ssm #3 extension box question
 

im looking to put some extension boxes on my 35ft mistress this winter when i install my blower motors. do the extension boxes bolt right up to the holes in the transum the the drives used or do i have to redo the transum for new holes. should i keep the drive heights the same as they are just move them back via the boxes? will i have to change the tail housings on my bw 72c's? what does a rigging shop charge to due this? thx for any info, ratman

Re: ssm #3 extension box question
 

increasing your set--back will lower your x-dim. more so depending on your transom angle. your x-dim. (my bet) is currently too low to take full advantage of modern propeller technolgy.

measure your current x and then calculate it for the box your installing. if not done right boxes can loose ya speed...they really don't bolt on speed like many would think.

Re: ssm #3 extension box question
 

The trans cannot be converted, it is differant. Boxes are great, but not unless you adjust the X as Joe says. Might be time to look for some 5's. Don't forget the steering too.