Product Overview
This is a NEW Flywheel Ring Gear for IH Tractors.
Replaces part #: 396421R1
Inside Diameter:  12.326"
Outside Diameter:  13.456"
Teeth:  133
Fits IH Tractor models:
HYDRO 70 - with C-291, D-312 Engines
 HYDRO 86 - with C-291, D-310, D-312 Engines
 504 - Gear & Hydro Drive W/ D-188 Engine S/N 13676->
 544 - with C-200 Engine
 656 - Gear & Hydro Drive W/ C-263 Eng. / Hydro Drive W/ D-282 Engine
 666 - Gear & Hydro Drive W/ C-291 Eng. / Hydro Drive W/ D-312 Engine
 686 - Gear Drive W/ C-291 Engine
 
 2504 - Gear & Hydro Drive W/ D-188 Engine S/N 13
 2544 - with C-200 Engine
 3500A - with C-200 Engine
 3514 - Gear & Hydro Drive W/ D-188 Engine S/N 29
 3514 - with Synchromesh Trans. W/ C-175 Engine
 3514 - without Hydra-Shuttle Trans. W/ C-153 Engine
 8000 - Forklift W/ C-200 Engine
I've been rebuilding IH tractors for over 30 years, email if you have any questions and I can probably help you.