes. They hang so low.

 

[Mace]

[quote author=hammerhead link=board=12;threadid=11096;start=msg100465#msg100465 date=1076099411]
The lubrication troughs would be going the wrong way any time you flip a diff upside down. Jon Bundrant uses 9" Fords flipped and gets away with it because he is only cawling. He told me he overfills them for extra protection.
[/quote]

Lots has been done for flipped 9" oiling issues.
Bondurass bought the flipped 9's I kinda doubt that he knows exactly what went into them..

Heck, Nolen is planning on driving his 40 with 9"/mog portals down the freeway

 

[dylan]

also, ring and pinion gears aren't as strong in reverse, so you'd need to make backwards gears for full strength. thats what they did for the 9"

 

[cavsfj40]

the thing of it is, the gear faces that would be striking would be the same because the rotation would be in the same direction. it would be as if the entire axle was flipped over. the gears would still be rotating the same way is what i am saying. think about it. the housing rotates on the axis of the pinion. nothing else changes. new gear would have to be cut to get a high pinion w/o the portal ends to rotate the right way.

 

[cavsfj40]

let me rephrase. if the pinion was spinning ccw then it would still be spinning ccw and the ring would be on the other side eand still turning the same direction. the reversal in direction occurs because teh housing is rolled over

 

[Eskimo]

[quote author=Mace link=board=12;threadid=11096;start=msg100533#msg100533 date=1076105927]
Heck, Nolen is planning on driving his 40 with 9"/mog portals down the freeway
[/quote]

Sunray is also making a geared oiler for it...

I talked with a guy who did this kinda thing with a 9", and he just overfilled the axle by quite a bit... He's gonna drive it for a few months, and take the third out and report back on it...

 

[Mace]

[quote author=Eskimo link=board=12;threadid=11096;start=msg101459#msg101459 date=1076266608]
Sunray is also making a geared oiler for it...

I talked with a guy who did this kinda thing with a 9", and he just overfilled the axle by quite a bit... He's gonna drive it for a few months, and take the third out and report back on it...
[/quote]

Exactly,
9" axles are cheap and plentiful.
Why go to this extent to make a portal and not make it as strong as possible and as easy as possible....

 

[HZJ60 Guy]

Either way you go, you'll be BENDING axle tubes. That's what has been happening with BOTH toy axles and custom 9" axles that have had mog portals installed on them.


TB

 

[bad_religion_au]

could you go with lighter portal boxes (volvo's or something) to stop the bend, or brace the axle tubes