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Kcaz25
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Big Diff - 01.16.2014, 11:00 AM

I am in need a big diff for 1/8th scale. It would be a bonus if it had an optional aluminum case from the after-market. Another bonus if it has a smaller tooth count like 41-45t. Neither of these are needed. It has a big space to fill between the bearings. It will take the place of a general silicone diff.

Thanks,
Zack

Last edited by Kcaz25; 01.16.2014 at 11:10 AM.
   
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01.17.2014, 12:04 AM

The ofna ultra diffs are the biggest I know of. They do have optional aluminum cups, but unfortunately are 51 tooth spurs. I used one as a direct replacement for an LST tranny. The ends of the output shafts were actually 2-3mm wider than the tranny.

I don't have any on hand to measure for you, sorry.


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Kcaz25
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01.21.2014, 09:19 AM

Does anyone know if a smaller spur will fit that diff.

They do look big Harold thanks. Spur gears all look similar, can you mix manufactures? Cups and spurs? Just four screw holes and a seal line for the cup right? Anyone tried mixing them?
   
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MonsterMaxx
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02.07.2014, 09:37 AM

You want big, go with the Losi 5ive diffs. They are twice the size of 7.5 diffs.
   
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Kcaz25
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02.07.2014, 03:38 PM

Thanks thanks for all tips!

Robin,
Is this Losi 5ive diff longer? Bearing to bearing? I doesn't really look all that big. A comparison pic would be cool. Or is that asking too much?
   
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Kcaz25
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02.08.2014, 11:03 AM

The above questions still stand, but what about this diff? Ofna 9.5?



Looks big!
   
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Lizard
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02.08.2014, 05:00 PM

The losi 5ive diff is a lot bigger, it's 1/5 scale. But it will probably use Mod 1.5 spurs so you need a Mod 1.5 pinion also.

What are you trying to achieve? Does it need to be strong or just big? Where do you want to use it?
   
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Kcaz25
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02.08.2014, 07:02 PM

Mod 1.5 pinions are okay as long as they will fit a 5mm shaft. It doesn't need to be very extremely strong, it just has to fill a large space between the bearings. If it is alittle short I can shim it.

Also I wish I knew what spur gears from different manufactures would fit what cases. In other words mismatching spur gears and cases.
   
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Kcaz25
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04.18.2014, 10:26 PM

I have discovered that with alot of shimming both the HPI/HOTBODIES and OFNA 7.5 diffs will fit. I need to order some shims. I am the hotbodies diff has an optional 40t spur like I want but it can never be as awesome as the OFNA 7.5 diff with its 8 gears and nice 2 part case. What I want to know is if the OFNA hyper 9 8 gear spurs will fit the 7.5 diffs? The hyper 9 has a 40t spur. They have the same 6 bolt pattern.

Thanks,
Zack
   
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