If the gear that you removed and was previously used was a 15 tooth gear like you suggest, then you will need to use the 15 tooth gear:
-Replacement Gear Pack for Lippert RV Slide-outs w/ 2" x 2" Arm # LC281331 for the proper replacement.
The 18 tooth gear will not work on your 15 tooth shaft as the number of teeth won't match and they won't be compatible because of it.
Lippert does suggest that if your slide-out was manufactured before 2013, then the 18-tooth gear # LC122739 is needed... view full answer...
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