Not even close. If they were the same a T90 would bolt up to a 258 without an adapter. An adapter is not made to bolt a T90 to an AMC engine. That link samson gave you at Novak was to bolt a T90 to a General Motors engine, specifically a Buick V6, Chevy V8 or I6.
Only the AMC staright sixes and V8's share the same bellhousing bolt pattern.
There are plenty of light duty, inexpensive three speeds out there that will bolt to the 258. The most widely used would be the T150. The T14 and T15 can also be used behind the 258.
Last edited by CSP; 05-20-2003 at 10:15 AM..