HPI 4 Bevel Gear Differential Conversion Set

Questions about Hop Ups for the Savage.

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WyldOne
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HPI 4 Bevel Gear Differential Conversion Set

Post by WyldOne » Sun Dec 23, 2012 2:11 am

I have 10262 HPI "Bulletproof" Ring/Pinion Gear Set (29T/9T), 86827 HPI Alloy Differential Case. Now to pick the bevel gears. What do we think of the 87193 HPI 4 Bevel Gear Differential Conversion Set? Opinions and suggestions please.

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LLkoolskillet
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Post by LLkoolskillet » Sun Dec 23, 2012 8:32 am

Hot bodies steel bevel gears would be my choice

HBC80101-1
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Ascender
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Post by Ascender » Sun Dec 23, 2012 10:03 am

Better yet, seek out a set of GPM hardened steel differential gears.
The HPI and Hot Bodies gears are both molded, and are pretty weak. The GPMs are machines from a billet, then hardened, the same process used for the Bulletproof ring and pinion. They are, for practical purposes, unbreakable.
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xtremesavage
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Post by xtremesavage » Sun Dec 23, 2012 5:21 pm

I run stock now,,I have plenty of xtras because the fail often

Ive seen guys liking the HB gears,,but they dont seem like much of an improvement.

These GPM gears are milled from billet?,,Why doesnt GPM advertise that?,,its a huge selling point...
If they are trully milled from billet,,,,definitly would be my choice.

Sorry Ascender,,Its not that I dont beleive you,,I just cant find where GPM says they are milled billet.
have you found specs on these?
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Ascender
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Post by Ascender » Sun Dec 23, 2012 8:44 pm

Specs, heck. I've got em in my hot little hands, AND in my truck! lol, they are definitely cut billet, and they are definitely HARD. I've got an FLM drive cup with the pin drilled slightly off, so that it's very hard to get the gear off the shaft. I have to use pliers to get the bevel gear out, every time. The GPM gear actually left a gouge in the knurling of the pliers teeth when they slipped off. That's HARD.


http://www.gpmracing-parts.com/shop/sav ... 08064.html
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Post by dragonbat13 » Tue Dec 25, 2012 8:28 pm

I thought the GPM were sinistered steel.  Heated up powder steel then hammered into shape.  I had thought they were billet also,  but found out they were the same as the sinitered heavy duty ring and pinions.
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Post by bifftit » Tue Dec 25, 2012 10:06 pm

i use alot of savage 25 gears, grind a bit off the back and you can shim them like the 2 big gears in a bulletproof diff. everything breaks sooner or later. im just trying to use up all the stuff i already have
2007 HD Ultraclassic +trailor...2000 UMC groundpounder 113ci...2008 HD 1200C (wifeys ride)

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Oh, and Orange Crush!

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Ascender
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Post by Ascender » Wed Dec 26, 2012 11:40 am

[quote="dragonbat13";p="855909"]I thought the GPM were sinistered steel.
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Kharn_El_Traidor
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Post by Kharn_El_Traidor » Thu Dec 27, 2012 6:56 am

[quote="Ascender";p="855924"][quote="dragonbat13";p="855909"]I thought the GPM were sinistered steel.

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Ascender
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Post by Ascender » Fri Dec 28, 2012 6:54 pm

I don't know anything about the silver ones. Do you have a link to the product?

I found mine here:

http://www.rc-mall.net/shop/spare-optio ... p-332.html
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Kharn_El_Traidor
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Post by Kharn_El_Traidor » Sat Dec 29, 2012 7:45 am

[quote="Ascender";p="856080"]I don't know anything about the silver ones. Do you have a link to the product?

I found mine here:

http://www.rc-mall.net/shop/spare-optio ... p-332.html[/quote]ok, thanks ;)

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Post by xtremesavage » Sat Dec 29, 2012 1:57 pm

I cant find any info on these,,Ive looked all over the web.

I'm gonna have to email GPM.

I mean no disrespect,,
but a mared pair of pliers,,isnt proof enough for me.
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Post by Ascender » Sat Dec 29, 2012 8:31 pm

That's fine, man. If they do turn out to be sintered, I will be truly flabbergasted. I see no evidence of them being anything but either billet cut or forged/machined. The spider gears at least are definitely machined, as they show obvious machining marks on the back. But regardless of how they're made, they ARE far tougher than the HPI or HB gears. My truck shattered three diffs in two weeks with HB gears and Vorza cups. With these, the only thing I broke was the little pins, and only because I had a bad starting power setting.
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Post by WyldOne » Wed Jan 02, 2013 6:41 am

I emailed GPM in regards to how their bevel gear is made.

This is what I sent.

"Hello,

I am curious to know how the HPI Savage and Savage X HARD STEEL 4 BEVEL GEAR
DIFFERENTIAL CONVERSION - GPM SSAV1200 is made. I have heard that the parts
are machined from billet then hardened. Could you please clarify this?"

This is their response.

"Dear Lachlan

Thank for your reply

This item make by Steel, and through a special procedure to make it harder.
Pls feel free to contact us with any questions

Regards,
Kenny"
Last edited by WyldOne on Wed Jan 02, 2013 6:43 am, edited 1 time in total.

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Post by WyldOne » Wed Jan 02, 2013 6:42 am

So they couldn't give me a yes or no.

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Post by LLkoolskillet » Wed Jan 02, 2013 9:03 am

It's those darn Chinese lol

I've been tempted to order a set just to check them out. $20 is $20 but I would have to wait at least 3 wks for them
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Post by nitronly » Wed Jan 02, 2013 10:16 am

I order all my gpm stuff from gpm. I live in Canada and it always gets here 2 weeks max or 5-10 buisiness days as they say.

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Post by xtremesavage » Thu Jan 03, 2013 8:58 pm

LOL

That useless answer.
It no help.
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Post by SeeGee911 » Sat Jan 16, 2016 3:19 am

I'm curious about these as well. Do you have a camera that can take a macro shot? You may be able to see tool marks if it's billet. I blow out diffs too frequently. Sigh.

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tpiolds
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Post by tpiolds » Mon Jan 18, 2016 1:58 am

The last post in this is 3 years old.  I can no longer find the GPM bevel gears they were speaking about.  They may have been discontinued.
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