Have my 4-175 jsut about completely disassembled atm. In dire need of a ring and pinion for the front housing. Stamms don't have one, Maibach tractor is in the process of taking one apart to find out if it's any good. Need this tractor back together as it's set up to carry a 750 gallon spray tank while pulling our sixteen row planter. 

Also need the carrier for the pilot bearing. Ring, pinion, and carrier are all discontinued by Agco.

Part numbers are:

Ring  30-3069508
Pinion  30-3064069
pilot retainer  30-3302431

Was wondering where to try next if Maibach doesn't have one. Would really hate to junk this tractor out just because of a bad pinion.