In­te­grated Mid-mo­tor Trans­mis­sion


To sim­plify construction, lower cost, and in­crease dura­bil­ity, the Volt­age-se­ries chas­sis in­te­grates the trans­mis­sion and mo­tor plate into the two-piece “clamshell”-style chas­sis. The three trans­mis­sion gears are stacked like other 2WD de­signs, but in­stead of hang­ing the mo­tor off the back of the chas­sis, Ar­rma went for a mid-mo­tor con­fig­u­ra­tion to im­prove han­dling and pro­tect the mo­tor from im­pact. The gears are com­pos­ite plas­tic, and the plan­e­tary-gear dif­fer­en­tial is new for the Volt­age mod­els. No­tably ab­sent is a slip­per clutch to spare the driv­e­train from se­vere strain, but the wide gears, steel dog­bones, and thickly molded drive cups ap­pear rugged.

A tough plan­e­tary-gear dif­fer­en­tial is up to the task of ex­treme bash­ing. Steel dog­bones slot into plas­tic drive cups to spin the rear wheels.

Re­move one-half of the mono­coque chas­sis and it will ex­pose the 3-gear trans­mis­sion that rides on a com­plete set of ball bear­ings.

5.9 in. (151mm) 12.8 in. (325mm)

11.2 in. (285mm) 15.8 in. (401mm)

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