Marcos Maniacs

Hi All,
I finally got my replacement wiper motor in this weekend, but am not
sure that it is quite right.
It moves fairly slow and almost grinds to a halt on a dry windshield,
and the "high" speed is even worse and can barely move.
It acts OK with the wiper arms off or on a wet windshield, but I still
wonder if it is right.
I used a replacement motor that was sent to me. It looked the same, but
the origin of the motor is unknown. The only real difference I did
notice is that the main gear in the original has 120 degrees stamped on
it and the replacement had 105 degrees. At first I though this was a
position marker for the gears, however the more I think about it, I am
lead to believe that the number indicates the arc that the wipers will
follow.
Now, if this is the case, would the 120degree gears have more torque and
cover more of the windshield than the 105?
Or, could it actually be a weaker motor even though that part looked
exactly the same?
I am leaning towards changing the gears because I wouldn't think that
they (Lucas) would radically change a 14W motor for each application.
 
Can anyone add their opinion/ knowledge/ experience?
 
I'd really like some second opinions before I go ripping the whole lot
back out to change the gears.
 
Thanks,
Jeff Caraway
#8052 1984 V6 GT