How much horsepower will a TRS handle?
 

How much horsepower and torque will a TRS handle? What is the maximum rpm limit? What rpm limit should I set my ignition at?

Depends on weight of boat, twins or single and how you drive it.
I have had 600HP in front of mine for 5 years and spin it to 6500 occasionally but 5700 quite a bit.
These are on a twin 30' boat. Had a friend that had 750HP in front of them in a 38' 1986 Top Gun and they didn't fair as good. But that was driven hard!
And upper gear still look great after 12yrs since I purchased it. Just looked at them yesterday.

I have prop shafts! L.H. and R.H.
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trs lower case
 

got a good used empty lower case mike708 308 9584