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When I did this project I couldn't find any real answers on fitting a long crank up to a 4l60e transmission. there was lots of no you can't, there was some who said they made 1/4" spacers and a couple posts of getting a custom torque convertor made. However for my Jeep TJ Ls Swap I can assure you that it is possible to mount the 4l60 torque convertor to a long crank ls engine by simply machining the snout down.