My e-revo brushless edition build

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I will use Traxxas Summit shafts all around this ERBE. I also want them for the center shafts. I put two set screws on either end of each shafts with blue Locktite.

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8th SCALE CENTER DIFF

The 8th scale center diff in a Revo all started with a guy naming himself ‘’CowboyRay’’. He made an 8th scale CD using a Thunder Tiger TTR S3 buggy center differential. His design required extensive machining to be done and was financially out of reach of many. Some people tried to take over this design and tried to market this CD but the financial aspect was a problem again. It was just very expensive to produce and the sale price was high. Cowboy made and sold a few hundreds of them and then stopped when Traxxas came out with their own version of a center differential with rear brake. Then I saw on the RC Monster forum a guy named ‘’sjcrss’’ made an 8th scale center differential with parts of an Ofna Hyper 7 buggy CD that did not require the help of a machinist or machining equipment. Having at least a drill press or access to one helps a lot though. The hardest part of making this CD is definitely making M3X.5 threads in hardened steel.
So I went with sjcrss’ idea of using the hardened steel spur gear as the diff cap and CowboyRay’s idea of using Thunder Tiger parts. I modified the ERBE’s output gear TRA3984X and I modified these two parts, TRA5415 and TRA5416. They are the output shafts for the Revo 3.3 center diff.

The Thunder Tiger spur gear PD1893

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The Traxxas TRA3984X output gear


The Traxxas TRA5415 and TRA5416 output shafts



The Thuder tiger diff parts, diff case PD1897, diff gear set PD1895



The modification done to the Thunder Tiger PD1897 diff case



The final product

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ZERO SLOP 17 MM OFNA ADAPTERS

The Ofna adapters are tough and cheap. The Traxxas adapters are very similar except for the splines. Both of them have slop that gets worse with time because they get grinded by the threads of the stub axles. There are other systems out there that require the use of 8 mm stub axles or stub axles with no threads but they end up being expensive, although they are very good. Also there are cheaper styles that work great but I started with Ofna before any other systems came out and with the modifications I did, they have been working so well that I don’t see why I should change anything.

GETTING RID OF THE SLOP

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GETTING RID OF THE LOCKTITE

Here's a couple things I do to stop the need for Locktite. Some slots Dremeled in the nuts, they bite in the wheel's plastic and they don't come of by themselves and a groove around the adapter for an O ring to keep the set screw from backing out. This has been race and bash tested for a long time. It works.



I mount the adapter on a spare stub axle so that I can chuck it in the drill press. I make it turn at medium speed and with a cut off wheel on my Dremel, I can make a clean groove for the O ring.

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SPECIAL TOOL

I made a simple tool to screw in or out the little tubes I made. It works great and doesn't damage the part like a flat head screw driver can.

Hi, I've been scrolling thru your notes here. Im new on this forum or to any I should say. I have to tell ya! You opened my eyes to a whole new way of looking at my revo! Ive been bac into RC for about a year and searching this dam computer for fix's, how to this, how much that, I dont have a big support network built up, but Its looks to me like, You just have to try it, break it, build it, tweak it. Like your style! The Ofna hub thing is slick. Anyway I bought aluminum outer dif cases for a revo and Im about to put em together,Im having a hard time deciding oil wt for the F +R. I want to have a crossover revo if u kno what I mean. hardcore offroad/street? is it possible?

Hi, I've been scrolling thru your notes here. Im new on this forum or to any I should say. I have to tell ya! You opened my eyes to a whole new way of looking at my revo! Ive been bac into RC for about a year and searching this dam computer for fix's, how to this, how much that, I dont have a big support network built up, but Its looks to me like, You just have to try it, break it, build it, tweak it. Like your style! The Ofna hub thing is slick. Anyway I bought aluminum outer dif cases for a revo and Im about to put em together,Im having a hard time deciding oil wt for the F +R. I want to have a crossover revo if u kno what I mean. hardcore offroad/street? is it possible?

Hi, I've been scrolling thru your notes here. Im new on this forum or to any I should say. I have to tell ya! You opened my eyes to a whole new way of looking at my revo! Ive been bac into RC for about a year and searching this dam computer for fix's, how to this, how much that, I dont have a big support network built up, but Its looks to me like, You just have to try it, break it, build it, tweak it. Like your style! The Ofna hub thing is slick. Anyway I bought aluminum outer dif cases for a revo and Im about to put em together,Im having a hard time deciding oil wt for the F +R. I want to have a crossover revo if u kno what I mean. hardcore offroad/street? is it possible?