Hey cgbemis,
it is the early model w56 with the aluminum center plate as apposed to the cast style.
This is a 1985 model W56. Nice grab
Should I replace the aluminum piece with a cast one? Has Marlin had serious issues with these older style aluminum sections hogging out?
No, this is not necessary at all. In fact when I rebuild my W56, I will swap out the cast iron center section for an aluminium one to save weight. I once asked Marlin about any strength concerns and he said he has never seen an aluminum center section wear out. However, the '85 W56 also features aluminum shifting forks. And while these are nice to look at, lighter, and a stronger material than steel, they wear out faster than the steel forks with brass finger pads. This almost seems crazy, how can aluminium wear out faster than a soft metal like brass? Well its because of the properties of "like metals." Steel on steel will last longer than Aluminum on Steel. And Brass on Steel will out last Aluminum on Steel.
But I wouldnt be so worried about your aluminum forks. Yes we see them worn out on tear downs, but they still last well over 150+ miles. But knowing that your tranny is used, replace your shift handle nylon socket and then check to see if there is excessive play between gears.
Would a center section from another style of w56 fit, or is the aluminum one of a specific design?
Yes, they are completely interchangeable.
Finally, if I was to replace this center plate with one from another w56, which one would be best, (IE, are there w56's with larger bearings than the one I have)?
Nope, they all use the same bearing ID and OD through all of 1985-1995, both early and late models. When Marlin rebuilds a HD W56 he has out sourced same ID and OD upgraded bearings with much more static and dynamic ratings.
Regards,
BigMike
