820 pulley speed?

I currently am runninga peerless 820 with a 3.5 in the front and a 4 in the rear.  I want to change the front to a 5.5 or 6 inch, but i didn't know if that is too hard on the transaxle.  Any advice?

Belt tension and like you mentioned shaft speed.  One thing many people have done is drill and tap a hole into a good solid part of the case that contains that shaft.  Tap it for a grease zerk and grease it time to time.  That should help.

Will keep that in mind.  Thanks!

Here's where I put the grease zerk in my MST. Be sure it will clear where the bearings are.

If you want to spin that 820 at high speed, I suggest converting it to oil and add a vent. The grease flings off the gears at high speed, where the oil will drain and re-coat better than the grease. Don't forget an oil seal on the inner side of input shaft to keep the oil in. The vent keeps the transaxle from building pressure when it gets hot.