Gear Retraction on Take Off

[JeffAxel]

My POH for a '77 T337G says the penalty for gear down amd locked, doors closed is the loss of 110fpm climb on one engine. The plane will climb on either engine with the gear down amd locked with the doors closed. It will just maintain altitude with the gear in transit if everything goes right. The aforementioned -240fpm is what my POH says as well as the penalty for gear in transit. I am sure loosing the big main gear doors helps some as far as drag goes, does any of the paperwork that comes with the STC say what the difference is?? That would be useful information.