Ed, the OD on the rear planet ring gear is exactly 5 inches
so cleaning up your tube should work.
However the bearing is 130 MM or 5.118 OD so we will need to
sleeve the ring gear with .118 thick sleeve. The tubing will need
to be bored to 5.118 ID dimension about 5 inches deep.
The set screws going through the sleeve into shallow recesses in
the ring gear. This is for the rear planet set and 3.12:1.
For the 2.85:1 front planet version the sleeve would be somewhat thicker.

The shafts in the front planet will need to be EDM'ed out to .375.

I have a 2.85:1 front planet carrier in stock. Do you want me to put that in the EDM shop? It will cost around $150,


Paul Lamar