[RAC65]

Hey guys, new to the site but not necessarily new to cub cadet tractors. This might be on the site somewhere but I've been unable to find. How many issues will I run into swapping a 169 hydro transaxle into an 1864? I have a 169 that I've had for years and an 1864 that I gave $200 for on Craigs List last summer (supposedly non-running). Turned out all the 1864 needed was a head gasket and ignition switch.
Many years back I built a cat O 3-point with a 3X6 inch lift cyl. for the 169 that bolts on as a unit in place of the rear trans cover. I'd like to thin the herd a little and the 1864 runs smoother, is quieter, has more power and power steering. But I don't believe the aluminum transaxle in the 1864 is up to the task of handling my 3-point hitch tiller (36 inch FMC w/ its own 18 hp engine). I'd estimate the tiller to weigh +/- 400 lbs. I have to put about 240 lbs ballast on the front of the 169 when its mounted to make it manageable.
Will the charge pump in the 169 handle the power steering in the1864 chassis? Not too worried about driveshaft, have access to mill and lathe, can make anything. Linkage issues??? (haven't taken covers off to compare side by side)
Thoughts???