Does it look like this slide out gear/motor assembly used in the 05 Dolphin.
If so, I had problems with the brass gear losing teeth. I tried a steal replacement gear but is too brittle and also broke. The gear needed was a Martin WB1220 that requires the bore to be drilled out from 1/2" to 5/8" and a 1/4" hole drilled for the roll pin. I found replacement gears in brass or steal but that was 4 to 5 years ago now, I see they are still listed.
https://www.motioncanada.ca/productDetail.jsp?sku=00367424
Ellen & Greg
08 National Dolphin DL-35Ci, Kelderman Air Ride, Rear Trac Bar
Workhorse W22, RoadMaster Rear Sway Bar, Towing 08 Smart Car