Can anyone tell me what's involved in changing a T/T unit . It appears to me I have to change over the whole swivel unit but I think the shift rod runs down thru the swivel pipe ( sorry this is probably not the correct terminology but hope you understand) The motor I am taking the trim off has the bolt on style transom bracket and I'm putting it on a motor with the clamp on style bracket . Both 1989 60 hp mariners. Thanks !!