impeller side enclosed bearing, GM-N-20
can be used as an enhanced replacement for the impeller side bearing in the GM 300mm
. It may also be the better impeller side bearing option in the GM Late 4L80-E
(single stator) converter.
Several customers told us that they were having problems with the impeller side bearings in the GM 300mm unit (GM-N-18
). After researching this issue and comparing the GM-N-18 to the similarly sized GM-N-20 bearing, we believe the GM-N-20 is the better product for the impeller side bearing. As the races associated with the GM-N-20 are thicker, material must be machined off the back of the stator when used to replace the GM-N-18 bearing. The inside diameters of both bearings are the same. We recommend continuing to use the GM-N-18 to replace turbine side bearings in the GM 300mm due to their low failure rate and since the turbine side stator cap is already fairly thin.