Powered RV steps that still operate but that make bad mechanical noises may not need a new motor, but you're right that it is likely you'll need a new gearbox and/or linkage. There are two possible kits for your step unit.
Part # LC379161 is the B style linkage for the Kwikee Step Series 28, 31, 37 and 39. This is Kwikee part number 1101426.
Part # LC379162 is the C style linkage for the Series 26 step, Kwikee part 1101427.
My contact at Lippert/Kwikee said that on the bottom of your... view full answer...