I have a III with a BorgWarner tranny that I need to replace the I/O because there are no parts available and I believe I lost a gear tooth in the lower.. Does anyone know if a TR/TRS would bolt into my gimble? I am completely confused by some postings that say they are the same and some say they aren't and after spending $ on another unit a 1/4" would screw my pooch so what do I need to look out for?
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I broke the halfs apart and the lower case spline is 1 1/8" with 17 splines. The prop shaft is 1 1/2" with 23 splines. The ratio is real close to 1.3:1

from what I hear the ssm 3 is a TRS upper. the 3a is completely different.

I do not have a SSM III. It is a mercruise III. NOT alpha, not bravo. They made these with a BorgWarner tranny before trying to make their own tranny.
Thanks anyway.

Konrad Marine makes a direct replacement for the old Merc III (spins 20" dia prop) bolts directly to the Merc III gimbal. $9995. Feel free to call for more info Kurt 715 410 0735

-TR/TRS are entirely different units and will NOT work for your application.

I've been looking at konrad but they only list TR and TRS not the Mercruise III.
The 520 = TR and 540 = TRS
if the TR and TRS dont fit how will these replacements?

It's not listed on their website, It's a PRS III fitted with the 520 lower gear case. -I'm a factory rep for Konrad and handle the majority of Merc replacement applications.

Well no answer here so I going on a 10 hour trip to find out if a TR\TRS upper will bolt to a mercruise III gimble.

Cheers


The answer is NO, the six studs are slightly different spacing. The top two are 2 9/16" on the III and 3 1/16" on the TR.