Hey DK,
Transmission: I just upgraded my 84 G52 to a W56... fits perfect with no modifications needed (bolts right up).
![Thumbs Up :thumbs:](https://board.marlincrawler.com/Smileys/marlin/thumbs.gif)
I upgraded my clutch with Marlin's Super Heavy Duty clutch at the same time with a .026 step on the flywheel. As far as strongness, there is a post around here that has the specs on durability. G52 is the weakest (G54 is a step up), W56 in the middle, and the turbo R150/R151 as the stongest. Marlin will also do a HD Transmission for the W56.
http://www.marlincrawler.com/trans.htmlTCase:You will need to get a top-shifting TCase or convert your forward shifting tcase!!! And... You will also need to cut the floorboard about 4" back from the original position of the TCase. I used a piece of sheetmetal from Home Depot ($5) to cover the cut out area of the transmission and TCase.
Do a search on "W56 G52" and it will have atleast 4 pages of info for yah.
FF