Truck / SUV
Jeep®
Restoration
Stock Replacement
Late Model Muscle
Tools
Gifts, Clothing, & More
Circle Track
Street Rod
Powersports
Paint & Body
Marine
Jr Dragster
Availability
Advance Adapters Transmission & Drivetrain Parts
Swapping around engines and transmissions is easier with tough, dependable components from Advance Adapters. The company started in 1971 with a single adapter, mating...
Swapping around engines and transmissions is easier with tough, dependable components from Advance Adapters. The company started in 1971 with a single adapter, mating a Muncie car 4-speed to a Jeep Dana 18 transfer case. Today, that selection has grown to keep pace with the popularity of off-roading and rock crawling, with parts like the NP231 SYE (slip yoke eliminator), adapter bellhousings, conversion clutches, and output shafts. Advance Adapters engineers motor mount kits and headers to support a wide variety of popular engine swaps, plus components like oils pans, radiators, and filter relocation kits to finish your...
Swapping around engines and transmissions is easier with tough, dependable components from Advance Adapters. The company started in 1971 with a single adapter, mating a Muncie car 4-speed to a Jeep Dana 18 transfer case. Today, that selection has grown to keep pace with the popularity of off-roading and rock crawling, with parts like the NP231 SYE (slip yoke eliminator), adapter bellhousings, conversion clutches, and output shafts. Advance Adapters engineers motor mount kits and headers to support a wide variety of popular engine swaps, plus components like oils pans, radiators, and filter relocation kits to finish your swap. Summit Racing carries trail-tested Advance Adapters products, like low-gear transfer cases, twin-stick shifters, and Jeep crossmembers and adapters.
Fixed Yoke Kit, with Vacuum Actuation for Front Hubs, Fits Jeep, NP 231, Uses 1310 U Joint, Kit
Part Number: ADD-50-7906
Estimated Ship Date: Today
Estimated Ship Date: Today
Estimated Ship Date: Today
Shifter Bracket, Transfer Case Mount, Steel, Jeep, Kit
Part Number: ADD-715542
Estimated Ship Date: Today
Estimated Ship Date: Today
Transfer Case Components, NP231 27-Spline Input Gears, Each
Part Number: ADD-716202
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
SHIFTER COMPONENTS, MISCELLANEOUS PARTS & ACCESSORIES: *23T NP231 T/C INPUT GEAR (Flush)
Part Number: ADD-716053
Not Yet Reviewed
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
Input Gear, Transfer Case, Atlas, NP231, 27-Spline, Each
Part Number: ADD-305027
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Input Gear, 29-spline, Front Input Bearing, Needle Bearings, New Process 231, Kit
Part Number: ADD-50-0231
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Shifter Bracket NP 231 T/C (1063)
Part Number: ADD-715523
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, 4L60E Transmission, NP231 Transfer Case, Kit
Part Number: ADD-50-0402
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Mounts, NP231, Universal, Pair
Part Number: ADD-716008
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Transfer Case Adapter Kit *4L60E HEX TO NP231 21 SPL.
Part Number: ADD-50-0431
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, TH400 Transmission, NP231 23-Spline Transfer Case, Kit
Part Number: ADD-50-6402
Not Yet Reviewed
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
*NV3550 TO NP231 ADAPTER KIT
Part Number: ADD-27-3510AA
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, TH350 Transmission, NP231 21-Spline Upgrade to 23-Spline, Transfer Case, Kit
Part Number: ADD-50-6801
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter Kit DODGE NV4500/NP231 23TH KIT
Part Number: ADD-50-0204
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, TH350 Transmission, NP231 Transfer Case, 1987-1994, 23 Spline, Kit
Part Number: ADD-50-6305
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, Mopar, Torque Command Transmission, NP231 29-Spline Transfer Case, Kit
Part Number: ADD-27-0011T
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, New Venture 4500 Trasmission, NP231 Transfer Case, Kit
Part Number: ADD-50-0212
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, TH350 Transmission, NP231 Transfer Case, Kit
Part Number: ADD-50-6805
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, 700R4/4L60 Transmission, NP231 21-Spline Transfer Case, 1995 and Newer, 23 Spl, Kit
Part Number: ADD-50-9103A
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
Transfer Case Adapter, GM, TH350 Transmission, NP231 23-Spline Transfer Case, Kit
Part Number: ADD-50-6802
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
INPUT GEAR-29T ATLAS 4 SP ALSO NP231 T/C
Part Number: ADD-305029
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
INPUT GEAR-23T SHORT 4.2 ATLAS 4 SP ALSO NP231 T/C
Part Number: ADD-305023S
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
INPUT GEAR-23T ATLAS 4 SP ALSO NP231 T/C
Part Number: ADD-305023
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
INPUT GEAR-23T LONG ATLAS 4 SP ALSO NP231 T/C
Part Number: ADD-305023L
Not Yet Reviewed
Estimated Ship Date: Jun 30, 2026 if ordered today
Estimated Ship Date: Jun 30, 2026 if ordered today
