installing speedo gear help?

i've been meaning (for the last 6 years lol) to install a new speedo gear ever since i did 3:73.
I could of swore there was a write up for instaling a new one, but i'm having trouble finding it. I don't remember if it was on the driver or passenger side of the tranny. and if there was anythign else that needed to be done.

Thanks
Joe
 
well my car is dropped and i'm fat so i have to jack her up high if i have to get under her

~Eric~ i only had one bolt and it was 11mm. you sure your talking about your mustang?

thank God i finally switch this out cause my stock gear was chewed to hell i think i had about an 1/8 th of an inch if not less of teeth going around the outside edge.