How to ID a LP vs HP gearset

[diesel298]

how does one Identify a gerrset as High pinion Vs low pinion
when the gears are just sitting in a box?

[JeepXJ3]

I didnt know that mattered, I always thought that was all in the design of the housing itself and didnt have much to do with the gears themselves...

Good question.

[diesel298]

I didnt know that mattered, I always thought that was all in the design of the housing itself and didnt have much to do with the gears themselves...

Good question.
yeah so did i
i have recentley learned otherwise

then i looked in a few catalogs and the companys part# are different also

[4Lo]

Yea I think HP = reverse cut ? This doesn't help you id it though...

[JeepXJ3]

Yea I think HP = reverse cut ? This doesn't help you id it though...

Now I always thought that had to do with weather or not that was a front or rear diff... Wow, I have much to learn here... :dunno:

[Vetteboy]

Wow... :lol:

Yeah, high-pinion and low-pinion gearsets are totally different and are specially designed for their respective housings.

Technically the 'cut' is the same for both, because the same direction of rotation on the pinion results in the same direction of the ring gear for both sets. High-pinion sets are known as 'reverse spiral' due to the direction of the helical bevel used.

If you were to simply take a diff and flip it upside down (like, make a 'low pinion' housing 'high pinion') it would spin the wrong way, because it's a standard spiral gear set with the ring gear on the opposite side.

If you have the gears, there are a few ways to tell which is which by the direction of the helix etc, but the easiest way is this:

1) Put the ring gear flat on the floor, teeth facing up.

O

2) Mesh the pinion gear with it so that the 'yoke' end is pointing to the right. If it goes together like this:

O_

then it's low pinion. If it's more like

O¯

then it's high pinion.

Dig?

[JeepXJ3]

I dig :pimp: Now im still a bit fuzzy on reverse cut...:confused:

[Timmay]

Wow... :lol:

Yeah, high-pinion and low-pinion gearsets are totally different and are specially designed for their respective housings.

Technically the 'cut' is the same for both, because the same direction of rotation on the pinion results in the same direction of the ring gear for both sets. High-pinion sets are known as 'reverse spiral' due to the direction of the helical bevel used.

If you were to simply take a diff and flip it upside down (like, make a 'low pinion' housing 'high pinion') it would spin the wrong way, because it's a standard spiral gear set with the ring gear on the opposite side.

If you have the gears, there are a few ways to tell which is which by the direction of the helix etc, but the easiest way is this:

1) Put the ring gear flat on the floor, teeth facing up.

O

2) Mesh the pinion gear with it so that the 'yoke' end is pointing to the right. If it goes together like this:

O_

then it's low pinion. If it's more like

O¯

then it's high pinion.

Dig?

Werd. Couldnt have explained it better myself. :pimp:

Do you even do any work when you are on the clock? :lol:

[diesel298]

Wow... :lol:

Yeah, high-pinion and low-pinion gearsets are totally different and are specially designed for their respective housings.

Technically the 'cut' is the same for both, because the same direction of rotation on the pinion results in the same direction of the ring gear for both sets. High-pinion sets are known as 'reverse spiral' due to the direction of the helical bevel used.

If you were to simply take a diff and flip it upside down (like, make a 'low pinion' housing 'high pinion') it would spin the wrong way, because it's a standard spiral gear set with the ring gear on the opposite side.

If you have the gears, there are a few ways to tell which is which by the direction of the helix etc, but the easiest way is this:

1) Put the ring gear flat on the floor, teeth facing up.

O

2) Mesh the pinion gear with it so that the 'yoke' end is pointing to the right. If it goes together like this:

O_

then it's low pinion. If it's more like

O¯

then it's high pinion.

Dig?
i know all about the cut/ roation...stuff
and i get what ya sayin bout the how to

but whats sayin your not lookin at it backwards?

[diesel298]

nevermind

[diesel298]

ok so i have a set of HP d30 gears

[Vetteboy]

Got everything under control there, Ray? :lol:

Do you even do any work when you are on the clock? :lol:

Sure, but I always have :jeepin: and :pirate: and :naxja: and :rc4x4: and :gmail: going in the background. Firefox tabbed browsing FTW. They all go away with a quick press of ALT-tab. :)

Today was actually pretty slow, but I got some pretty large projects completed real early today (much faster than I was expecting). Nothing like spec'ing out a steel mill transport table system for Siemens worth at least $586,000 at 8:30 AM when you can barely see past the cup of coffee on the desk. :D

[diesel298]

Got everything under control there, Ray? :lol:


yeah.. all good now
thanks :)

[nblehm]

Wow... :lol:



yeah serious