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THere are two types that I know of .Manual and Electric.Cost of the parts and all related hardware manual for two trannies was 2200.00. Im sure you can do better on the price.They are sitting in my closet behind me and Ill tell you why.The manual style is kinda like a choke cable you pull up and they lock in place.If you forget to disengage push them down and you and you hit the throttles you just lost a trannie.It happens more often than you think.I know of two cases fried trannies.they are simple to install but a Mofo to get to the trannies.They come with instructions and dos and donts.I have 2 380 Cummings with ZF and I just took a little pitch out of the props and went from 4kt at idle to 2 kt at trolling live bait.I did sacrafice a little top end but so what,If your not trolling for marlin with live bait or big tuna why do you need to have trolling valves??If we need to get any slower we just shift in and out of gear.I talked to ZF about shifting in and out of gear 50 times a day and there answer was so what.I know I didnt answer your questions but give you my point of view.You loose a trans over doing something dumb its 5 to 6k hit.Me being dumb and old isnt a good combo to have to remember to disinguage the trolling valves when you got a 500 lb black marlin hooked up and you fire wall the throttles,good luck.
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