Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: T18 A identification
Welcome to the board! What are you building?
The easiest way to tell the T18A from the close ratio transmission is to shift it into 1st gear and turn the input shaft. If it takes over six turns to make the output shaft turn once, it's the wide ratio box. The close ratio version is about 4:1.
If it's in a vehicle that won't run I don't know of any sure way to tell, but if you post what vehicle it's in, someone here can probably tell you which transmission was used. I think that International Scouts used the close ratio version, and Ford trucks used the wide ratio, for example. All Jeeps used the wide ratio.