and idler gears. The stock slipper uses small pegs inserted into the spur gear and a
spring loaded pressure plate to control torque delivery; the problem is too much
slippage causes the slipper pegs to melt, and the spur will just spin and spin, without
sending any power to the wheels, or the slipper plate will overheat causing the spur gear
to melt in the center. Simple solution is to tighten the slipper fully, though this does add
more stress to the driveline resulting in broken driveshafts and diffs. Best solution is to
skip the out-dated 3906 transmission & opt for the much better 3905 spec transmission.
This is slightly narrower than the 3906 version so will require a small mounting adapter
along one side in order to fix it to the chassis, relatively simple with some basic hand
tools & some 3mm thick aluminium. GorillaMaxx also sell a single speed conversion
kit that removes 1st gear and half the transmission case, an ideal way to save weight and
eliminate the shifting mechanism, though that still leaves you with the weak plastic idler
gear and slipper mechanism- the best option to fix this is to modify the transmission to
use the 3905 spec slipper assembly (http://www.rc-monster.com/forum/showthread.php?
t=11589). Then, add an Unlimited Engineering ( UE ) or Rc-Monster steel idler. The
Erevo spec tranny has all the same features as the Emaxx 3905 tranny. The stock nitro
revo trannies are essentially fine, though there are various retailers offering upgraded
gear sets and such. Locking the nitro tranny into 2nd gear is a painless enough job, and
requires minimal work- see the links thread for a 'How-to' guide.
3. Driveshafts
E-revo, BL E-Revo & Conversions
Very few people have reported issues with the new style of drive shafts, though they are
still possible to twist and snap, especially in cold weather. Traxxas CVDs are a nice
upgrade, though they themselves are not 100% bullet proof as the dogbone pin can snap
under BL power. Being less aggressive on the brakes and throttle can reduce the amount
of stress on these parts.
4. Bulkheads
In all my years of studying revos and revo conversions, I have only ever seen one or
two broken bulkheads, and the new E-revo uses an improved design for even greater
strength, so no worries there. The usual source of problems comes from the possibility if
broken rocker posts, that rarely sometimes snap of, leaving a stump poking out of the
bulk- cheap to replace.
5. Shocktowers
E-revo, BL E-Revo & Conversions
Since they only have to support the shell, they are much more durable and I’ve never
seen a broken one, so again, no worries there. I would be inclined to say stick with stock
or plastic models though, as aluminium versions will only transfer stress to more critical
areas in a crash or flip.
6. Differentials
E-revo, BL E-Revo and Conversions
Traxxas improved the design somewhat with a Revo type sealed diff and additional
spider gear support, but the cup and case are still plastic. Unfortunately there are no
aftermarket cases that will fit at present, though FLM sell a metal cup that will remove
the flex of the stock setup. The only real option for bullet proof E-revo or revo diffs at
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