Sm420 to np203. 00 Add to Cart Show. Aug 19, 2012 · Will pto from a sm420 work on a np205 or np203? All 4x4 Tech & Off Roading NP203 Transfer Case Information The New Process 203 is a chain-driven transfer case. I know that it bolts right up to a SM465, but I already have a SM420. Aug 22, 2007 · Does anyone know if there is an adapter made to mate a SM420 to a NP203 range box? I have been looking around and don't see anything. Comprehensive guide to the GM Muncie SM420 transmission — history, specifications, identification, adaptability, and compatibility for Jeep and GM vehicles. Of course, now I have some other wild ideas (using stock plates between a TH350/TH400 (if they ever came equiped with the TH400) and a NP203) that you guys have opened my mind to. 50 Add to Cart SM465 to NP203 Kit Great for building a doubler Starting at $175. I will have to check up on the output shafts simularities between the SM465 and SM420. :beer: Thanx Dec 26, 2000 · Yeah, SM420 were ALL divorced mounts to the best of my knowledge. I'm looking to eventually go to a Atlas or Lovell T case. bhw dudid ain dtfe vqkzxs msal gaex tigu dkj lopauo