Does anyone know what years that Mercruiser used the MerCtrans II and what years were the B/W trans used? The reason why I ask is my engine is a 420 HP 454, which from what I understand was produced 87-89. The trans that I have is the MerCtrans II. And from what I can gather, Mercruiser went from the Mer trans to the B/W before 87. The boat is a 78. So is this the correct trans for this year model engine? The only serial # that I have found is on the top of the bell housing. The serial # is 0014128, model # MOM-E.
Thanks

MerCtrans was used by Merc. mostly with small block Chevs. and 330 HP big blocks through the late 70's and into the early 80's. I have never seen the factory package that Cyclone 420 with the MerCtrans. (although I can't swear that it NEVER happened) My guess is that the transmission is probably what came with the boat but the engine was upgraded somewhere along the line. --- Jer

I am with JP on this one. Your engines were upgraded at some point.....

Jon

this is kind of informal but i've never seen anything above a 330 trs that came originally rigged with a merctrans; all staggered installations and 370 cyclones and above were borg warner
good luck
jeff

Lots of great info, Thanks guys

Repowered a 38 Scarab 1982 boat, had the merctrans. Also Bought a 1983 454 trs motor with trans and it was a borg. It's my belief that all '83 and up were Borg's . BBB

M y1982 Excalibur Hawk came with 400hp Cyclones and the b/w 72c trannies

my 79 377 came with b/w 72s, but staggered motors

82 Donzi 22 Classic, 330/ Trs/MercII

Once again, I believe JP is correct. The MercTrans was offered on the 280hp small block and 330hp 454.

370HP and up were mated to the Borg Warner 71 and 72 series trannies.