FORUM
Sales / Scratch & Dent
XJ / MJ
XJ Cherokee / MJ Comanche
1984–2001
The definitive LS swap parts list for the XJ Cherokee and MJ Comanche — from the people who have done it more than anyone else.
The XJ Cherokee is the most popular Jeep for LS conversions. Compact, lightweight, and with a long history of successful swaps behind it. Novak has been engineering XJ drivetrain solutions since the platform launched. These kits are the distillation of that experience into a single, practical parts list.
Transmission: 4L60E
The core mechanical components - engine mounts, transmission adapter, and the structural hardware that makes the LS engine fit correctly. Everything here must be right before the rest of the swap can happen.
A broader configured kit focused on the systems that make the swap driveable: cooling support, wiring integration, and transmission ancillaries selected for this application.
The fullest configured kit for this application, adding the electronics, tachometer solutions, and finishing components chosen for a more comprehensive conversion.
Click any part name or photo to view its product page. A checkmark means the part is explicitly included in that kit configuration.
| Part | Foundation | Essential | Complete |
|---|---|---|---|
| Adapters | |||
4L61-23
4L60E/4L65/4L70 to NP207/NP231/NP241/NP241OR/NP242/NP249 Adapter, 23-Spline
|
✓ | ✓ | ✓ |
| Cooling | |||
OT6082
Radiator Overflow Tank, 3" x 10", Polished Stainless
|
— | ✓ | ✓ |
K-OC-H7B-N
Auxiliary Transmission Cooler, 30,000 BTU (With Fittings) Northern
|
— | ✓ | ✓ |
TR-FLX
Braided Stainless Auto Trans Cooler Lines, Dual -6AN, 74" OAL
|
— | ✓ | ✓ |
FX3400-X
Electric Fan kit for Jeep XJ/MJ Radiator assembly (Only fits Novak radiator)
|
— | ✓ | ✓ |
K-XJ31H
Jeep XJ/MJ Radiator for LS Gen 3/ Gen 4 Engine swap
|
— | ✓ | ✓ |
| Electrical | |||
E-TXCC
Crank Position and Cruise Emulator for GM Conversions
|
— | ✓ | ✓ |
| Engine Parts | |||
AI4-K
LS Gen III Cold Air Intake Kit
|
— | ✓ | ✓ |
12558346
Plug, EGR block-off, 1997 C5 LS1, 1998-2000 F-body LS1, 1999-2001 Vortec
|
— | ✓ | ✓ |
G3EV1
GM Gen III Intake EVAP Block-Off Plug
|
— | ✓ | ✓ |
2361
GM Oil Level Sensor Plug w/ Sealing Washer (4.5" x 2.2" x 1")
|
— | ✓ | ✓ |
G3EV2
GM Gen III Intake EVAP Relocation Kit
|
— | — | ✓ |
G3VP
Gen III Manifold Adapter Vacuum Port (Power Brake Hose)
|
— | ✓ | ✓ |
G3TC
GM LS Gen III Engine Top Cover
|
— | — | ✓ |
| Exhaust | |||
LSXJ3C
GM Gen III LS V8 XJ/MJ Headers, Silver Ceramic Coated
|
✓ | ✓ | ✓ |
| Fuel | |||
FSK-9704
Jeep XJ/TJ GM Fuel Pump Integration Kit, 1997-2004
|
✓ | ✓ | ✓ |
| Mounts | |||
MMXJ3
Jeep XJ/MJ to LS Gen III/IV Engine Mounts
|
✓ | ✓ | ✓ |
RMU
Jeep Rear Transmission Mount (Polyurethane, Novak Style)
|
✓ | ✓ | ✓ |
MP59
GM P59 ECM Mount Bracket, Steel (Zinc Plated)
|
— | — | ✓ |
| Other | |||
SK2XC
Jeep XJ/TJ/LJ with NP231/NP242 Cable Shifter Kit
|
✓ | ✓ | ✓ |
231MR-2
NP231 Transfer Case Master Rebuild Kit (1994-2006)
|
— | — | ✓ |
231XS
NP231 Slip Yoke Eliminator, Ultra-Short
|
— | — | ✓ |
5202308
231XS Kit Wiring Harness With Plug
|
— | — | ✓ |
These items aren't in the discount kits but are commonly needed for a complete XJ / MJ LS swap.
TR-4L60EL2
4L60E Transmission, Level II, TurnKey
G3EV1
GM Gen III Intake EVAP Block-Off Plug
G3EV2
GM Gen III Intake EVAP Relocation Kit
Transmission: AX15
The core mechanical components - engine mounts, transmission adapter, and the structural hardware that makes the LS engine fit correctly. Everything here must be right before the rest of the swap can happen.
A broader configured kit focused on the systems that make the swap driveable: cooling support, wiring integration, and transmission ancillaries selected for this application.
The fullest configured kit for this application, adding the electronics, tachometer solutions, and finishing components chosen for a more comprehensive conversion.
