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Discussion Starter #1
I was just working some portal axle thoughts through my head. Most portal axles have to have the axle shaft spin backwards from normal. So the question is can you install standard cut gears in a high pinion housing and reverse cut gears in a standard housing?

thanks

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No, you cannot swap gears like that. the housings are completly different.
What you could do though, if you are going to use reversing portal ends. you could take a standard housing and just turn it over and then mount the ends on it and your driveshaft will turn the right direction. Your only problem then would be modifing the oiling passages so that the pinion bearing would get plenty of oil.
 

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If U used a 9" Ford diff then it will still oil properly when upside down.
 

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Standard cut gears and reverse cut gears both rotate in the same direction. The cut just changes which side of the gear that power is applied to in a front application. A 9" will burn out just like any other diff if you flip it. I've seen a few of them burn up the pinion when tilted too high to point at a CV joint. The 9" high pinions that you see on the market have specially designed oil passages to lube the pinion.
 

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Discussion Starter #5
Thanks, I wasn't sure.....

What if you flipped a high pinion diff? That should be oiling alright correct?

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Originally posted by Mieser:
<STRONG>Thanks, I wasn't sure.....

What if you flipped a high pinion diff? That should be oiling alright correct?

later <IMG SRC="smilies/jeep1.gif" border="0"></STRONG>
Your oiling passages would be upside down... just like if you'd flipped a standard rotation housing.
 

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Flipping a hi-pinion diff would basically turn it into a low-pinion diff. Maybe if you put lots of oil in it (low-pinion diff cover would give you a high fill point) then the pinion bearings would be totally immersed in oil and there wouldn't be a problem? Or would they still be oil-starved when everything is spinning at highway speeds?

What do you guys think?

Chris
 

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Discussion Starter #8
Yes, the oiling passages would be upsidedown, thought you would think the the ring gear would sling enough oil into the pinion. Plus if it was filled up to where it should be the pinion should be almost covered in oil anyways?

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