Find the correct gearbox, motor parts or complete step for a Lippert Kwikee Series 28 electric RV entry step. The factory drawing identifies the straight B-linkage arrangement. Compare it with your step's label before selecting any replacement.

28 versus 28ASeries 28 uses B-linkage gearbox 379161. Series 28A uses a curved A-linkage, 379160.

Complete step or partsGearbox-only, motor conversion and complete step assemblies include different components.

Original motor/controlOlder Kwikee controllers and later motor assemblies require the appropriate replacement generation.

Kwikee 28 Series B-linkage factory parts drawing

Lippert's illustrated step parts chart identifies the motor at callout 1, pin kit at callout 2 and straight B-linkage gearbox at callout 4. The same page separately identifies the curved A-linkage at callout 3 for models including Series 28A.

Lippert Kwikee Series 28 callout 1 Later IMGL-II motor, service part 676061 — Factory drawing and Series 28, 31, 37 and 39 part numbers, manufacturer manual page 4. View the full-size factory parts drawing.

Lippert Kwikee Series 28 callout 2 Clevis/cotter pin kit, service part 379178 — Factory drawing and Series 28, 31, 37 and 39 part numbers, manufacturer manual page 4. View the full-size factory parts drawing.

Important model distinction: Series 28 and Series 28A are not the same gearbox family. Use the number on the original step frame, not just the resemblance of its linkage or tread.

Series 28 electric step replacement parts

These factory part numbers identify the mechanical linkage, original service components and complete step packages. Always match the installed control generation before ordering a motor conversion.

Diagram / model	Lippert number	Component and selection	Product
1	676061	Motor and screwsLater-generation motor reference; compare original motor plug and controller before buying.	—
2	379178	Linkage clevis and cotter pin kitPins used to secure the correct gearbox linkage.	View part
4	379161	B-style gearbox and linkageLippert identifies this for Series 28, 31, 37 and 39; the 28A uses a different A linkage.	View part
Frame	3747457	Series 28 step frameManufacturer frame-only reference, not a complete powered step.	—
Motor kit	379769	B-linkage motor and control conversionA separate upgrade package. Verify the original motor/control generation and exact kit contents with Lippert before ordering.	View part
Step	3747452	Complete Series 28 step without switch kitFactory assembly listing includes logic control; switch kit is not in this package.	View part
Step	3747453	Complete Series 28 step with switch kitFactory assembly with logic control and a power-switch kit.	View part
Separate model	374923 / 379160	Series 28A uses A-style curved gearboxSeries 28A is not the same as Series 28; check the full step label.	—
Door input	379407	Pleated-plunger door switchSwitch type and contact logic depend on original controller. Not a universal Series 28 replacement.	View part

Kwikee Series 28 gearbox, pin kit and complete step photographs

Select a product photo to see its exact part number, contents and price. The B-linkage gearbox is a mechanical replacement; it is not the same package as a complete motor/controller upgrade.