Click any part name or photo to view its product page. A checkmark means the part is explicitly included in that kit configuration.
| Part | Foundation | Essential | Complete |
|---|---|---|---|
| Adapters | |||
GM621-LS-K
GM Gen III/IV to Muncie/Saginaw Bellhousing, 4-1/16" Bore, 12" Clutch
|
✓ | ✓ | ✓ |
GMAX15
AX15 to GM Bellhousing Adapter (Small Block Chevy & LS)
|
✓ | ✓ | ✓ |
LS400-35X
GM LS Gen III/IV Flywheel, 168T, Offset, 35 lb, for up to 12" Clutch (6 bolt)
|
✓ | ✓ | ✓ |
330-2802
LS Crank Bolts, Extended Length, 11mm x 1.5, Qty 6
|
✓ | ✓ | ✓ |
04-049
GM/Chevy V8 Clutch Kit 11", 10 Spline x 1-1/8"
|
✓ | ✓ | ✓ |
|
910
Bolts, 3/8-16 x 1, hex head, grade 8, black, GM pressure plate, set of 6
|
✓ | ✓ | ✓ |
TB1
Novak Adjustable Throwout Bearing, GM Version
|
✓ | ✓ | ✓ |
PB-6071357
Pilot Bushing, GM Gen III (2001-) to Jeep T14/T15/T18 & AX15 (1992-1999) / NV3550
|
✓ | ✓ | ✓ |
HCRC-34
GM Bellhousing Hydraulic Slave Cylinder Retrofit, 3/4" Bore (Small Block Chevy & LS style)
|
✓ | ✓ | ✓ |
HCR9-K
Stainless Braided Clutch Line, 3AN Female Ends, With Fittings
|
✓ | ✓ | ✓ |
K-HCA-1
Hydraulic Clutch Release Line Adapter, Late Style (TJ)
|
— | — | ✓ |
| Cooling | |||
|
OT6082
Radiator Overflow Tank, 3" x 10", Polished Stainless
|
— | ✓ | ✓ |
|
FX3400-X
Electric Fan kit for Jeep XJ/MJ Radiator assembly (Only fits Novak radiator)
|
— | ✓ | ✓ |
|
K-XJ31H
Jeep XJ/MJ Radiator for LS Gen 3/ Gen 4 Engine swap
|
— | ✓ | ✓ |
| Electrical | |||
|
E-TXCC
Crank Position and Cruise Emulator for GM Conversions
|
— | — | ✓ |
SGI-100BT
Universal Speedometer & Tachometer Signal Interface Module
|
— | ✓ | ✓ |
| Engine Parts | |||
|
AI4-K
LS Gen III Cold Air Intake Kit
|
— | ✓ | ✓ |
|
2361
GM Oil Level Sensor Plug w/ Sealing Washer (4.5" x 2.2" x 1")
|
— | ✓ | ✓ |
|
G3VP
Gen III Manifold Adapter Vacuum Port (Power Brake Hose)
|
— | ✓ | ✓ |
|
G3TC
GM LS Gen III Engine Top Cover
|
— | — | ✓ |
| Exhaust | |||
|
LSXJ3C
GM Gen III LS V8 XJ/MJ Headers, Silver Ceramic Coated
|
— | ✓ | ✓ |
| Fuel | |||
|
FSK-9704
Jeep XJ/TJ GM Fuel Pump Integration Kit, 1997-2004
|
✓ | ✓ | ✓ |
| Mounts | |||
|
MMXJ3
Jeep XJ/MJ to LS Gen III/IV Engine Mounts
|
✓ | ✓ | ✓ |
RMAX15
AX15/NV3550 Universal Adjustable Rear Transmission Mount
|
✓ | ✓ | ✓ |
|
MP59
GM P59 ECM Mount Bracket, Steel (Zinc Plated)
|
— | — | ✓ |
| Other | |||
|
SK2XC
Jeep XJ/TJ/LJ with NP231/NP242 Cable Shifter Kit
|
✓ | ✓ | ✓ |
|
231XS
NP231 Slip Yoke Eliminator, Ultra-Short
|
— | ✓ | ✓ |
|
231MR-2
NP231 Transfer Case Master Rebuild Kit (1994-2006)
|
— | — | ✓ |
|
5202308
231XS Kit Wiring Harness With Plug
|
— | ✓ | ✓ |
TR-AX15
AX15 Manual Transmission, TurnKey, New
|
— | — | ✓ |
These items aren't in the discount kits but are commonly needed for a complete XJ / MJ LS swap.
TR-AX15
AX15 Manual Transmission, TurnKey, New
G3EV1
GM Gen III Intake EVAP Block-Off Plug
G3EV2
GM Gen III Intake EVAP Relocation Kit
K-AX15-ST
AX15 Short Throw Shifter Kit
AX15MR
AX15 Transmission Master Rebuild Kit Deluxe
Built From Actual Swap Experience
The XJ Cherokee / MJ Comanche LS swap has been done hundreds of times by Novak customers and engineers. The parts in this kit are not assembled from a catalog - they're what works, confirmed by the people who have done it.
The Straightforward Answer
The biggest challenge in an LS swap isn't the fabrication - it's knowing what to buy. This kit removes that obstacle. It's Novak's direct answer to the question every builder eventually asks: "What do I actually need?"
Component Links to Expert Guidance
Every part links to its own product page with detailed specifications, application notes, and engineering documentation. You're not just buying parts - you're buying access to the knowledge behind them.
Three Tiers for Every Budget
Not every builder wants to do the full conversion in one shot. The Foundation tier lets you start with the mechanical core and add systems as your build progresses. The Complete tier ensures nothing is missed on a ground-up swap.