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Old October 15th, 2007, 03:35 PM   #1
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Question Are my gears Standard Cut (LP) or Reverse Cut (HP)?

Don't you just hate it when you find some gears and don't know what they hell they are? Well, determining whether they are Standard or Reverse cut can narrow down what they came from and what else they can be used in.


Below we have a picture comparing the two designs. Note the difference in the direction of the gear tooth spiral. The gears on the left are Standard Cut (low-pinion) and the gears on the right are Reverse Cut (high-pinion).









To be continued...
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Old November 2nd, 2008, 08:08 PM   #2
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with all this said, could you take a dana 60 rear, cut of the tubes, and put 44, or other 3 inch tubes for a front and build a 60 front, or would this not work? just curiuos to know
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Old November 2nd, 2008, 08:18 PM   #3
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with all this said, could you take a dana 60 rear, cut of the tubes, and put 44, or other 3 inch tubes for a front and build a 60 front, or would this not work? just curiuos to know
That seems like a ton of work, but I don't think that you would get sufficient lubrication to the pinion bearings. (off the top of my head, so it's a guess)
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Old November 2nd, 2008, 08:22 PM   #4
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ok thanks
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Old February 2nd, 2009, 04:58 AM   #5
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so could i run a low pinion, sandard cut axle in the rear of my jimmy or would i take off in reverse when i put it in drive?
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Old February 2nd, 2009, 08:20 AM   #6
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so could i run a low pinion, sandard cut axle in the rear of my jimmy or would i take off in reverse when i put it in drive?
It doesn't matter which type you use as long as you don't flip the axle upside down. Have you ever looked at what your Jimmy came with?
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Old February 2nd, 2009, 11:47 AM   #7
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yes and that is why im upgrading its the s10 style not a k5, great info by the way. Thanks
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Old February 2nd, 2009, 12:54 PM   #8
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yes and that is why im upgrading its the s10 style not a k5, great info by the way. Thanks
I'm asking you if you looked at which gear design your current axle is before asking if a standard-cut, low-pinion axle would work in your vehicle. I'm thinking that if you had looked at your rear axle, you would not have asked.
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Old February 2nd, 2009, 02:51 PM   #9
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[QUOTE=Reverse cut means LH pinion gear spiral and clockwise rotational input when facing the flange. Most (if not all, i'm not really sure) rear wheel drive automotive axles are RH spiral for counter clockwise rotational input..[/QUOTE]

No i have not. just want to make sure i bought the correct axle
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Old February 2nd, 2009, 03:26 PM   #10
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Reverse-cut axle pinions turn the same direction as standard-cut axles in the same position in the vehicle. The pinions turn different directions front-to-rear in order to travel in a particular direction regardless of the axle type because the axles in the vehicle are facing in opposite directions. That guy you quoted is wrong.
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Old February 2nd, 2009, 04:53 PM   #11
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Thank you, made more sence the way you put it
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Old February 3rd, 2009, 01:48 AM   #12
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Thread cleared up for clarity. HP (High pinion or reverse cut) differentials turn in the same direction as standard cut (some call them LP or low pinion). You can conceivably take a front and use it as a rear axle (some people have). You can also use a rear D60 (or 44, etc), and add inner "C"s, the correct length tubes and shafts, etc, and turn it into a front axle. This also has been done many times.

You usually can't flip it upside down, as that would cause it to rotate the shafts in the opposite direction as you would need, not to mention the pinion bearing wouldn't get lubed. (this is to clarify the john.colling post above.
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Old February 3rd, 2009, 01:57 AM   #13
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So in theory I can take a $150 rear D60 from lets say a late model Ford and rebuild the ends into acceptable C's and knuckles for a front axle? Is there any benefit to this as to say if you can't find a front D60 already?
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Old February 3rd, 2009, 02:07 AM   #14
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Yup.

In theory.

But it can get pricey, and you usually spend quite a bit for D60 front end parts. Don't forget that there most likely won't be enough axletube for your long side, either, so you will have to retube at least one side. You also will need axleshafts, and the D60 rear will most likely have a 30 spline carrier.

It can be done, however, but it is usually best to pay next to nothing for the rear D60- they are plentiful enough. It is a decent way to go if you have plenty of time, and want to build the axle up to your own specs, or if you have a line on D60 front parts.
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Old February 3rd, 2009, 10:24 AM   #15
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Quote:
Originally Posted by MiNi Beast View Post
So in theory I can take a $150 rear D60 from lets say a late model Ford and rebuild the ends into acceptable C's and knuckles for a front axle? Is there any benefit to this as to say if you can't find a front D60 already?
Like Cooter said, it can technically be done. Personally, I don't see it as much of a shortcut and I wouldn't hack up a late-model anything that would probably have discs on it already. Aside from the cost that will add up, finding someone that wants to cut up a D60 or finding one that has something wrong with the center section (and didn't damage the shafts) is the bigger challenge. I don't think its worth it. Unless you want to put together a 609 or something, just save your money and buy the right axle for what you are doing.


I think the biggest contributor to the confusion that causes all these questions about flipping axles, HP's spinning the other way, etc is the perpetuation of the incorrect phrase "reverse rotation" by shops, a variety of gear vendors, and the general public. (It really annoys me to see gear vendors use incorrect terms on their sites.) Nothing in a HP axle rotates in reverse. The gear teeth are cut in a different direction and the pinion engages the ring gear at a different point. "Reverse cut" is the proper terminology.
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Old February 3rd, 2009, 02:01 PM   #16
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Alright then thanks guys!
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Old June 5th, 2010, 05:15 PM   #17
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forward is forward no matter how you slice it. Its just that if you flip a low pinion or high pinion you will drive the gear on the coast side of the gear and not the drive side of the gear. As far as lubrication if your not bangin down the highway in it and generally use it for trail riding it will be fine.
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Old June 5th, 2010, 08:19 PM   #18
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forward is forward no matter how you slice it. Its just that if you flip a low pinion or high pinion you will drive the gear on the coast side of the gear and not the drive side of the gear. As far as lubrication if your not bangin down the highway in it and generally use it for trail riding it will be fine.
Uh, no. Flipping your axle over will result in your tires turning the wrong direction in any gear. When you are in a forward gear, the rear axle will try to propel you forward and the front axle will try to push you backwards (and vice versa).

Last edited by PävementPounder; June 5th, 2010 at 08:27 PM.
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Old June 5th, 2010, 08:23 PM   #19
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Uh, no. Flipping your axle will result in your tires turning the wrong direction in any gear. When you are in a forward gear, the rear axle will try to propel you forward and the front axle will try to push you backwards (and vice versa).
damn, i'd love to see that.
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Old June 5th, 2010, 11:19 PM   #20
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Originally Posted by PavementPounder View Post
Uh, no. Flipping your axle over will result in your tires turning the wrong direction in any gear. When you are in a forward gear, the rear axle will try to propel you forward and the front axle will try to push you backwards (and vice versa).
My friend you are incorrect! the driveshaft still turns forward or reverse. anyway you put the axle on the driveshaft will still turn the same way hence. Forward is forward and backward is backward. Your tires will still drive forward in drive. you just will drive the weight of the vehicle on the coast side of the gear. Think about it.
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