Drivetrain› 4x4 Driveline Components
ATK ENGINES
NEW PRO 231J TRNSFR CASE
SKU: A040 UMT207-5
Moderate — 2–4 hours
Description
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | ATK ENGINES |
| Part Number | A040 UMT207-5 |
Videos
ATK Performance crate engine review
Federated TechTalk #48 - ATK Engines
What Are Crate Engines And Are They Any Good?
Part 2 Jegs ATK Vortec Crate Engine Tear Down
ARE A.T.K. ENGINES AND HEADS ANY GOOD? EVEN MORE GRIEF FROM JEGGS
How to Purchase a Crate Engine
Choosing the Right Crate Engine for Your Project from Summit Racing
ATK Crate Engine Review! Reveal of Our New Chevy 383 Stroker!
ATK review
Chevrolet Performance - SP350/357 Crate Engine - Information & Specs
How To Install SYE Kit On Np 231 Transfer Case 87-06 Jeep Wrangler Tj Xj Lj
NP231C and NP231J Transfer Case Differences
Tera Low 4:1 Transfer Case Install
NV231/NP231 Transfer Case Rebuild Part 1
NP231 transfer case inside neutral,4hi,4lo,2wd explained
Jeep NP231 T-case Wide Chain/6 Pinion Upgrade
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return Policy