Fuller R46 Roadranger

R46 Roadranger is a 8-speed with 2 reverse speeds manual transmission created by Fuller and used in Chevrolet and GMC cars.

The Fuller R46 is essentially a constant-mesh four-speed main transmission coupled with a synchronized two-speed auxiliary transmission. The separate cast iron cases of the main and auxiliary are bolted together as a single unit.

Constant-mesh helical gears in all forward speeds are engaged by sliding hubs splined to the mainshaft. Shifting of the main transmission is accomplished by a remote control mechanism; the auxiliary is shifted by an air cylinder controlled by a cable located on the transmission shift lever. Synchronizing of the auxiliary unit is by means of a multiple clutch plate while the actual shift is made as in the main unit, through a sliding hub splined to the mainshaft.

Shifting of the Roadranger varies from the conventional transmission with auxiliary transmission or two-speed axle combinations in that split-shifting is not employed. Rather, the shifting sequence involves 8 progressive steps. With the reduction unit in low-range position (down), shift lever is moved from 1st through 4th position. Reduction unit switch is then moved to high range position (up) and the shift lever is returned to lowest gear position. The main unit may then be upshifted through its sequence again. To downshift, the procedure is reversed.

Power take-off openings are provided on both sides of the transmission case. Drive gear has 35 teeth and provides 710 RPM at 1000 engine RPM.

This transmission usually requires 17 pints of lubricant.

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