Difference between High Pinion and Low Pinion? - JeepForum.com
 
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post #1 of 10 Old 04-09-2008, 03:25 PM Thread Starter
Brads_nky_yj
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Difference between High Pinion and Low Pinion?

I am just wondering whats the difference between high pinion and low pinion differentials? I thought I knew but I was just reading a thread and obviously I dont know. I know the High pinion is in reverse rotation, but what exactly are the differences? Thanks


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post #2 of 10 Old 04-09-2008, 03:46 PM
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not reverse rotation, reverse cut.

The HP gears have the load being put on the "drive" side of the gears when going forward, this is significantly stronger than the coast side.

vice versa, going in reverse makes the hp 30 weaker than the lp

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post #3 of 10 Old 04-09-2008, 04:46 PM
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High pinion = Just that, the pinion leaves the diff towards the top end of the diff

Low Pinion = Just that, the pinion leaves the diff towards the bottom end of the diff.

Excuse the crude drawing but you get the idea:


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post #4 of 10 Old 04-09-2008, 04:56 PM Thread Starter
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So how do you change it to a high pinion? Just rotate the diff?

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post #5 of 10 Old 04-09-2008, 05:04 PM
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Like MLJeeper said.
Taken from therangerstation.com.
"The low pinion axle is an indication of a standard cut ring gear and the high pinion axle is an indication of a reverse cut ring gear. Often mistakenly referred to as 'reverse rotation', the term 'reverse cut' is perhaps the single most misunderstood term used by off-roaders and even many in the axle business. A reverse cut housing is not just like a standard cut housing turned upside down. It is a specially designed housing for front driving axles. Contrary to popular belief, it does not turn backwards or in reverse. The term 'reverse cut' actually refers to the direction of the spiral cut in the ring gear.In a reverse cut axle, the spiral on the ring gear is opposite from a standard cut ring gear. The idea behind reverse cut is to strengthen the operation of the gear when it is used for a front axle application.The bottom line is that reverse cut gears (front axle style) and axle assemblies are inherently stronger for front axle use because of the way the gear mesh when moving the vehicle forward direction. They also provide better driveline angles because the pinion is located above the centerline of the axle."



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Originally Posted by Brads_nky_yj View Post
So how do you change it to a high pinion? Just rotate the diff?
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post #6 of 10 Old 04-09-2008, 05:16 PM
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Quote:
Originally Posted by Brads_nky_yj View Post
So how do you change it to a high pinion? Just rotate the diff?
no the axle will want to drive backwards and you cant put LP gears in a HP housing to try to correct direction/rotation, jason.

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post #7 of 10 Old 04-09-2008, 05:30 PM Thread Starter
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Ok great info thanks guys, next question.. Where can I get a hp 30 then?

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post #8 of 10 Old 04-09-2008, 05:44 PM
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Probably the same place as a hp60 if you're lucky. If you're going to spend money, move up at least to a d44.
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post #9 of 10 Old 04-09-2008, 06:06 PM
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Quote:
Originally Posted by Brads_nky_yj View Post
Ok great info thanks guys, next question.. Where can I get a hp 30 then?
If you have a stock YJ, it already has a HPD30 for the front axle stock from the factory.

Or, you can find them in any YJ front axle unless somebody swapped it out.
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post #10 of 10 Old 04-09-2008, 06:26 PM
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You can also find them under an XJ, but you will need to cut/ weld on some new spring perches.

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