I use a socket to get the top drive gear off...slide the socket over the shaft. Hit with hammer, the pin should sheer right off. (she's a tight fit~)
Also, I've had a few of those roll pins break. I replaced it with a 1/16 drill bit. (you read it right. I replaced the roll pin, with a drill bit.)
"drilled" the bit into place. then used a rotory tool to cut it to the right length. (the one shown in the photo needed a little more trimming down.)
ERBE(RX8-T8-trx2075): MBX6-Eco(RX8-T8-Sav1268sg): SC8e(MMP-1515-stock): STRC Slash4x4(TBH LT4-SC411-Sav1258tg):
STRC Slash2wd(MMP-SC411-1258tg): SlashMT-4x4(SC8-WP-1415-hs5646wp): Pede4x4-Truggy(MMP-1410-Sav1256tg): Mini Revo(SV3-Velineon380-hs5086wp):