i blew the motor today in my 3t, it has a very good undercarraige, i have a 17a with a good motor and shot undercarraige, would it be easier to change the motors or the undercarraige. the 17a also has a broke main spring and a bearing out in one of the finals, if i change motors will i have to change the trans also,the 3t has a dry clutch so i want to change to the 17a oil clutch will it all work? any help would be great.