My 342 (twin 502s) steering seems extremely tough at all speeds ! Fluid levels OK, internal steering with Imco tie bar, no visible leaks .
Any ideas or suggestions??

I had the same problem at the end of '07. Everything appeared fine, no leaks, fluid level good, etc. It was the P/S pump. I couldn't figure it out since, to me, the pump was fine. It wasn't, I bought a new one from Autozone.com and put it on...everything back to normal. Good luck !

Rock

bad cable