Originally Posted by Provocateur

Some people remove the speed sensor and use that hole to fill. Some people remove the little black cap off the spigot on the top of the tranny and others will pump in the fluid from underneath into the filler hole.

According the the Helms, the proper way to do it is to use the filler hole above the drain plug on the bottom of the tranny and pump it in.

Personally, I take the cap off the spigot on top and fill it up there.

Any method will work, but I advise against the speed sensor as people have been known to break them or lose the little speedo gear when removing it.